Home Resources Forums Nationals Meets Store
07/27/14 11:25 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Welcome to the Chevy Avalanche Fan Club of North America

Become a Supporting Member

Visit the CAFCNA General Store

 
   Home   Help Search Login Register Bookmark  
Advertisement
Put your advertisement image here...


Advertisement
 
Pages: [1] 2  All   Go Down
  Print  
Author Topic: Changing Transmission Fluid After 100K Miles  (Read 10913 times)
0 Members and 1 Guest are viewing this topic.
03Z71Yellow
Member
**
Offline Offline

Posts: 11

2003 Z71 1500 Yellow


Awards
« on: 08/25/11 01:27 AM »

I've got about 101K miles on my 03 Z71.  The transmission fluid has never been changed.  I was going to do this as part of my 100K mile maintenance.  I've heard from several people that if I've not had my fluid changed periodically up until now, I'm better off leaving the old stuff in.  Can anyone share some thoughts on both leaving as is and replacing?
Logged

I am new to the site.  I own a 2003 Yellow Z71.  Reading through the posted resources, apparently I have somewhat of a collectors item, as my avalanche does not have the side cladding.
gopherbacon
Full Member
****
Offline Offline

Posts: 521


mmm bacon


Awards
« Reply #1 on: 08/25/11 01:40 AM »

tagging this post as i'm also interested in feedback.  I bought my truck with 113k on the clock, and have no idea if the original owner kept the tranny flushed periodically.. 
Logged

04 Avalanche 2500, replaced with..
06 Avalanche 2500, DGM
06 Audi A3, Red, replaced with..
07 Audi S6, Silver, V10 powah
95 Isuzu Rodeo, Green.. the new project
08 Kawasaki Ninja 650R, Black
02 Northface
CAFCNA 2011 Supporting Member
Full Member
*
Offline Offline

Posts: 201


Don't mess with Kono


Awards
« Reply #2 on: 08/25/11 02:18 AM »

Oils are oils and all oils break down over time.
Oils in good condition also aid in prolonging various seals and gaskets.
The only reason for not changing your fluid is if you are going to divest yourself of the Av.
If you are going to keep the Av for a long time ~100K is a good time to flush and change the transmission fluid.
I let my transmission go to 125,000 and an evaluative check of the fluid indicated it was no longer in good condition.
You might also look into other service - diff's, radiator fluid, etc.
Expensive, yes, but being proactive helps push eventual repairs out to higher mileages.
Logged

Location: Mesa, Arizona
2002 - the 1st, the best ! Body Armor Rocks !!
2002 Northface, 1 of 10,262
Mdz66
Full Member
*****
Offline Offline

Posts: 1,114


I love my 1st and only Z-66 Avalanche!


Awards
« Reply #3 on: 08/25/11 02:53 AM »

100k on any transfluid is a lot, don't be surprized to find the black nasty slime on the bottom of the pan.   I would not have it flushed with that many miles as some flush machines force fluild places and directions it normally doesn't go and my stir up debris and push it where it shouldn't be.   Even if you drop the pan install new filter and refill the color will not be much different as you are only changing 1/3 of the fluid but it is better doing nothing.   I pull the drain plug on mine every time I change the engine oil and pour in 3 3/4 quarts and replace the filter every 30k and at 77k my trans shifts better than new.  I also use dexron 6.   Good luck
Logged


02 Forest Green Z-66, Medium Cloth, Grille Gaurd, K&N Cold Air Kit, Gibson Stainless Sport Truck Cat-Back, Tube Side Steps, Silver Stars , Full-Time Amber Drls, 10In Flip Down Monitor, Bose Dvd, Green Underbody Kit, Functional Ram Air Hood, Forest, Green Bowtie, Billet Grill, Mountain Decal In Back Window,  Red Brake Calipers, Aux Tranny Cooler, D&S Rotors
ltxi
CAFCNA 2014 Supporting Member
Full Member
*
*
*
*
*
*
*
*
Offline Offline

Posts: 2,344


...tree art...


Awards
« Reply #4 on: 08/25/11 09:42 AM »

I would definitely change it and consider having it forward flushed. Never back flush a transmission for the reasons just noticed. Imo, whoever invented that concept is a masochist or in the business of selling tranny rebuilds....or both.
Logged

2008 Z71 Avalanche LT3 4x4 4:10 Ebony/Black - Nelson tuned
Av-n-Taz
CAFCNA 2005 Supporting Member
Full Member
*
Offline Offline

Posts: 1,870


Taz, my AV co-pilot. Member 9440


Awards
« Reply #5 on: 08/25/11 01:59 PM »

Do the torque converters have drain plugs, these days?

EJ
Logged

02 SOM Z71, FTADRL's/Turn, All6onHi w/50W Fogs, 4 brake lights, VRStainless Straps, “poor man’s LOF”, Hypertech PPIII, Taylor TV50s, EZ Bedslide, DE-Amp Bypass, Leveling keys. FlowMaster 70 Series, "Vette" servo, trailer wiring outlet moved to bumper.
BlueZ71
Full Member
***
Offline Offline

Posts: 225

BRING IT ON!


Awards
« Reply #6 on: 09/26/11 08:25 AM »

Did a drain and fill via the drain plug at 30k miles, and did a filter change at 100k miles, both times it looked great.

Change it.
Logged

Second place is just the first loser!
RayC
Full Member
***
Offline Offline

Posts: 38


Awards
« Reply #7 on: 02/27/12 09:44 PM »

                               The manual recomends 100,000 miles. My fluid was burnt @ 50k. The fluid must withstand alot of heat, which causes the fluid to get burnt.New fluid will aid the clutches and disc.I would replace sooner if needed. A fluid change or fluid and filter change are ALOT cheaper than a new transmission.
Logged

2005 Black LT 4X4,Leather,Bose,Navigation,Ambers,Tinted Front Windows.
Nitrousbird
Full Member
***
Offline Offline

Posts: 82


Awards
« Reply #8 on: 03/27/12 04:19 PM »

I'm on the fence about this as well.

141k on the clock, bought her with 68k.  Not sure if it was ever changed by the previous owner(s), but I know I've never changed it.  Has had a large aftermarket tranny cooler on it since I purchased it.  Since about 135k, I've reprogrammed the tranny slightly with HP Tuners...I didn't change any line pressures, but just increased some shift speeds and made some minor tweaks on how long it will hold a gear in the towing mode, as some of the factory settings have annoyed me a lot ever since owning it.

Tranny doesn't slip or have any issues whatsoever - and never has.  Fluid is still pretty red.  I've probably added 2-3 quarts to it since I owned it (about 1 when I did the cooler, another 2 from a leaky hose clamp I repaired).   

I fear changing the fluid will just cause me issues.  I tow short distances with it very often in the summer (around 5000lbs), longer distances once in a great while.

I just can't decide of which gamble to take - the leave it alone gamble or change the fluid gamble.  I wouldn't do a flush, but rather pull the pan (clean it + new filter), then pull the output of the tranny cooler hose and fill new fluid in the dipstick tube as old fluid comes out the cooler method.  I would love to NOT spend money on a new tranny this year. 
Logged

02 Avalanche North Face Edition - Sirius Sporster 5, Prodigy brake controller, GMT900 brake upgrade w/ EBC Yellow stuff all around and Summit cross drilled/slotted rotors, braided lines, MSD Wires, TR55GP plugs, K&N Filter, Premier 980BT, Eclipse XA1000, 2 Kicker 10's under rear seat, Kicker components front/Infinity rear.

94 Firebird Formula - very not stock; currently a project car.

01 Malibu Sunsetter VLX- LS1 powered and our favorite toy, lots of mods.
jimmypsp700
Full Member
***
Offline Offline

Posts: 311


2004 Chevy Avalanche Z71 1500


WWW Awards
« Reply #9 on: 03/27/12 06:44 PM »

I did mine with over 100k and its fine now at 146k.
I wouldn't just do a flush and fill but also drop the pan and replace filter and as much fluid as possible
.
Logged

'04 Chevy Av Z71 1500
'90 Chevy Vette L98 TPI
'10 Polaris Sportsman 850XP EPS
'00 Polaris Scrambler 400 2x4
'02 Triton SL8 ATV Trailer
'94 Sierra 32' TT
woyster_07avy
Full Member
***
Offline Offline

Posts: 48


Awards
« Reply #10 on: 03/29/12 05:00 AM »

Do the 2007 up Avalanches come with a plug in the pan for each draining?  I've got 75,000 miles on mine and have been wanting to drop the pan and replace the filter.  A drain plug would make it a much easier job.  Also, what filter should be used?  Any tricks/tips to dropping the pan?  Any other areas fluid could be drained from to get more fluid changed out?  I have had nothing but problems when flushing past vehicles.

Thanks.
Logged

2007 Victory Red Chevrolet Avalanche LT
Vortec 5.3L FlexFuel V-8, 275/55R20 Cooper Zeon LTZ Tires on 20x9 Ballistic Jester Wheels, Tinted Windows (35% front, 5% over factory rear, 20% over factory back), Black Painted Grille, Custom Painted Bowties, JVC HD Radio, Overhead Audiovox DVD Player

Other vehicles/toys:
2013 Inferno Orange Metallic Chevrolet Camaro 2SS/RS
2005 Kawasaki STX 15F
2001 Seadoo GTX
rvincent84
Full Member
***
Offline Offline

Posts: 34


No replacement for displacement...


Awards
« Reply #11 on: 03/29/12 07:35 AM »

I too have this issue. Just purchased my 03 2500 with 103,000 on it and of course came with no service records. Thinking bout just draining as much fluid as possible n replacing filter. Curious if the filter comes out quite easily. Once on my 94 fullsize blazer I tried to replace filter but could not get the plastic gasket piece that went over inlet neck out of housing. So i left it in and jus put new filter in....tranny went about 3000 miles later and found the filter floating in pan! Obviously I've learned from younger less knowledgeable mistakes. So does anybody know about the filters in the 4l80e???
Logged

03 2500 dark grey metallic, loaded. Front leveling kit, 285 Fstone Destination M/Ts. Amber drls, k&n 77 CAI, Bullydog GT tuned, Flowmaster duals w/ 4" SS tips, throttle body spacer.
pwtr02ss
Full Member
***
Offline Offline

Posts: 158



Awards
« Reply #12 on: 03/29/12 07:48 AM »

Do the 2007 up Avalanches come with a plug in the pan for each draining?  I've got 75,000 miles on mine and have been wanting to drop the pan and replace the filter.  A drain plug would make it a much easier job.  Also, what filter should be used?  Any tricks/tips to dropping the pan?  Any other areas fluid could be drained from to get more fluid changed out?  I have had nothing but problems when flushing past vehicles.

Thanks.

My 08 didn't have a drain plug. I'm a firm believer in 50k mile trans fluid changes though. My truck just clicked 100k and I serviced it and transfer case. I let the t-case go 100k and will never do that again, it was completely black. Those of you who have let it go to long, I would just drop the pan and get all the gunk out, do a filter change and fill it back up. Transmission flushes are not recommend. I have seen several cars not move after a fluid flush and change.
Logged

2008 Avalanche LTZ- All options
2002 Camaro SS- Heads, Cam, Forged Internals, Nitrous, Bla Bla Bla
1996 S-10- Lowered 5/5, Boyd Coddington Billets, Custom Paint, Daily Driver
1974 C-10- Lowered 5/5, Bonspeed Billets, 08 LSX Swap, Full Frame Off Build
www.bargerandsons.com (Like this page!!!!)
www.installuniversity.com
Wazbro
Full Member
****
Offline Offline

Posts: 970


I love the Chevy Avalanche


Awards
« Reply #13 on: 03/29/12 02:34 PM »

Do the 2007 up Avalanches come with a plug in the pan for each draining?  I've got 75,000 miles on mine and have been wanting to drop the pan and replace the filter.  A drain plug would make it a much easier job.  Also, what filter should be used?  Any tricks/tips to dropping the pan?  Any other areas fluid could be drained from to get more fluid changed out?  I have had nothing but problems when flushing past vehicles.

Thanks.

I have a Mityvac 7201 Fluid Evacuator Plus for changing the oil on my Mercedes and it works great for sucking the trans fluid out of the dipstick tube as well.

http://www.amazon.com/Mityvac-7201-Fluid-Evacuator-Plus/dp/B0002SR7TC/ref=sr_1_7?ie=UTF8&qid=1333056649&sr=8-7
Logged

2008 AV 6.0L LT3 Autoride Blue Granite Metallic
jimmypsp700
Full Member
***
Offline Offline

Posts: 311


2004 Chevy Avalanche Z71 1500


WWW Awards
« Reply #14 on: 03/29/12 08:55 PM »

My 2004 wasn't supposed to have a drain plug but it does. 
The parts counter will know what filter kit is required.
Logged

'04 Chevy Av Z71 1500
'90 Chevy Vette L98 TPI
'10 Polaris Sportsman 850XP EPS
'00 Polaris Scrambler 400 2x4
'02 Triton SL8 ATV Trailer
'94 Sierra 32' TT
slagfest
Full Member
***
Offline Offline

Posts: 136



Awards
« Reply #15 on: 04/01/12 05:25 PM »

ive found that if you have alot of miles its safe to do a filter change then within do a flush. introducing bran new fluid to an old tranny usually causes leaks. Filter adds some new and if you have no leaks try the flush or do a drop and fill
Logged
woyster_07avy
Full Member
***
Offline Offline

Posts: 48


Awards
« Reply #16 on: 04/01/12 05:45 PM »

This weeked I changed the filter in mine. Just over 75000 miles and the fluid still looked very good. I used a small vacuum with hose stuck down the fill tube and was able to suck about 2 qts out before dropping the pan...didn't spill a drop till the pan hit the exhaust and I dumped the contents all over the garage floor! I plan on getting a smaller hose and using the vacuum to pull out and replace fluid every oil change from now on.
Logged

2007 Victory Red Chevrolet Avalanche LT
Vortec 5.3L FlexFuel V-8, 275/55R20 Cooper Zeon LTZ Tires on 20x9 Ballistic Jester Wheels, Tinted Windows (35% front, 5% over factory rear, 20% over factory back), Black Painted Grille, Custom Painted Bowties, JVC HD Radio, Overhead Audiovox DVD Player

Other vehicles/toys:
2013 Inferno Orange Metallic Chevrolet Camaro 2SS/RS
2005 Kawasaki STX 15F
2001 Seadoo GTX
mavericknj
CAFCNA 2014 Premium Member
Full Member
*
*
*
Offline Offline

Posts: 143


As the Avy goes rolling along


Awards
« Reply #17 on: 04/01/12 07:38 PM »

50 to 75k is the suggested interval for trans service with filter change.  It depends on how hard you drive your vehicle and under what conditions. It is highly recommended for those of us not mechanically inclined or have a full service bay at the homestead. As I have learned over the years, take care your equipment and it will take care of you.
Logged

03, Z71, Black, Sunroof, Custom Pioneer HU, DVD, Bose Stereo (w/rear ent), Leather/Pwr Seats, Pewter Gray Interior, K&N Air Filter, Edge Evolution (CTS), WeatherTech Vent Shades, 17 Rims, WeatherTech Floor Mats,
Shanes 02 Avalanche
Full Member
******
Offline Offline

Posts: 3,076


Teach your children well, they are the future.


WWW Awards
« Reply #18 on: 04/13/12 10:46 AM »

I have changed mine 4 times in 189k miles. This has kept my tranny running good. After the last change my tranny showed very little wear and nothing beyond normal. But remember if it says change every 75k I will go 50-60k. I change my Syn oil every 3-4k instead of 5-7k. I don't mind spending a little extra to save a lot in the future.
Logged

You cannot help the poor by destroying the rich.
You cannot strengthen the weak by weakening the strong.
You cannot bring about prosperity by discouraging thrift.
You cannot lift the wage earner up by pulling the wage payer down.
You cannot further the brotherhood of man by inciting class hatred.
You cannot build character and courage by taking away people's initiative and independence.
You cannot help people permanently by doing for them, what they could and should do for themselves.
.....Abr
PerfectReign
CAFCNA 2013 Supporting Member
Full Member
*
*
*
*
*
Offline Offline

Posts: 1,720


A Turn Signal is a Statement, Not a Request


WWW Awards
« Reply #19 on: 04/13/12 12:44 PM »

So far, I've changed mine three times in 106K miles. I plan to do the next one in May before the summer heat begins.
Logged

2006 WBH LS2000 Volkswagen Jetta TDI
Stefan N
Full Member
***
Offline Offline

Posts: 86


Awards
« Reply #20 on: 05/21/12 05:33 PM »

I change my tranny oil and filter (5quarts) everytime i change engine oil  chevy
Logged

2008 LT3 Z71, 3,73, Black leather seats. Location SWEDEN!
mavericknj
CAFCNA 2014 Premium Member
Full Member
*
*
*
Offline Offline

Posts: 143


As the Avy goes rolling along


Awards
« Reply #21 on: 05/23/12 10:45 AM »

Now is the perfect time to have it done. You rather know now, then find out later. If you are worried, then take to a transmission service for have them check it out.
Logged

03, Z71, Black, Sunroof, Custom Pioneer HU, DVD, Bose Stereo (w/rear ent), Leather/Pwr Seats, Pewter Gray Interior, K&N Air Filter, Edge Evolution (CTS), WeatherTech Vent Shades, 17 Rims, WeatherTech Floor Mats,
Rewind
Full Member
***
Offline Offline

Posts: 193



Awards
« Reply #22 on: 05/23/12 10:48 AM »

We just bought our Av with 130k on it, aparently it hasn't been changed so I'm going to have a flush done on it. I guess they should change the filter too.
Logged

2005 Silver Birch Metallic WBH 2WD LT Z66 traded for
2007 Sunburst Orange Metallic WBH 4WD LTZ
PerfectReign
CAFCNA 2013 Supporting Member
Full Member
*
*
*
*
*
Offline Offline

Posts: 1,720


A Turn Signal is a Statement, Not a Request


WWW Awards
« Reply #23 on: 05/23/12 11:13 AM »

We just bought our Av with 130k on it, aparently it hasn't been changed so I'm going to have a flush done on it. I guess they should change the filter too.
I have heard (only here say) that flushing the tranny may cause a host of other issues if it is done for the first time at a high mileage.

From what i understand, flushing MAY dislodge particles that have been resting in the fluid and place them in inappropriate areas.

It is recommended you drop the pan and change the fluid from there.
Logged

2006 WBH LS2000 Volkswagen Jetta TDI
Rewind
Full Member
***
Offline Offline

Posts: 193



Awards
« Reply #24 on: 05/23/12 01:34 PM »

I've heard that too. Just wasn't sure which I should do.

So just draining and doing a filter change will be ok?
Logged

2005 Silver Birch Metallic WBH 2WD LT Z66 traded for
2007 Sunburst Orange Metallic WBH 4WD LTZ
Pages: [1] 2  All   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2011, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.083 seconds with 25 queries.
Official SEMA Member ChevyAvalancheFanClub website are the rightful owners as indicated in the ALT TXT tags provided.  Chevrolet, Chevy, Avalanche, PRO-TEC, PASSlock, Midgate, the Chevrolet bowtie logo, Avalanche logo, and their images are registered trademarks of the General Motors Corporation and are used with kind permission as approved by Chevrolet Public Relations, Chevrolet Brand Management, and the Chevrolet Legal Department (thanks Chevrolet!).  OnStar and it's logo are the property of OnStar.  XM, XM Radio, and the XM logo are property of XM Radio.  I'm just a little guy so don't even think about suing me.  It's recommended you read the Privacy Policy and Terms of Use of this website.  The Chevrolet Avalanche Fan Club of North America is a proud member of SEMA, the Specialty Equipment Market Association.  All content appearing on this is protected under international copyright ©, 2002 to 2008, All Rights Reserved