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Old 11-13-2008, 07:13 PM   #1 (permalink)
Chevy_Duramax_Man
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Changing Transmission fluid in 02 duramax/Allison

Well my Allison has been acting up it threw codes PO700 and PO735 (truck has 69,XXXmiles). I pulled the spin on filter today and the fluid has most definitely been hot. It has a very dark color verse's new fluid. The question is: What fluid should I go with? How much fluid do I need? Should I change the internal filter? Should I go about the HOOT method? Open to any recommendations.

I am really concerned about the life left in the transmission, when the codes came on the tranny slipped real bad, it was 4th to 5th and it would not shift into 5 until I pulled over and turned it off then on.

My last service was at 57,000 miles and was on 2-17-07. The truck has only 12,000 miles since the service. The dealer did the service as it was in to put copper washers on the torque coverter due to an excessive leak. On the work order it says that Filter ASM (04197-CT) PN 29539579 was installed, is this the internal filter? I also found that the dealer had not replaced the magnet on the filter, therefore this whole time it has not had the magnet. Not sure if this could have caused any problem but a magnet is going back on now.

Please help me as I am very concerned! Thanks!!
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2002 Chevy Duramax CCLB: Torsion bars cranked, 20 inch wheels with Nitto Grappler tires, k+n drop in filter, Edge Juice with attitude, straight pipe'd.

Last edited by Chevy_Duramax_Man; 11-13-2008 at 07:13 PM.
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Old 11-13-2008, 09:13 PM   #2 (permalink)
Chevy_Duramax_Man
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The new vs. old fluid...
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CCSB LBZ: Rancho lift, 20's with 325/60's, MBRP 4 inch straight exhaust, MBRP downpipe, ppe standard, airaid intake, PCV re-route, EGR blocked, AirDog DF 165-II, Mag-Hytec rear Diff pan, Painted to match escalade handles, Viper 2-way with autostart, custom grille.

2002 Chevy Duramax CCLB: Torsion bars cranked, 20 inch wheels with Nitto Grappler tires, k+n drop in filter, Edge Juice with attitude, straight pipe'd.
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Old 11-14-2008, 02:20 AM   #3 (permalink)
jake111
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Whatever Dexron III ATF that came in these when new (maybe somebody else remembers the brand) is notorius for turning dark, and/or it may have something to do with how the Allison affects the ATF. It's disturbing because most of us are use to the ATF looking like new almost forever. So if it doesn't smell bad/burnt and you haven't overheated it (say, over 250*F for "awhile"), then just dark is ok.

For 2002, stay with a Dexron III (not VI), or TES-295 (like Transynd). Transynd is probably best, with other look-alikes probably just as good. Personally, I used Mobil 1 Synthetic ATF (Mercon/Dexron "for older GM vehicles" because there are licensing issues that keep them from saying Dexron III).

Lots of people have flushed with the Hoot method. If you feel strongly about a complete change, this is the way to go.

Some of us just do a drain/fill with a change of the external filter, which swaps about half of the fluid. Then do it a couple more times and most of it has been effectively changed. Or wait 5/10/20/whatever thousand miles and then change it again. It's up to you!
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Old 11-14-2008, 12:23 PM   #4 (permalink)
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Quote:
Originally Posted by Chevy_Duramax_Man View Post

The new vs. old fluid...

IMHO that fluid looks fine to me. They all tend to change color even though they arent burnt up. Most new tranny fluids its hard to tell by color alone. As long as it smells fine I wouldnt worry about it.
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Old 11-14-2008, 01:42 PM   #5 (permalink)
Mike L.
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I wouldn't waste my money on expensive fluid at this point.
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Old 11-14-2008, 02:02 PM   #6 (permalink)
Chevy_Duramax_Man
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I already dropped the fluid/pan/internal filter. I am going with torque-drive synthetic Amsoil. Does anybody know if the pan gasket is reusable? I assume it is.
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2002 Chevy Duramax CCLB: Torsion bars cranked, 20 inch wheels with Nitto Grappler tires, k+n drop in filter, Edge Juice with attitude, straight pipe'd.
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Old 11-14-2008, 03:14 PM   #7 (permalink)
DURAtotheMAX
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Quote:
Originally Posted by Chevy_Duramax_Man View Post
Does anybody know if the pan gasket is reusable? I assume it is.

yes
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big thanks to...Eric @ Merchant Auto, Mike @ Inglewood Transmission, Guy @ SoCal Diesel, IdahoRob, Tim @ St. Joseph Diesel, RickDLance, McRat/team salad, BigDipper, Nathan @ MPI, Bobo/team twisted, Fingers, Tony @ RidgeRunner Diesel, EFILive
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Old 11-14-2008, 05:17 PM   #8 (permalink)
kgt
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Lots of info in the service manual about the fluid getting dark and not to worry about, looks like fluid out of a ally to me, color is kinda goig by the way side in some ways as far as for whats going on in modern tranny's, more important is the smell as Ben has already said.
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Old 11-14-2008, 06:05 PM   #9 (permalink)
allisondan
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Quote:
Originally Posted by Mike L. View Post
I wouldn't waste my money on expensive fluid at this point.
I agree. It would be different if you just rebuilt it but, dexron will work just fine until you are at that point. Save you money and put it to good use.
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Old 11-15-2008, 12:25 PM   #10 (permalink)
Chevy_Duramax_Man
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Well I changed out the fluid, filters and did the HOOT method. I just got back from a drive and everything acted perfect!! I just set the Edge at level 2 (where it will stay) and it acted perfect. Lets hope that I caught it before really severe damage was done. This summer I see a suncoast coming my way!!
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CCSB LBZ: Rancho lift, 20's with 325/60's, MBRP 4 inch straight exhaust, MBRP downpipe, ppe standard, airaid intake, PCV re-route, EGR blocked, AirDog DF 165-II, Mag-Hytec rear Diff pan, Painted to match escalade handles, Viper 2-way with autostart, custom grille.

2002 Chevy Duramax CCLB: Torsion bars cranked, 20 inch wheels with Nitto Grappler tires, k+n drop in filter, Edge Juice with attitude, straight pipe'd.
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