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Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission.

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Old 09-30-2008, 03:41 PM   #1 (permalink)
jenrichblue
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Join Date: Oct 2004
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Recommendations on Allison Problems and Service

All - I am addicted to this forum as I am usually able to answer my questions without having to post them (the answer is already available by searching!) However I am having some difficulties with my truck and I haven't been able to find anything specific and I wanted to solicit some advice (especially from those in the 'know' on the Allison trans!)

Vehicle: '03 2500HD LB7 w/Allison, approx. 95,000 miles, Edge programmer w/Attitude, 4" exhaust system, 285/75/16 tires, Running Mobil 1 Synthetic ATF in the trans currently.

History: Truck has overall been reliable. I have had the normal issues...cluster problems, injector issues, dash lights, front hub failures, etc., but nothing that couldn't be worked through. Lately, I have noticed the transmission temp tends to run on the hotter side than I would like. I run my Edge on level 3 normally, but I religiously drop this down to level 2 whenever I am towing a trailer (approximately 10K pounds) which happens 6-10 times per year. My buddy who always accompanies me on my trips to the desert, states that his Allison gets to about 180 max whether he is towing or not. Mine will get to 180 around town (quickly) and well above 220 when towing. On two separate occasions now I have limped the transmission when attempting to pull a small boat trailer out of the water in low traction conditions. This happens on a sandy beach and once the truck starts to dig down we shut it off and pull it out with another truck.

The codes that it pulls is P0700 (TCM) and P0773 (Solenoid E). I can clear these codes and it operates just fine

Two other things that I want to mention. Before I converted to Mobil 1 (about a year ago) I had the transmission serviced at the dealer and I think that they overfilled it. On my next trip to the desert, I noticed a fair amount of tranny fluid underneath the truck that apparently came out of the vent. When I checked the level it was still within spec so I believe that the fluid expanded and puked out but was otherwise fine. That ended my plans of having the dealer service my truck as I will do that myself from now on! The second issue is related to my gear indicator on the dash which is completely blank now and doesn't even show the "PRNDL21". For awhile there it was getting very dim, but would sometimes be readable after driving the truck for some time. Now it is just dead and never comes back. I thought that this might be related to the NSBU problems, but not certain.

Here is what I am thinking about doing, and I am hoping that someone can advise on whether this sounds like a fair approach. I don't really want to waste a lot of money going down this path if I am only going to end up yanking the transmission to replace the TC or something simliar:
  • Visually inspect connections at TCM and clean if necessary.
  • Drain the fluid and replace both the external and internal filter.
  • Visually check connections to E solenoid (?)
  • Check for burnt fluid or particles in the transmission pan and/or filter.
  • Install the larger pan from Allison (using the longer internal filter.)
  • Exchange the fluid using the Hoot method described on this forum.
  • Switch to Mobil Deval synthetic.
  • Replace the NSBU switch.
I am guessing that this will cost me somewhere around ~$400 to do myself, so it's not like a cheap solution. I would hate to go this route and end up throwing a code again and then dumping $200 in synthetic fluid down the drain!

Thanks in advance for the help! Sorry for the long post...just wanted to be thorough.

Regards,

Eric

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'03 2500HD LT D/A - Victory Red w/Charcoal Leather and Dual Invision Headrest Monitors
------------------------------------------------
Edge Juice w/Attitude, Rancho RS9000 shocks, Custom rear air bags with compressor and tank, 4" Exhaust w/o Catalytic (why bother...just gets in the way of the black smoke!)
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Old 10-03-2008, 02:30 PM   #2 (permalink)
jenrichblue
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Join Date: Oct 2004
Location: Simi Valley, California
Posts: 11
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Did I scare everyone away?! Lol

Wondering if I scared everyone away by my long post!

I know that there is a lot of Allison expertise on this website...just wondering where it's hiding at?

Thanks

Eric

__________________
'03 2500HD LT D/A - Victory Red w/Charcoal Leather and Dual Invision Headrest Monitors
------------------------------------------------
Edge Juice w/Attitude, Rancho RS9000 shocks, Custom rear air bags with compressor and tank, 4" Exhaust w/o Catalytic (why bother...just gets in the way of the black smoke!)
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