Duramax Diesels Forum Truck of the Week
  #1  
Old 08-01-2011, 05:13 PM
cb197cj5 cb197cj5 is offline
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Default allison transmission Codes P0729, P0735, P02723

I have a 2006 Duramax with the Allison in it. I got a call from the shop today that the transmission had the codes P0729, P0735 and P2723. I ran it for the first 80,000 miles and one of my salesmen has taken it to 120,000. What caused a 5th and 6th gear sync problem on a non chipped stock truck? I did put 265 tires on it. . .That is the only modification from stock. If I do have to put a new transmission in it, what aftermarket beef up parts should I put in to stop this from happening again?

Last edited by cb197cj5; 08-01-2011 at 05:40 PM. Reason: typo in third code
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Old 08-01-2011, 05:22 PM
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I think you have a typo in your 3rd code
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Old 08-01-2011, 05:40 PM
cb197cj5 cb197cj5 is offline
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OOPS P2723 oil pressure in the transmission.
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Old 08-01-2011, 07:52 PM
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Speed sensor problem is where I would look first. P0729 is 6th gear incorrect ration, p0735 is 5th gear incorrect ratio. P2723 is a tie up. ( 2 gears at once ) transfercase is the next step after speed sensors.
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Old 08-02-2011, 07:05 AM
cb197cj5 cb197cj5 is offline
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Thanks MikeL transfer case wins the prize. The bushing that goes around the yoke coming out of the Tcase to the front of the drive shaft has been spit out. Just a transfer case rebuild? Any one make beefed up tranfer case kits?
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Old 08-02-2011, 08:42 AM
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Might as well put a pump rub kit in it while you have it open.

http://www.merchant-automotive.com/t...grade-kit.aspx
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Old 08-02-2011, 08:49 AM
cb197cj5 cb197cj5 is offline
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Thanks. I guess only the transfer case is bad then? Transmission should be okay?
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Old 08-02-2011, 09:54 AM
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Quote:
Originally Posted by cb197cj5 View Post
Thanks. I guess only the transfer case is bad then? Transmission should be okay?
Fix the TC first and see where that gets you. One step at a time.
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