Duramax Diesels Forum Truck of the Week
  #1  
Old 08-01-2011, 06:13 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 06:40 PM. Reason: typo in third code
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Old 08-01-2011, 06:22 PM
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I think you have a typo in your 3rd code
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Old 08-01-2011, 06:40 PM
cb197cj5 cb197cj5 is offline
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OOPS P2723 oil pressure in the transmission.
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Old 08-01-2011, 08:52 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, 08:05 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, 09:42 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, 09:49 AM
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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, 10:54 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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Old 02-18-2015, 02:06 PM
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Quote:
Originally Posted by greenduramax View Post
Ok guys needin help.....i have an 03 duramax with the 5 speed allison....ive had a chip on it since ive had it no problems....recently i changed the oil in the transmission all of a sudden it started throwin 0700 and 0735 and limpin 5th...pull the chip off its fine! Whats goin on?
You beat the snot out of it. Probably burnt clutches.
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Old 02-18-2015, 06:00 PM
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Quote:
Originally Posted by greenduramax View Post
Ok guys needin help.....i have an 03 duramax with the 5 speed allison....ive had a chip on it since ive had it no problems....recently i changed the oil in the transmission all of a sudden it started throwin 0700 and 0735 and limpin 5th...pull the chip off its fine! Whats goin on?
You don't say.
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Old 02-19-2015, 09:47 AM
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Quote:
Originally Posted by greenduramax View Post
No had it looked at transmission is fine. And why is it you people cant answer without being smart?
Is this a test?
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Old 02-19-2015, 10:08 AM
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I think I am tested every time I am here or I feel like I should be tested every time I leave here.
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Old 02-19-2015, 11:05 AM
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My vote: burnt clutches. You can't tell by having your transmission "looked at" unless your expert looker has Xray eyes just like Superman does. Did you send the fluid out for analysis? What tests were performed to reach that conclusion?
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Old 02-19-2015, 11:10 AM
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Quote:
Originally Posted by ALLY Fox View Post
My vote: burnt clutches. You can't tell by having your transmission "looked at" unless your expert looker has Xray eyes just like Superman does. Did you send the fluid out for analysis? What tests were performed to reach that conclusion?
i dunno, i mean, i have them there calibrated eye balls. every time i look down i see 12". strangely the wife doesnt agree but i feel her eyes are not as calibrated as mine
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Old 02-19-2015, 11:22 AM
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P0735 can be caused by speed sensor, transfer case ( loose tone wheel ) or damaged clutch pack. If the problem is speed sensor or transfer case; removing programmer will not make a difference. It will still act up. If the clutch pack is weak; removing power can make a difference. If you had a weak trim solenoid; there would be more codes and other gears slipping.
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