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Old 08-15-2016, 05:15 PM   #1
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New dmax owner, but a bad start

Back in April I upgraded to a used 3/4 ton Chevy gasser. Awesome truck, but the 6.0 and 3.73 left a little to be desired when it came to hills, headwinds and anything above 3000' alt. So, decided a diesel was in future. Might as well do it now, while the gasser was worth more if I'm going to do it eventually anyhow.

Picked up a '16 2500 LT with the dmax. Love the truck. Empty I'm at 21mpg mixed driving, and the ride is even better than the 14 was. Really like it. Now the bad. About 40 miles into it, I parked, shut down and ran an errand. Came back out, start up, put it in reverse, I've got all indications I'm in reverse, but engine just revs. Back in drive pull forward try reverse again, it's all good. It does this three different times today. The last time, I revved it more and it jammed into gear and jumped back somewhat violently. Seems to only happen if it sits a few mins or more. Needless to say, it's day one, I'm irritated and in a loaner now. Very happy I was fortunate enough to be able to have the truck, but frustrated it had a problem right off. Also, I'm sure this will be a "could not duplicate" type thing.

Any dmax/Allison owners here ever experience anything similar? Trans fluid was full, and zero codes.
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Old 08-15-2016, 09:46 PM   #2
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Never had that in 3 different Dmax/ALLISON combos. Seems like it may just be an adjustment on the linkage for the tranny. I don't think I would like have revved it and then dropped the shifter though. Lol.
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Old 08-15-2016, 09:57 PM   #3
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An Allison should not move if rpms are elevated off idle when shifter is going from park to a moving gear.


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Old 08-15-2016, 10:02 PM   #4
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Quote:
Originally Posted by DocGTO View Post
Never had that in 3 different Dmax/ALLISON combos. Seems like it may just be an adjustment on the linkage for the tranny. I don't think I would like have revved it and then dropped the shifter though. Lol.


It was in reverse already. Heard it click into reverse. Camera came on. It indicates reverse in as the gear indication. All indications were that was in reverse. I reved a little and It wouldn't move. Then revved a bit more, not thinking it would jump and it did.
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Old 08-15-2016, 10:02 PM   #5
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My old 2005 dmax we would take a minute to warm up and work properly in reverse. Some times i dropped in gear right After starting and it wouldnt move. I think mine was a little low on tranny fluid when it did it though as i had a slight leak on one of the pto cover plates.
Never had a problem with my new Gmc duramax.
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Old 08-15-2016, 10:13 PM   #6
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Take it to the dealer. They should be able to pull some codes or find a fluid low like tranny fluid.
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Old 08-15-2016, 10:21 PM   #7
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Take it to the dealer. They should be able to pull some codes or find a fluid low like tranny fluid.
Its already there if he has a loaner
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Old 08-16-2016, 12:49 PM   #8
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Sounds like an internal pressure problem especially If you rev the engine and then the reverse clutch applies. Low fluid also causes low pressure
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Old 08-16-2016, 12:59 PM   #9
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I had a similar issue in a different brand of truck... It ended up being the rear end had a bad gear in it.
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Old 08-16-2016, 01:01 PM   #10
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Quote:
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Any dmax/Allison owners here ever experience anything similar? Trans fluid was full, and zero codes.
I had a similar problem, but mine did not want to go pass the 3rd grear. worst it was random, take to the dealer, but all time it was OK, until I got lucky it did it at the dealer.

Was a Pressure sensor problem in the allison transmission.

replace, and since no more problems. that was 4 + years agoo.
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