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2020 3500 diesel 10 speed transmission

problems downshifting

2020 3500 diesel 10 speed transmission

Postby dickeys01 [OP] » Jul 27 2020, 1:38am

New 2020 3500 duramax 10 speed transmission 1400 miles on it. Making loud noise in transmission when slowing to a stop. feel clunking into maybe 2nd gear and not dropping into 1st. at dealer to be looked at tomorrow. Any know problems with the new 10 speed trans? I'm hoping it's just a computer glitch.
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Re: 2020 3500 diesel 10 speed transmission

Postby Z15 » Jul 27 2020, 3:05am

Don't know of problems but seen a video of a GM engineer and there was a comment about the trans will take off in 2nd gear if you are not in tow/haul so that may why its not downshifting to 1st
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Re: 2020 3500 diesel 10 speed transmission

Postby CT2500HD » Jul 27 2020, 2:25pm

A clunk on downshifting is most-likely just the driveline taking-up backlash in the ring & pinion. There's a very small amount of free-space between both the ring and pinion in both axles. When coasting with no drive/torque applied, its just floating space. When drive/torque is suddenly applied (like when you downshift and now the driveline wants to drag), that little extra space between the teeth in the gears will be slammed together and make a clunk. I have not yet driven the 10-speed, so I cannot comment on its behavior, but that's a ton of gears to downshift through and the lowest may are probably VERY low.
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Re: 2020 3500 diesel 10 speed transmission

Postby dickeys01 [OP] » Jul 27 2020, 2:47pm

Thanks for the info, It's in the shop and I will post what is found.
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Re: 2020 3500 diesel 10 speed transmission

Postby Okiehunter01 » Jul 27 2020, 5:38pm

I have a 2020 3500 At4 that now has 12500 miles on it with about 10k of it pulling a loaded goose neck and
So far(knock on wood) no problems with the 10 speed trans!! No noises down shifting or anything but I do always make sure I’m in the trailer mode and tow haul!
Hope that relieves a bit off of your mind maybe!
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Re: 2020 3500 diesel 10 speed transmission

Postby dickeys01 [OP] » Jul 27 2020, 6:33pm

I've pulled my 40' RV about 40 miles once, by 30' boat 3 times, pulls like a dream but this problem is happening with no load on it. :(
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