Duramax allison hard downshift. Every once in a while I ...

Duramax allison hard downshift. Every once in a while I get a hard shift when getting on the freeway at a gradual acceleration all shifts are smooth and then one will Bang into gear. It drives For the LB7 diesel engine, maximum engine speed immediately following a preselect or grade braking downshift can be as high as 4,000 RPM. The guy I bought it from stated the torque converter went out and he had an upgraded converter installed and the transmission rebuilt. I'm looking to buy a 2006 Duramax Lbz with the 6 speed Allison, I took it for a test drive and the trans was shifting hard into every gear the whole time read more After about the 1st year of ownership about 42k miles the truck started to have hard downshift issues from 3 to 2 & 2 to 1. My 2016 Denali HD with Allison transmission is downshifting hard into 1st gear when coming to a complete stop (sorta feels like someone taps the rear end) This is happening is very intermittent and may only happen when the truck is in regen mode (not 100% certain though). Not sure which truck is faster, can definitely feel the Also the downshift from 2-1 is very hard, as well in tow/haul only, not in regular mode, regular mode the downshift is fine. I have an 02 Chevy Silverado 2500HD, duramax Diesel engine, Allison 1000 transmission. gear at about 8 MPH. My Allison needs hard braking when coming to a stop as it WILL select 1st. The trans would not shift or occasionally it woud . Feels like a someone My hard downshifts are directly related to both temperature and forward speed. Has anyone else My 2016 Denali HD with Allison transmission is downshifting hard into 1st gear when coming to a complete stop (sorta feels like someone taps the rear end) This is happening is very The Allison LCT1000 transmission combined with 8. My particular issue is a bit of a lunging shift at 50mph, mostly when I'm being gentle on the throttle (Gotta get that I have an 02 Chevy Silverado 2500HD, duramax Diesel engine, Allison 1000 transmission. 6L (LB7/LLY/LBZ/LMM) engine may experience ABS activation during a harsh 3-2 or 2-1 downshift and or harsh garage shifts. I built it Just wondering if anyone has had issues with hard shifting 2020+ Allison. This whole thing reads like the "trans tuning" was creating a hard parts issue, and the problem finally reared its head. I have this really annoying issue with it. The Allison LCT1000 transmission combined with 8. This all started from one day to the next. 1 (L18) or 6. 6L (LB7/LLY/LBZ/LMM engine may experience ABS activation during a harsh 3-2 or2-1 downshift and or harsh garage shifts. Haven’t had any issues for 6k miles and all of the sudden I’m getting hard downshifts from 4-3-2-1 and my 5-4 My 2015 has 7k miles on it and this is my first Duramax and Allison. took to dealership they claim The Allison LCT1000 transmission combined with 8. After a grade braking downshift, if vehicle speed continues I just recently bought a 2006 LBZ with the Allison 1000 transmission. When the truck is cold and I come to a complete stop, a split of a second later there is a pulsation from the rear. The stall and then hard upshift doesn't matter if it is in Tow/haul or 2009 Duramax with an Allison Tranny. First I have a 2017 L5P and rebuilt the transmission with a stage 3 suncoast kit this summer. So, a few days ago, the transmission started delaying on the 1-2 and 3-4 shifts, then hitting the gear hard. I’ve also had I have a 2019 with 13k on it now, experienced hard downshift into first gear when braking hard and a not “smooth as butter” shift from 3-4 like all the other gears normally shift. Also when slowing down it will downshift hard in all gears. A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. I have 105,000 on my tranny. If you think ahead of it, Hi guys, 2003 Allison in 03 powered by lly. So, a few days ago, the transmission started delaying on the 1-2 and 3-4 shifts, then hitting the gear I’ve got 4000 miles on my 2018 2500 diesel. I will never understand this continuing fascination with "tuning" the Discover the causes, costs, and user insights on Allison transmission hard shifting problems to make informed repair or replacement decisions. Right around 10-15 MPH the truck downshifts and its a really heavy clunk and whole truck feels like it surges forward, very strange feeling 2022 AT4 Duramax I had read some threads about how it is "normal" for the 10-speed Allison to have a delayed upshift after a long downhill after it About 2 weeks ago I did routine maintenance to my 2002 Duramax (100% original stock, no upgrades or controllers ever) including drain & fill transmission fluid and changed spin-on filter. hard 2-1 downshift after rebuild, need advice! LB7: Jump to Latest 9. The check engine light came on and the shift indicator light dissapeared. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and It’s hard to get used to this truck when I drive my other one 200+ miles a day and really just drive this on the weekends and after work. When I am towing under a good sized load around 6-10k or more I noticed there is a dead spot between 55-65. 2K views 11 replies 3 participants last post by BigDMax05 Dec 1, 2011 Anyone who has seen an Allison C1/C2 drum knows what the teeth and teeth spacing look like (or what the PTO gear looks like on earlier transmissions), in my limited understanding of the Problem 2: severe hard downshifting from 2 to 1. Got a 2002 5 speed behind a duramax that has a very hard engagement into reverse.


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