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1-20 of 42 Results
  1. 911 Problems Forum
    Hey everyone, I've been throwing the ol parts cannon at my 03 duramaxs transmission. The tcm shit the bed,I've replaced it and now it moves but I now have shift solenoid B staying stuck on and It won't shift out of second now! Please send help.
  2. Transmission Shop
    I have a 2005 2500hd 6.6L duramax with a 5 speed allison. When starting the truck up, I noticed there was no light under PRND321 showing what gear I was in. When I backed out of the driveway, the truck rocked backwards and I knew something was off. Before I got out of the neighborhood, the ABS...
  3. Transmission Shop
    Last night driving home I blew off one of my transmission lines and dumped all my transmission fluid. I recently bought the truck so I have not had time to go trough all the routine maintenance that I have seen listed on here for when you buy an older used truck. Yesterday morning I did get the...
  4. Transmission Shop
    How the hell do I get my converter bolts out??? I’ve tried multiple impacts and extensions can’t even get one bolt to break loose. Pulling transmission to replace cracked tail housing. Can I pull transmission then torque converter? I’m at a loss. The biggest impact I’ve hit it with is 3/4 rated...
  5. 07.5-10 LMM Duramax Powertrain
    I have a 07.5 Silverado 2500 LMM. It seems lately the truck will randomly get stuck in gear or hard shift. Restarting the truck sometimes resolves the issue. Sometimes it works perfectly fine and there is no issue, it usually happens at least once if you drive it for more than 45 minutes at a...
  6. Transmission Shop
    Pulled a camper to Florida with it no problem, the while driving around it seemed like it was making a metal sound and not shifting into overdrive cause the rpms stayed kinda high got underneath truck and seen it was dumping out trans fluid what could be the possible cause?
  7. Transmission Shop
    Hello, I've read that it is not recommended to flush the Allison transmission. Can anyone tell me where this information is officially posted? Either on Allison's website or, more preferably, in the owner's manual? Particulalry for an '07 Classic. Thanks.
  8. 01-04.5 LB7 Duramax Powertrain
    Hey guys, yesterday i was headin to work in my 02 duramax and my truck revved up and i think it came outta 5th gear and into 4th and the service engine light came on. I was going about 65 on cruise, and i hit the gas to accelerate to go around this car and thats when it happened. Any ideas? to...
  9. Transmission Shop
    A few months ago I posted on here about intermittent shifting issues I was having with my 2011 GMC LML. Someone said to try changing the brake switch and that solved my problems for the time being, but after a few weeks they started coming back again. I was pretty convinced that the problems...
  10. Exterior
    Hello, I’m new here. I have a 2007 LMM Crew Cab. For some reason it came stock with an annoyingly small 26 gal fuel tank. I’m curious if anyone has done an upgrade and what your experience was? Will a larger stock tank fit with no modification? Also, I’m wondering about the Allison Transmission...
  11. Transmission Shop
    Hey guys, looking for some advice on my truck. It is a 06 duramax lbz all stock with the allison automatic 186k miles. Yesterday driving my truck home from work I noticed my truck was shifting later than usual, and at some speeds(right around 32-45) didn't want to shift up into the higher gear...
  12. Transmission Shop
    I just joined the forum last night. I'm desperate for some guidance on the random shifting issues I am having with my 2011 GMC 3500 Sierra 4wd. It started a couple weeks ago. I pulled up to a job site and when I went to leave and put it in gear, I got the "shift inhibited" message and it would...
  13. Transmission Shop
    I need this truck every week for my compost route, satellite garbage truck on the back. 70,000 miles, well kept. Was working fine until Thursday the trans was slipping a little going up 2nd to 3rd then later in the day clunking down into 1st coming to a stop. No lights or codes no warning. What the?
  14. 06-07 LBZ & LLY Duramax Powertrain
    Long time forum searcher and can usually find what i'm searching for but ran across a problem this summer i cannot seem to fix yet and would appreciate any ideas. -Problem- Truck Allison and LBZ are getting hot instantly while pulling hills and warnings go off. (ECT 250, EGT 1400+, Trans Fluid...
  15. Drivetrain
    I have a 2007.5 GMC Serria 2500HD LMM with the 6-speed Allison Transmission 4 wheel drive, the other day I went and picked up a mini excavator and was towing it home when I noticed something iv never noticed before. I stopped at a red light in town and when the light turned green I let off the...
  16. 911 Problems Forum
    Tried posting in Transmission Shop... Hi all, First time I have had an issue with this truck. 2009 chevy silverado 2500hd duramax with allison 199k miles at Diesel mechanic every 6k for maintenance. The facts: Driving normal at slow speeds (City road) when check engine came on. Gear...
  17. Transmission Shop
    Hi all, First time I have had an issue with this truck. 2009 chevy silverado 2500hd duramax with allison 199k miles at Diesel mechanic every 6k for maintenance. The facts: Driving normal at slow speeds (City road) when check engine came on. Gear selection P,R,N,D disappeared. (Don't...
  18. 01-04.5 LB7 Duramax Powertrain
    2014 chevy silverado 3500 HD 6.6L Duramax / 6 speed Allison... While getting some brake work done, I was thinking of having the transmission flushed. But the mechanic told me that if it's never been done before, I could have a blown transmission within a week. I guess a flush would clean all...
  19. Transmission Shop
    I'll try to keep this short and still include all the details. First things first: 2005 2500HD Duramax LLY 2wd Base Model Allison 1000PK Trans 317,000 miles So this is a shop truck / equipment delivery truck for our shop. (Equipment rental business). Its had years of hauling equipment and...
  20. Transmission Shop
    I recently pulled my transmission after the torque converter went bad. While I had it out, I decided to pull it apart and inspect the internals. Mind you, I have built one of these transmissions in the past with good success on my LB7. I found the C3 clutches had a little more wear than I liked...
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