Search Results for ‘allison’

I have an LML with 115,000 miles. When the power was increased (around 90k miles), my shop advised that I should install an EPC fooler to help the Allison hold power. I don't have crazy power, its got stock air, fuel, trans. Maybe pushing 500hp max on 5. But ever since the EPC has been installed...

Was under the truck today to find where my power stealing leak was coming from found out it was the hydro boost itself but while under noticed my Allison had a little fluid on it. Anyone know what this nut is?

I have a 2003 duramax with the Allison 1000 and I’m wondering if anyone has any insight to a new issue that came about. Driving down the road the truck is in 5th gear, TCL. Drives and shifts great. However, going down a small decline in a hill it seemed as if 5th gear slipped (truck revved up)...

2007 LBZ Duramax Allison 1000 transmission. Stage 4 rebuild kit as well as paper rubber and ring kit installed. Billet converter, purchased reman valve body complete with harness, solenoids, transgo jr shift kit and updates done as well ( supposedly). New (ims) installed. Billet...

I changed my #6 glow plug in my 2011 2500 this morning now my transmission randomly will not go into gear. Sometimes it runs/ drives just fine, other times the gear selection indicator will not show up and it doesn’t go into gear/ drops in gear very aggressively. I think it might be a wiring...

I bought this 2005 GMC 2500 Duramax for the main purpose to carry my truck camper (2012 Northland ~ 2700lbs) and be able to tow my snowmobile trailer (~1500-2000lbs) or boat (also ~2300-2700lbs). It hauls the camper just fine and the trailers are ok to haul unless I am at lower speeds (30mph...

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.

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...

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...

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...

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...

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?

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.

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...

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...

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...

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...

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...

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?