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  1. Introductions
    2011 GMC Sierra 2500HD Denali 110K So I think my TCM decided to take a dump. Getting P0700 and P0708. Got it to limp home and shut it down for dinner. 1/2 hour later it goes into a high idle at start up (800 rpm, regen not possible) won’t go into any gear, shift indicator message, getting a...
  2. 911 Problems Forum
    I just installed a stage 3 built transmission from dmax store and just took if for a drive it keeps throwing a p0717 code and not lettting me shift over second I cleared the code and same thing
  3. 06-07 LBZ & LLY Performance Parts Discussion
    Hi All. I have a 2006 GMC 2500 HD with a stock LBZ, minus a 4 inch straight pipe. Unfortunately, the turbo has had it and I need to replace it. The question: Has anyone found any benefit running an upgraded VGT turbo with a stock tune? The truck hauls a 12,000-14,000 lb trailer (weight...
  4. 2001 - 2007 (GMT800) Non Powertrain
    I don’t know if I’m posting this in the right place but any help with post/truck is greatly appreciated. This is my first diesel truck. I have an ‘01 Chevrolet Silverado 2500HD extended cab long bed Duramax/Allison, had for about a year and a half. I believe it’s the LB7. Upgrades/Mods Mishimoto...
  5. 2020+ LM2 Duramax Powertrain
    I have a 2021 at4 lm2 with the 10 speed, just recently the speedometer just randomly goes out to lunch. Going up a slight incline at about 1/4 throttle it will slam and downshift about 4 or 5 gears in one shot go from 1000rpm to 3000rpm. Then the speedometer will start reading all over the...
  6. General Discussion
    I’m new took me 20 mins to find out how to post lol! I’ve got a 2004 lly duramax I just bought I’ve owned for less then 2 weeks! Test drove it twice no issues no leaks other then ac. Me and the lady decided to buy after everything cheeking out drove the beast home an hour away parked it got up...
  7. 911 Problems Forum
    on my way home i smelt a lot of coolant the coolant add sign came on the dash and the truck started getting hot so i pulled over and find this coolant leak busted and no coolant in the truck does anyone know what line it is called or how to buy one and why it busted was the turbo getting hot? i...
  8. General Discussion
    I got a 2003 lb7 that I just did the injectors in and everything was running fine until on day on my way home I started hearing a knocking going down the highway, looked out the mirror and my truck is just constantly rolling coal. It won’t do it at idle but soon as you give it a bit of throttle...
  9. General Discussion
    Hey everyone. I've kinda hit a bump in the road hear. I blew a shock on my truck and I think I've settled on Bilstein 5100 or 5160 as the replacement. I know the truck is lifted or leveled but I'm not sure how much. I measured the block under the rear leafs and they measure 2" so I'd assume a...
  10. 07.5-10 LMM Duramax Powertrain
    Sup guys and gals I've had my 2010 2500 for about a year and have some questions about cables coming into the glove box from under the dash. Any idea with out having to pull the dash apart? I'm on a 7-8 inch lift on 35s and I get about 13 mpg and am convinced that its for a programmer and what...
  11. 04.5-05 LLY Duramax Powertrain
    Just took a look at a 05 with the lly and am confused on why this hose was cut. Had a bit of smoke/vapor coming out of it. When I did the oil cap check for a blown head gasket it passed but when I plugged that hole it started to bounce a bit.
  12. 911 Problems Forum
    Hey so som9ne stole my cat now I have an engine power reduced code on the dash please God someone tell me how to fix this I'm pretty sure it's just cuz compression how fo I add compression
  13. General Discussion
    I could really use some help. My gut tells me I’m being lied to but I don’t know enough to tell. I went to fuel my truck up last week and noticed a white vapor coming from my fuel tank, sorta like blow by. the vapor came out as diesel poured in. The key/truck was off. long story short my...
  14. 2020+ LM2 Duramax Powertrain
    Does anyone know the location of the crankshaft position sensor on the LM2 duramax. Thank you
  15. 11-16 LML Duramax Powertrain
    Doing a cp3 conversion truck is bone stock other then a Airdog. on the feed line in the valley of the engine it has a nut that holds it together will not stop dripping i’ve tried tightening it all the way down as tight as i can get it i’ve tried re seating it and still can’t get it to stop...
  16. 01-04.5 LB7 Duramax Powertrain
    Alright this is a Bible post but i need help on a customer’s truck. customer states the following- Super long story but I'll try to hit the basics here. 2003 lb7 federal emmsions truck, deleted, tuned, I rebuild top end with reman injectors, cups, drop in ddp 64 mm, fass lift pump, intake...
  17. 01-04.5 LB7 Duramax Powertrain
    Alright this is a Bible post but i need help on a customer’s truck. customer states the following- Super long story but I'll try to hit the basics here. 2003 lb7 federal emmsions truck, deleted, tuned, I rebuild top end with reman injectors, cups, drop in ddp 64 mm, fass lift pump, intake...
  18. Turbo's Stock and Aftermarket.
    I was removing the turbo to rebuild it and upgrade both the compressor and exhaust wheel. While I am in there I wanted to remove the vanes to clean them and everything associated with the hot side. 8 of the 9 vanes came off without an issue but of course the last one snapped off the stud they...
  19. 2001 - 2007 (GMT800) Non Powertrain
    Okay so we had a big rain come through over the last weekend and my passenger floor board was soaked and the plastic foot trim next to the door was full of water as well. I dried the area and I was all good for a little while until I parked up hill for a five minutes then my passenger floor was...
  20. General Discussion
    Alright guys I’m new so I hope this is the right spot to post this. I have 2003 Chevy 2500 HD 4wd with the infamous LB7( 255000 miles, injectors changed about 25,000 miles ago, only mod is a CAT filter adapter)…… (in Alabama) one day about 2 months ago I was just riding down the road and and I...
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