08 GMC

Well after much regret, I bit the bullet and purchased a rebuilt 4L70e transmission. Installed it and everything is fine. Have no clue as to the problem with the original transmission as when one describes the problems, the first comment/question is "how many miles do you have" and when I answer 174K "well that's your problem, you are lucky you made it that far" with no solid answers as to what the problem actually is. Right before I swapped them out, I could put the truck in gear, smoke the tires and then wait 20 seconds and it would not move in any direction. Torque converter, cracked pressure piston or?

Been on travel since last week but the consensus is that the filter is clogged and thus stopping the engine lets the debris fall and starting it up sucks up the debris. Time to find out and search for some $ to pay for this Thanks!

Never changed the fluid as I heard horror stories when people did. Fluid is clean, does not smell and no grit... So it's confusing

Thanks

I've had my truck since new and never had a single problem until now with 174K miles. While driving down the freeway it suddenly downshifted or the OD kicked out and the rpm went from 2200-2500 to 3,000 and it would not upshift even if I let off the throttle. Pulled off the freeway, checked the transmission oil and it appears to be full and it appears to be clean Got back on the freeway and for 35 or so miles it was fine and then it downshifted or went out of OD and I took the next exit and then it acted like it was in neutral.. Hmmm. Coasted to a stopping place and shut it off. Fluid is still clean. Fired it up and it made it 1,000' or so into a gas station and I got gas. Went to leave the gas station, pulled forward and stopped for traffic and it acted like it was in neutral. Noticed that the light under the PRND2L was not lit up. Pushed the truck out of the way. Went through a reset, key on, throttle full, key off 3 minutes and wait. Drove it forward about 500' and parked correctly. Disconnected battery, grounded battery terminals. Unhooked the TCM cord and left it unhooked for 30 minutes and then reconnected everything. Fired it up and it drove like there was no problem for 500' and stopped like it was in neutral. Shut it off, luckily dead end street that I was on, waited a few minutes and parked it next to the sidewalk. hmmm Got it towed.. Rolled off the truck and fired it up, drove it 100' and parked it. Sat for a few minutes while I was handling the tow truck and went to fire it up. Went into reverse and forward but I decided to just sit and idle and try to go.. No go. Acts like it's in neutral. Shut it off. Wait a few minutes and it will go forward but I decided to shut it off. Fired it up and let it idle. Seems about 10 seconds into idle the engine pulls down a little and then if I try to shift, there's nothing there. Fluid is not burned nor brown. Have no idea as to what the problem is, torque converter, valve body, pump or TCM or just a transmission at the end of it's life? So I need to source a 4LE60, 4LE70 or? Thanks!

So should I go with any pump make or stick with only AC Delco? Thanks..

I have a 2008 GMC 1500 with extended cab and a 5.3. Fuel gauge is starting to go Bat Crazy and everyone says about 120K your pump will fail so I have 110K and it's time to replace. Problem is, there are like 3-5 AC Delco pumps that are listed "will work" but obviously there has to be a correct one. I've seen MU2371, MU1615 and others. Any ideas as to which is the correct one? Also Is AC/Delco the only brand to consider? Delphi is another popular result too.. Thanks!!!

My 2016 Denali would lurch when cold and when you slowed down for a stop sign, it would bang into gear pushing you forward like you were hit from behind. 8 speed. GM dealer said there was no problem with it..

Anyone reasonable in Dallas/Arlington area?

What is a budget for a repair shop? would it be cheaper to get one from a junk yard??

???? the dealer smells blood so they are a last resort. I was wondering if a salvage yard has a good one.

So I have 70k miles and the transmission lost 1 and 4 gear. Has a 6 speed dealer will not fix it for less than $5K. Code said torque converter was bad but now the dealer cannot find any codes. Says pay us $1k to open it up and then repairs past that. anyone else with a bad transmission ??

I, solely due to availability in my area, used the Mobil 75/90 wt synthetic oil in my rear end. Any oil will work but you might have to go to further lengths to get a certain brand if you cannot find it locally.