transmission

While attempting to fix a problem with the truck randomly shifting into4WD, I think I broke it. I pulled the encoder motor, front driveshaft, front actuator to test the motors. I believe I failed to align the encoder motor and transfer case to neutral when I put things back together. When I...

New owner of a nice 2018 Sierra SLT with Ll-Terrain package. I have owned it less than a week. My simple question: Am I correct that there is no indictor on the digital display, showing what gear the transmission is in? This seems very odd to me. What am I missing, or why would this...

My 2013 Yukon XL Denali recently started slipping out of gear when coming to a complete stop at a red light, stop sign, etc. Once I let off the brake, it kicks back into gear but can take up to 3 seconds to do so. If I hit the gas prior to it kicking back into gear, it kicks in really hard...

2016 Yukon Denali, about 53,000 miles. Anyone else noticing a shudder or vibration while at cruising speed? No specific speed or rpm. Doesn't happen when accelerating. Please share ideas; I want to know what I am facing BEFORE I take it to the dealer.

2000 GMC Sonoma SLS Ext Cab 2.2L 134CI L4 FI 4L60E For the last couple of months I have been seeing my ABS light coming on (usually after hitting a sharp bump in the road) and occasionally while the yellow ABS light is on the red BRAKE light will flash briefly and the speedometer will pulse...

HELP!?!?!? I just bought a '98 Jimmy SLE 2x4 4dr w/ 4.3L Vortec V6 4dr for $3,200and it broke down the 1st time we drove it! My gf is in very delicate health and we desperatly needed reliable transportation to get to/from docs/hosps. So we drove home from Hemet 60 miles , then it...

hello all and happy new year! i have a 1990 GMC SUBURBAN SLE V1500 4x4 with about 342K on the body 350 with the 4 speed auto transmission recently while i was driving it, i would hear a loud popping-type sound while coming out of a 90 degree turn at relatively low speed. this...

Our transmission is having problems in reverse (meaning it will not go into reverse). When in reverse it feels like the vehicle bogs down. As well as in drive will not upshift into second nor any other gears. I have the v6 vortec style engine. I have some basic understanding to rebuild this...

Several months ago, we purchased a used 2008 GMC Acadia. Within a few months, the transmission went out (as experienced by so many other owners). We repaired it at our own expense. After reading about the multitude of issues others are having with this vehicle we decided to trade it in before...

Heeeeelllpp!!! I purchased a 95 GMC pickup about a year ago. It had sat for approximately 3 years. The guy I bought it from said the 305ci motor had been rebuilt before the 4L60e transmission went out and they didn't want to put anymore money in it. So they parked it. The transmission would go...

I Have a 1997 Gmc Jimmy 4x4 it does have quite a bit of miles on it(130-140 cant remember off the top of my head) but its been acting odd lately, first off there are 2 check engine lights on it one is a charcoal box that needs replaced in the rear by the gas tank, second i believe is a coil pack...

Hi and greetings as this is my first post. I have a 2000 GMC Jimmy/Envoy and it has 172200 miles. I just replaced the following, plugs,wires, cap&rotor 2 02 sensors, and when I go to heavy accelleration from a stop it sputters like cuts out,doesn't die but I have to back off the throttle to go...

I have a 2007 GMC Yukon Denali. Everything is stock. 90,000 miles. Tires are about 50%, brakes are good, alignment is good. When I'm traveling above 60mph and let off the gas it vibrates hard... just like going over rumble bars. It has that feel but not quite as much noise. This is the only...

2011 Sierra All Terrain that is having a continued issue with a driveline shudder vibration sensation only after I let off the gas to coast and upon light acceleration I feel and hear a vibration for about 1-2 seconds. The best example would be "In Town" driving around 20-30 mph (but not limited...

When going into reverse I heard a loud bang then my car stopped going into reverse. its as if the back tires are locked. you can push hard on the gas and it will move but it makes a loud noise and jumps backwards. So it shifts into reverse but doesn't want to move. it also makes the noise when...

Hi, i have an 01 sierra 4.8L 2 wheel drive with a 4l60e automatic trans. the transmission is having problems and i want to see if anyone has had the same problem or can confirm what i am thinking. In second gear it will hold up to 3,000 rpms, beyond that the rpms will sudenly redline if im still...

Hi, i have an 01 sierra 4.8L 2 wheel drive with a 4l60e automatic trans. the transmission is having problems and i want to see if anyone has had the same problem or can confirm what i am thinking. In second gear it will hold up to 3,000 rpms, beyond that the rpms will sudenly redline if im still...

Started to back up my driveway, heard a loud "clunk", then a whirring sound, then no reverse gear. Drive gears appear to be engaging fine, just no reverse. Realizing I've got to head to a transmission shop, I'm wondering if this exact situation is familiar and a GMC owner can educate me as to...

So it starts out fine then when it shifts out of first it has no Power it just revs up and wont go anywhere in any gearI have to turn it off let it sit for a minute then it will go fine Till it shifts again have any ideas? Thanks

Hey, I'm new to the Forum. I have a 2001 Sierra with a 5.3L V8, I just put a new HYPERTECH Max Energy tuner into it and I'm wondering if anyone could help me on tuning my transmission shift points etc to gain the most power yet still conserve the fuel economy. Also if anyone has any suggestions...