I have a shudder usually between gears, all gears, also shudders when maintaining a constant speed. During calm acceleration everything is fine but everything else makes it shudder. Off the line, between gears, slightly hard acceleration traveling at any speed. Transmission was replaced not even 7 months ago. No leaks, fluid level is good, fluid it's self is fine (lots of color). Tires are balanced no wire showing and so on. Other then u-joint problems, what else could be the cause of this? Vehicle is a 1996 GMC Sierra 4x4 1500 5.7L 350 automatic transmission.

Marvin

• 85242 Answers
• Posted on Nov 02, 2008

SOURCE: 97 gmc pickup with automatic transmission trouble

1st thing to do is test the system for codes, the problem is most likely a failed or stuck shift solenoid indside the trans, have you ever serviced the trans, sometimes a fluid and filter cahnge will cure these kinds of issues.

SOURCE: transmission - no reverse

i had to put a new trans in my 2000 jimmy about a year ago there is something inside called a "reverse hub" its made from aluminum and not very hard to break..when mine broke i was stuck trying to move in reverse and it heard a pop then a winding down noise and sure enough its the reverse hub to fix it i just had the trans rebuilt

SOURCE: front end vibration and shudder on turning vehicle off

I had a similar problem with my 2005 Envoy. It turned out that the bearings had to be replaced. Both sides. I hope its not your problem, it was expensive.

SOURCE: 1989 gmc sierra c1500 with 350 automatic 8 ft bed regular cab vibration at 45 in overdrive

I had the exactly the same problem, in overdrive my truck would start to shake, in 3rd it would instantly go away, i assumed it was the flywheel to, THIS IS NOT THE PROBLEM, your tranny is in good shape and flywheel are in good shape, I had the "Idle Motor" replaced is what my mechanic called it, this completely fixed my problem, also my fuel milage went up considerably after having this replaced, hopefully this will help you out

SOURCE: 2001 GMC SIERRA C-1500 automatic TRANSMISSION problem

Check transmission lock up selenoid.