i dont know mind does the same thing 1993 iv done everthing only thing left is out of round rim or out of balanced drive shaft
A stock GMC Typhoon is governed by the ECU and will not exceed 124 MPH.
135 mph
Speed limiters build into the truck are for safety reasons, defeating it would be dangerous
Bad CV joint? How about a bad steering box?
Can you elaborate a little? How do you know it's the transmission? Describe the vibration. Is it only at 45 mph? Does it vibrate when you let off the accelerator?
Sounds like wheel imbalance or driveshaft, if it's been out recently.
ive had my 2006 gmc dually 3500 up to 135 mph hitting 2500 rpms
Clogged Transmission line, or axle needs to be checked.
Most likely your wheels need balanced.
100 mph then vuts off and refires at 99 mph
5 mph.
150 Mph