1994 1500 sierra vibration when shifting at high speeds


Asked by markeddy Jan 01, 2011 at 06:59 PM about the 1994 GMC Sierra 1500 C1500 SLE Extended Cab LB

Question type: Maintenance & Repair

when driving at constant speed over 40 the truck shakes when downshifting to maintain speed. carrier bearing was loose so i shimmed it to see if that was a fix. not as bad but still doing it. is this a possible driveshaft problem?

7 Answers

Not Active

bad u joints.on drive shaft,or out of ballance tires,or warped rotors.bent wheel.


ive changed u joints and carrier bearing. all driveline vibration and rumble is gone. no tire vibration at any speed or when braking. still have the shudder when shifting in and out of overdrive. feels like it starts in motor and travels through truck. maybe a spun or damaged harmonic balancer? the truck was hit in front and repaired. i did not own it before wreck so i dont know if this was a problem before or as a result of the wreck. any thoughts?

Not Active

ok now it sounds like the lock out in TQ is not working,if HB was damaged it would not run.how does it do in drive,no overdrive.


it does it in drive as well but only at high rpm- above 3000

Not Active

sounds like the TC is going out.


thanks. i gues that will be the next step.


the center support is pressed on if you shimed it your stub is shot ujoint failer is also a thiong to look at textbook speeds are between 40 to 65 for vibration

Your Answer

Add photo

Related Questions

Sierra 1500
Looking for a Used Sierra 1500 in your area?
CarGurus has 63,889 nationwide Sierra 1500 listings starting at $1,000.

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
Reputation 3,560
#2 John Saffrahn
John Saffrahn
Reputation 2,350
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 1,930
View All

Related Models For Sale

Used Ford F-150"
2,930 Great Deals out of 178,420 listings starting at $1,000
Used Dodge Ram 1500"
617 Great Deals out of 13,161 listings starting at $1,995
Used Toyota Tacoma"
520 Great Deals out of 19,666 listings starting at $2,000
Used Chevrolet Tahoe"
799 Great Deals out of 32,226 listings starting at $175
Used GMC Yukon"
214 Great Deals out of 8,690 listings starting at $2,495
Used GMC Sierra 2500"
6 Great Deals out of 159 listings starting at $3,499

Used Cars For Sale

2015 GMC Sierra 1500 For Sale
57 Great Deals out of 32,046 listings starting at $20,990
2014 GMC Sierra 1500 For Sale
175 Great Deals out of 3,870 listings starting at $16,995
2013 GMC Sierra 1500 For Sale
145 Great Deals out of 3,113 listings starting at $12,356
2012 GMC Sierra 1500 For Sale
109 Great Deals out of 2,417 listings starting at $11,500