1994 1500 sierra vibration when shifting at high speeds

65

Asked by 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?

8 Answers

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

65

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?

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.

65

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

sounds like the TC is going out.

65

thanks. i gues that will be the next step.

220

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

I have a 1994 gmc pick-up. when in park the truck runs fine. but as soon as I put it in drive the hole truck shakes like really bad and gets worse when speeding up. what could that be?

Your Answer

Add photo

Related Questions

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 60,004 nationwide Sierra 1500 listings starting at $999.

ZIP:

Search GMC Sierra 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,650
#2 John Saffrahn
John Saffrahn
Reputation 3,240
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,910
View All

Related Models For Sale

Used Ford F-150
3,005 Great Deals out of 207,341 listings starting at $1,000
Used Dodge Ram 1500
496 Great Deals out of 12,990 listings starting at $1,495
Used Toyota Tacoma
705 Great Deals out of 31,690 listings starting at $2,750
Used GMC Yukon
557 Great Deals out of 17,086 listings starting at $1,875
Used Chevrolet Tahoe
811 Great Deals out of 27,743 listings starting at $1,700
Used Chevrolet Camaro
378 Great Deals out of 40,505 listings starting at $3,500

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
22 Great Deals out of 32,758 listings starting at $23,800
2016 GMC Sierra 1500 For Sale
74 Great Deals out of 4,594 listings starting at $18,990
2015 GMC Sierra 1500 For Sale
144 Great Deals out of 4,239 listings starting at $15,985
2014 GMC Sierra 1500 For Sale
151 Great Deals out of 4,250 listings starting at $8,988
2013 GMC Sierra 1500 For Sale
111 Great Deals out of 2,459 listings starting at $9,950