What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Rear tire on passenger side locks up ??

T

TyBlaze74

Registered Member
Joined
Oct 21, 2022
Posts
50
Reaction score
16
Location
Charlotte
My son has a 74 Blazer. He said it is making a weird noise. Today when I was backing it out of the garage to take it for a drive to see what the noise was as soon as I turned the wheel I felt and heard it. The right rear tire was skidding when I turned the wheel. I had my son back it up and I could see the wheel locking up. It sounded like something was binding up and about to break. It seems fine going straight but as soon as you start a turn it locks up.
Any ideas where to start the troubleshooting?
Thank you.
 
might be the G80 gov lock in the 10 bolt. They are know to be weak. Combine larger tires and young spirited driver, boom nfg. Pull the cover and inspect, if your fell the brakes are not the cause.
 
It’s definitely not the brakes. Also it has a 12 bolt rear end. Does that change anything?IMG_5651.jpeg
 
jack it up, axle on body stands, front tires chocked, trans in neutral turn the tire by hand. Listen for noises at diff and axle tube.
 
I jacked the rear end up and put it in neutral. When I rotate the tires there is no noise or binding. When I turn the right tire forward both tires turn. However if I turn the left tire forward the right tire spins backwards? Is that normal??
 
Yes that is normal for an open diff.
Have someone hold one wheel a spin the other. Since problem is on turns
 
If I turn the right tire forward you cannot hold the left side. If I turn the left tire forward you can hold the right side tire.
 
Try pulling and pushing on right tire straight in and out.
Any more than 1/16" is a problem
 
When I push and pull straight in and out on the right rear it does move more than the left rear.
 
Some disassembly is needed. Start by pulling the right rear tire and drum, inspect the brakes. If the axle flange has any wiggle up, down, side to side the bearing may be bad and or the axle may be sheared.

If everything there looks good pop the cover, and look for damage.
 
TyBlaze74 said:
The right rear tire was skidding when I turned the wheel. It seems fine going straight but as soon as you start a turn it locks up.
Click to expand...
By "skidding", do you mean the tire was stationary / being dragged (like a locked bearing), or was it kind of jerking and slipping intermittently (like you have a spool/locker in the back)?
TyBlaze74 said:
When I turn the right tire forward both tires turn. However if I turn the left tire forward the right tire spins backwards
Click to expand...

TyBlaze74 said:
Also if I turn the right tire backwards the left tire spins forward.
Click to expand...
It's acting like an open diff, except when you turn the right tire forward, then it acts like a locker, so it's definitely a spider-gear-based differential. This sounds more like broken spider gears than a brake or wheel bearing issue to me. If you break or chip a spider gear it may be able to mesh in one direction, but not the other.
 
It was not stationary it was more jerking and skipping. It was the right rear tire and it was on the inside of the turn (turning right). I have not tried turning left to see if it does the same thing to the left rear wheel when it is on the inside of a turn. Would that be helpful for diagnosing the problem?
Thanks
 
I haven’t had time to disassemble anything yet but I did try to turn left and the left rear tire did jerk and skip just like the right rear tire did when I tried to turn right. So it is definitely something affecting the inside tire while trying to turn??
 
Since this is a 12 bolt, I am thinking it has limited slip differential, as opposed to a gov lock. This could be as simple as the clutches being sticky and not slipping as designed. Doing some figure 8s on hard surface will loosen the clutches up. I still recommend pulling the cover for inspection, and identify if limited slip diff (LSD). If it is LSD and grabbing it needs service with new gear oil and the correct LSD supplement additive.
 
I took the cover off and here is what I have. It doesn’t look like any of the gears are broken or damaged. There were no metal shavings in the bottom of the case and the gear oil seemed to be fine when I drained it. Any thoughts??
 
You got a Gov-Loc aka G80 - and it’s sounds like the governor flyweight/cam on it is staying engaged which is causing the lockup and chirping.

Basically what this means is that the diff is not long for this world - time to replace it or upgrade before it breaks.
 
Last edited:
You must log in or register to reply here.

Latest Posts

Top Bottom