8.8 rear end (both tires are locked together)

StrollingBowling · Apr 30, 2018

I did a gear change last week. Took out the 410 and installed a 331 in 90 GT. Drove it Saturday without any issues. Sunday I drove it and notice when turning there was a popping sound that you could feel coming from the rear of the car. Jack the car up and found that you can not turn one tire and hold the other one still. Any idea what would cause this. Did not have any issues before the gear swap. Everything went together easy

srtthis · Apr 30, 2018

what diff did you use?

StrollingBowling · Apr 30, 2018

srtthis said:
what diff did you use?

What was in the rear end. Stock diff

srtthis said:
what diff did you use?

Stock what was already in the rear end. I think this rear end is not the original. It does not have a tag on it. Diff has springs in it

srtthis · Apr 30, 2018

did you happen to take a picture of the diff?

StrollingBowling · Apr 30, 2018

srtthis said:
did you happen to take a picture of the diff?

No but I am draining and taking the cover off after work. I will snap a photo of it then. Would like to know what it came out of. Some people just butcher a good fox

85ragtop · Apr 30, 2018

Had my open diff do that on my first t- bird. Welded itself together. Stock 7.5 couldn't take the abuse.

StrollingBowling · Apr 30, 2018

srtthis said:
did you happen to take a picture of the diff?

StrollingBowling · Apr 30, 2018

Here are the photos. I don’t see anything out of the normal but have never taken this type of diff apart before

StrollingBowling · Apr 30, 2018

StrollingBowling said:
Here are the photos. I don’t see anything out of the normal but have never taken this type of diff apart before

General karthief · Apr 30, 2018

What type of gear oil did you put in it?

Noobz347 · Apr 30, 2018

These are the clutches I was referring to:

Noobz347 · Apr 30, 2018

It is possible they are stacked incorrectly.

StrollingBowling · Apr 30, 2018

You can not turn just 1 tire

General karthief said:
What type of gear oil did you put in it?

I used Royal Purple Max Gear 75w140 Gear Oil when I changed the gears did not remove any clutched

General karthief · Apr 30, 2018

You should not be able to turn just one wheel.

StrollingBowling · Apr 30, 2018

so on a jack both will turn together? I am use to seeing one turn one way and one turn another but I have never done that on this car. Maybe my popping noise is not inthis and is in the shocks I also changed the upper and lower control arms

Noobz347 · Apr 30, 2018

How long ago was this done? Was the pinion gear done at the same time? Re-measure everything and recheck engagement pattern.

I have not had that specific traction lock (I'm very fond of the OEM unit), so I could not tell you what is normal noise for those things.

You should change your thread title to include the words, "Yukon Traction Lock".

You might also be interested in these reviews: https://www.americanmuscle.com/yukon-31spline-88-posi.html

Noobz347 · Apr 30, 2018

StrollingBowling said:
so on a jack both will turn together? I am use to seeing one turn one way and one turn another but I have never done that on this car. Maybe my popping noise is not inthis and is in the shocks I also changed the upper and lower control arms

That's because you are used to an open differential and not a positive traction diff.

The faster one wheel turns ahead of another, the tighter the clamping force on the clutch packs. That's what those extra spider gears are for.

StrollingBowling · Apr 30, 2018

I don't think it is a Yukon it just looks like one. I am not sure what this rear end came out of. I am thinking it came from a 87 mustang. I am going to check the shocks to see if that's the noise I am hearing and feeling. all of them are the original I will let you know what I find. I am now thinking the diff is ok. Like I said all I did was change the ring and pinion gear, did not have this issue before. Shocks locked up when car was up in the air so that maybe it.
Thank you for the break down of this unit.

Any way to tell what this rear end came out of?

slow84lx · Apr 30, 2018

With a positive traction rearend both axles will always stay engaged together unless it is slap worn out or broken. The rearend that you have may be from a Mustang but it didn't come down the assembly line with that differential in it. You are looking at an aftermarket Yukon differential.

Take a real close look at your upper & lower control arms. They can bind and cause popping noises. Bolts should not be tightened until is fully weighted on the ground.

What upper / lower control arms did you use? Rubber bushings or poly?

srtthis · May 1, 2018

looks like an eaton to me

8.8 rear end (both tires are locked together)

New Member

the guy doing it does every local racers rear end

New Member

the guy doing it does every local racers rear end

New Member

BTW, I like dudes.

New Member

New Member

Attachments

New Member

Attachments

wonder how much it would cost to ship you a pair

Stangnet Facilities Maint Tech... Er... Janitor

Stangnet Facilities Maint Tech... Er... Janitor

New Member

Attachments

wonder how much it would cost to ship you a pair

New Member

Stangnet Facilities Maint Tech... Er... Janitor

Stangnet Facilities Maint Tech... Er... Janitor

New Member

clean it good before insertion

the guy doing it does every local racers rear end

Similar threads

Privacy & Transparency

Privacy & Transparency