Going back to 3:23 from 3:91 Tech help and opinions needed

[roadrunnerh]

Hey guys -
How easy / difficult should it be to rotate the ring gear once installed? I'm not sure if I have the bearing preload too tight. The backlash is .010". Seems slightly stiff. I have yet to check the gear pattern until I know if I need to back off the bearing preload.

 

[5.7 hemi]

I’d shoot for no more than 30inlbs of rotational torque.

 

[roadrunnerh]

I marked the adjusters prior to disassembly. There is no way I can even get them to where they were. The SG unit's bearing cups are different than the open diff I'm replacing. I was hoping to get close with the marks and be more in the ballpark.

 

[5.7 hemi]

It’s gonna be different, so I’d start with the backlash and if the gears are used, concentrate on the coast side.

 

[roadrunnerh]

Is there a suitable replacement for gear marking compound? The only thing I could find locally is Prussian blue by Permatex. No local APS carry the yellow stuff.

 

[Fran Blacker]

GM sells the compound . Think this is the stuff. Dealer had it in stock, seems about 10 years ago they had a recall on rears.
https://www.amazon.com/Genuine-Fluid-1052351-Marking-Compound/dp/B00BK7MFC8

 

[roadrunnerh]

everything torqued down, I'm at .006" backlash.
here are a couple pics.

What do you guys think??

 

[Fran Blacker]

everything torqued down, I'm at .006" backlash.
here are a couple pics.
View attachment 601924
View attachment 601925
What do you guys think??

what about the drive side?

 

[roadrunnerh]

Drive side

what do ya think?

 

[5.7 hemi]

Put your hand on the carrier for some drag as you turn the yoke, then post those pics. This will help you/us see the pattern better and gives a more realistic picture.

PS, rotate the yoke at least 5-6 times.

 

[roadrunnerh]

Ok, I was wondering why I couldn't tell much, thanks 5.7 hemi! After new application of compound, providing some drag, and rotating 6 times each direction.

Now, what do you think?

 

[roadrunnerh]

Yes, the gears are old, original to the car.

 

[5.7 hemi]

Spread the marking compound at 180* from what you have now. Then repeat the drag/rotation and post up what you get on both sets. You do this to confirm that the pattern is good all around, kinda like checking backlash at 4 spots 90* from one another.

So far I’m liking what I see.

 

[roadrunnerh]

Thank you! I feel like I checked backlash 50 times!

 

[5.7 hemi]

No problem

 

[roadrunnerh]

Just completed. 180 degrees from last check.

 

[roadrunnerh]

Do I need to clean all this stuff out prior to installation in housing?

 

[5.7 hemi]

Looks good.
Just leave it, it’ll come off and mix with the gear oil.

 

[roadrunnerh]

Thank you so much! I was stressed about this.

 

[5.7 hemi]

Glad to help.