Hey guys,

I just swapped out my old 741 center for a rebuilt one both are clutch type limited slips units with 3.91 gears. Prior to disassembly the axles end play checked good, with the new 741 in place both left and right axles have a ton of end play. I tried to adjust it out but no prevail.

I need this back on the road asap.... What am I doing wrong?

Are the thrust buttons still in place? Sometimes the roll pin will break.

if its an aftermarket sure grip they have a much smaller thrust spacer for some reason...my 3:73 i picked up would not adjust same as yours... just reinstalled my old 3:55 and its fine.. its 100% thrust spacer related ..good luck

I am not certain if the spacers are still there, didnt even look.... I just assumed it was there.....

If it is not, how much of chore is it to remove from my other diff?

Or is this a good time to upgrade to Green bearings?


Thank you

Personally I'd put green bearings on it and call it a day.

As much as I am an opponent of the green bearings, You said you needed it done ASAP. I would agree it is the quickest solution. Especially with PH23VO's comment.

And PLEASE let's not get the bearing debate going AGAIN

If the buttons are not in, removing the center again to install them is a lot easier and cheaper that buying and pressing on new bearings.

Faster too.

I'd agree
But per ph23vo

I have encountered a few, new aftermarket 10/12 bolt GM differentials that the C-clips for the axle retention wouldn't fit. So it may depend on what he's dealing with

I just wanted to say thank you all for the insight.... the diff I installed did not have the thrust buttons installed. I did remove the button from the old diff and problem solved! That being said..... I will hold off for the moment on a bearing change but I did opt to order 3 inch studs, my Weld draglites do not like the short studs even with the weld racing lugs and proper torque sequencing I tend to tweak the studs pretty frequently. Tired of cutting off lug nuts.

thanks for the update and glad you resolved the issue

OK I'll take my beating now LOL