Rear end slop
 

Maybe I just used bad search terms but I couldn't find good info on how much slack should be in my 12 bolt 4.10 rearend. When we reinstalled my axles after the brake upgrade I was messing around and the yoke will spin I would guess ~3/4" before the wheels actually engage. What type of tolerances are normal here, and is there other problem areas if tho is out of tolerance besides a rebuild/resetting of gear lash?
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Re: Rear end slop
 

I have not actually measured the rotation as you did but it seems to be close to normal when you consider that the spider gears , axles, and ring/pinion gears are part of the looseness. If no one comes up with more information I will get a measurement like yours off of a 12 bolt.

Jim

Re: Rear end slop
 

That is pretty close,the spider gears have a lot of slop in them!If it has a posi,whole different story,lol!

Re: Rear end slop
 

No posi... For now. My hope is to run the axles as is for now and once the truck is finished and cash flow has recovered, drop it off and have a posi and all new pumpkin guts installed down the road.
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Re: Rear end slop
 

More than likely the spiders are excessively worn. You can purchase a spider gear kit to replace them which should tighten things up assuming ring and pinion are in good shape.

Re: Rear end slop
 

GM factory service manual has all specs and tolerances for ythe rears listed