Differential yoke torque

[MrDee]

I need to swap out the yoke on my 69 440 GTXs 8.75 differential. Do I re-torque the pinion nut to 170 ft pounds when I install the new yoke?

 

[RJRENTON]

I need to swap out the yoke on my 69 440 GTXs 8.75 differential. Do I re-torque the pinion nut to 170 ft pounds when I install the new yoke?

Use the value listed in the factory shop manual (FSM). Depends on whether the rear end assembly uses a crush sleeve or shims to set the pinion bearing pre-load....a value listed in the FSM as well the the nut torque. The yoke must be held stationary while tightening the retainer nut.....the FSM depicts the methodology used. Are you working in the differential assy. in the car or on the bench? Just my opinion, of course....
BOB RENTON

 

[Jerry Hall]

742 or 489 case?

 

[MrDee]

Use the value listed in the factory shop manual (FSM). Depends on whether the rear end assembly uses a crush sleeve or shims to set the pinion bearing pre-load....a value listed in the FSM as well the the nut torque. The yoke must be held stationary while tightening the retainer nut.....the FSM depicts the methodology used. Are you working in the differential assy. in the car or on the bench? Just my opinion, of course....
BOB RENTON

Cars on the lift. It's the 489 diff and unless someone has used a Dr Diff crush sleeve eliminator, it's a crush sleeve. The fsm calls for a minimum of 170, so the more I ponder it, the less confident I become.

 

[AR67GTX]

I know replacing the yoke with a crush sleeve is a bit tricky. As I recall, isn’t there something about marking the nut and pinion shaft, and count the turns for removal of the nut and then put it back the same number of turns on the nut and realign the pinion and nut marks?

I used a crush sleeve eliminator on my 489 so I’m not sure of the process if it has a crush sleeve.

I would PM dvw and see what he recommends.

 

[MrDee]

I know replacing the yoke with a crush sleeve is a bit tricky. As I recall, isn’t there something about marking the nut and pinion shaft, and count the turns for removal of the nut and then put it back the same number of turns on the nut and realign the pinion and nut marks?

I used a crush sleeve eliminator on my 489 so I’m not sure of the process if it has a crush sleeve.

I would PM dvw and see what he recommends.

Yes, but I'm changing the yoke, so marking things won't apply. Who's dvw?

 

[Don Frelier]

@dvw is one of our resident experts.
I think @Cranky has a good deal of experience building differentials as well

 

[MrDee]

742 or 489 case?

489

 

[MrDee]

@dvw is one of our resident experts.
I think @Cranky has a good deal of experience building differentials as well

Thanks, Don

 

[dvw]

The way we did crush sleeve stuff at the GM dealer was to mark the nut before removal. Then lock tite and reinstall the nut just past the mark. Never had one come back. Crushing the sleeve further is not what you want.
Doug

 

[MrDee]

The way we did crush sleeve stuff at the GM dealer was to mark the nut before removal. Then lock tite and reinstall the nut just past the mark. Never had one come back. Crushing the sleeve further is not what you want.
Doug

I'm installing a new yoke. I did mark the old yoke. I was thinking of reinstalling the old yoke and seeing what torque it takes to put the old yoke back on its marks. Then removing the old yoke and installing the new yoke to that torque number.