Another 8 3/4 pattern question

[Mysons68dart]

So I'm setting up my 741SG This was a used case I bought from the Spring fling I'm sure somebody had already replace these gears they have a 1995 stamp on them so I removed the old bearing It has the .091 Spacer under the bearing and I am using the Gear set I wish I could Put a lower gear in it but don't have the bucks right now so I'm going to re install this 323 Set From what I understand from the forum if I use the old set I don't have to worry about reshaping the pinion depth but I don't know if this was ever set up right to begin with so I honed to new koyo Bearing and Installed The pinion with out the main spacer between the 2 bearings tightened up the nut to take the play out then set up the backlash at .008 So my question is by looking at the pattern I know I need to decrease the spacer thickness to bring the pinion depth deeper I can take this spacer and put it on a magnetic table grinder and take off as much as I want how much do you guys think I need to go I was thinking of going .010 or .020 ? If i go .020 And it's too much I can always put a shim back in it

2nd question if I use a koyo set up bearing will there be any difference if I use a timken As a run bearing? I would not think there would be that big of a tolerance difference between manufacturers but just throwing it out there to see what you guys think.

And last Question my Torque wrench only goes to a 150 pounds is there a way you guys torque the pinion nut to 240 pounds without having to go buy another torque wrench . Thanks for all your help in advance.

 

[john-9]

should be minimal difference in dimensions between the 2 bearing brands -- but since you have to make a shim change check your pattern after installing the bearing you are going to use for the final set up-
Make shim changes in .003 increments
why not just buy a 741 case pinion shim kit from Ratech Manufacturing # 1109 ( $13.00 ) - available directly from Ratech or thru Summit Racing

rule of thumb for 8-3/4 and Salisbury type differentials ( cover on back of housing )
-- on the drive side of tooth too much toe ( bottom of tooth ) subtract shim
-- on the drive side of tooth too much heel ( top of tooth ) add shim
get the drive side correct and the coast side will follow.

 

[Mysons68dart]

should be minimal difference in dimensions between the 2 bearing brands -- but since you have to make a shim change check your pattern after installing the bearing you are going to use for the final set up-
Make shim changes in .003 increments
why not just buy a 741 case pinion shim kit from Ratech Manufacturing # 1109 ( $13.00 ) - available directly from Ratech or thru Summit Racing

rule of thumb for 8-3/4 and Salisbury type differentials ( cover on back of housing )
-- on the drive side of tooth too much toe ( bottom of tooth ) subtract shim
-- on the drive side of tooth too much heel ( top of tooth ) add shim
get the drive side correct and the coast side will follow.

Thanks john that really helps !

 

[TrailBeast]

Thanks john that really helps !

A 3 foot pipe on my 1/2 drive breaker bar with my 200lbs bouncing on the end of it is about right for the torque.
If you have the crush sleeve eliminator that 240 being perfect isn't critical as long as your pinion still turns within it's suggested spec.
Never had one fail or come loose.