looking for torque specs

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looking for torque specs

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Blazer Forums >> Mechanical & Maintenance >> Steering, Suspension & Drivetrain >> looking for torque specs

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looking for torque specs - 4/5/2008 7:39:03 PM

cbash1979

Posts: 21
Joined: 12/18/2007
Status: offline

ok i am going to be redoing my rear drive train and was hoping someone knew what the torque specs of all the bolts inside the differental were so i dont over tighten or anything like that if you have a link that would be great or if you know i have been looking on google for it and cant seem to hit the rite links but ill keep trying til someone posts a link or knows also have been reading this chiltons book i have on the 98 jimmy also

thanks for all the help if i forget to say it again

Post #: 1

RE: looking for torque specs - 4/5/2008 8:29:10 PM

Chevy Lover

General Tech Moderator
Posts: 3411
Joined: 6/11/2006
From: Vancouver. B.C. Canada
Status: offline

Hope this helps
Fastener Tightening Specifications
Bearing Cap Bolts

75 N·m

55 lb ft

Differential Housing Cover Bolts (7.6" Axle)

30 N·m

20 lb ft

Differential Housing Cover Bolts (8.6" Axle)

39 N·m

29 lb ft

Fill Plug

33 N·m

24 lb ft

Pinion Shaft Lock Bolt (7.6" Axle)

34 N·m

25 lb ft

Pinion Shaft Lock Bolt (8.6" Axle)

36 N·m

27 lb ft

Ring Gear Bolts

120 N·m

90 lb ft

Vent Clamp Bolt

17 N·m

13 lb ft

< Message edited by Chevy Lover -- 4/5/2008 8:42:12 PM >

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(in reply to cbash1979)

Post #: 2

RE: looking for torque specs - 4/6/2008 12:00:29 PM

cbash1979

Posts: 21
Joined: 12/18/2007
Status: offline

quote:

ORIGINAL: Chevy Lover

Hope this helps
Fastener Tightening Specifications
Bearing Cap Bolts

75 N·m

55 lb ft

Differential Housing Cover Bolts (7.6" Axle)

30 N·m

20 lb ft

Differential Housing Cover Bolts (8.6" Axle)

39 N·m

29 lb ft

Fill Plug

33 N·m

24 lb ft

Pinion Shaft Lock Bolt (7.6" Axle)

34 N·m

25 lb ft

Pinion Shaft Lock Bolt (8.6" Axle)

36 N·m

27 lb ft

Ring Gear Bolts

120 N·m

90 lb ft

Vent Clamp Bolt

17 N·m

13 lb ft

thanks for the info now i can do it the right way this time.
what kind of back lash do i set the gears for if you know that? if there is any?

(in reply to Chevy Lover)

Post #: 3

RE: looking for torque specs - 4/6/2008 1:12:20 PM

swartlkk

Posts: 15304
Joined: 5/1/2005
From: Waterloo, NY
Status: offline

If you are reusing old gears and did not measure the backlash before you disassembled the diff, you are kind of out of luck. You could attempt to set back lash specs using the 0.005-0.009" backlash spec for new gears.

You need to first make sure that the gear pattern is centered on the tooth both forward and reverse. If it isn't, then you need to adjust your pinion depth. You should set pinion depth using an old crush sleeve as the spacer between the pinion bearings.

Once the pinion depth is correct, then you need to do the back lash test. You need to setup a dial indicator with the tip on one of the gear teeth. Move the ring gear until you are sure that it is hitting on the pinion gear and zero the indicator. Then, while holding the pinion gear fixed, rotate the ring gear until it contacts on the opposite side of the pinion tooth and note the backlash value. If it is outside of the spec, then you will have to move the shims side to side to bring it back into spec.

And that is provided that you already set the proper side bearing preload on the differential bearings.

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My Restoration Projects
Please Do Not PM for Tech Help

(in reply to cbash1979)

Post #: 4

RE: looking for torque specs - 4/6/2008 4:00:52 PM

cbash1979

Posts: 21
Joined: 12/18/2007
Status: offline

quote:

ORIGINAL: swartlkk

If you are reusing old gears and did not measure the backlash before you disassembled the diff, you are kind of out of luck. You could attempt to set back lash specs using the 0.005-0.009" backlash spec for new gears.

You need to first make sure that the gear pattern is centered on the tooth both forward and reverse. If it isn't, then you need to adjust your pinion depth. You should set pinion depth using an old crush sleeve as the spacer between the pinion bearings.

Once the pinion depth is correct, then you need to do the back lash test. You need to setup a dial indicator with the tip on one of the gear teeth. Move the ring gear until you are sure that it is hitting on the pinion gear and zero the indicator. Then, while holding the pinion gear fixed, rotate the ring gear until it contacts on the opposite side of the pinion tooth and note the backlash value. If it is outside of the spec, then you will have to move the shims side to side to bring it back into spec.

And that is provided that you already set the proper side bearing preload on the differential bearings.

well not using old gears ordered new gears from the local napa store and will be ripping my old set apart to put it all back together and install back into my 98 jimmy but wanted to know some specs on the back lash so i dont screw it up thanks swartlkk you have helpped emensly on this problem suv i have

(in reply to swartlkk)

Post #: 5