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Old 11-05-2005, 11:16 AM
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Carrier bearing preload?

Accurately measuring pinion bearing preload is easy, use an in/lb torque wrench. What about carrier bearing preload? Is it how hard you have to push the shims in? Do you measure total rotating torque less the pinion torque? or is there a measurement for total assembly rotation, including ring and pinion?
If someone has a good answer, I'd appreciate it. This is on a Dana 35 w/trak-lok.
Thanks.

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Old 11-05-2005, 04:46 PM
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You set your backlash with no preload on the carrier bearings, Then you add something like 25thou. to the thickness of each shim to each side to get your preload. I can't remember what the exact thickness is for the GM diffs I have done, or if it's the same for all hotchkiss style differentials. But that's how you set carrier bearing preload, on a hotchkiss diff.
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Old 11-05-2005, 11:36 PM
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Quote:
Originally Posted by smallblocker2
You set your backlash with no preload on the carrier bearings, Then you add something like 25thou. to the thickness of each shim to each side to get your preload. I can't remember what the exact thickness is for the GM diffs I have done, or if it's the same for all hotchkiss style differentials. But that's how you set carrier bearing preload, on a hotchkiss diff.
...........LOL...........
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Old 11-06-2005, 04:25 PM
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You like that eh.
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Old 11-07-2005, 11:26 PM
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This is for a Ford, but it will give you a generalized idea of what is happening.

http://www.streetrodstuff.com/Articl...rain/Rear_End/

Set the lash, and then snug each bearing retainer an equal amount until proper total rotational torque is acheived.... by using a torque wrench.. and maintaining the proper backlash.

I'd bet that the difference in torque readings between the Dana and the Ford is minimal/ insignificant...... "Bearings is Bearings, Forrest."

Last edited by xntrik; 11-07-2005 at 11:31 PM.
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Old 11-08-2005, 06:37 PM
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The dana doesn't have a removable pumpkin like ford 9in's and toyota's do. The width is machined into the housing, and the carrier must be sandwiched in to get bearing preload.
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Old 11-08-2005, 11:31 PM
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Quote:
Originally Posted by smallblocker2
The dana doesn't have a removable pumpkin like ford 9in's and toyota's do. The width is machined into the housing, and the carrier must be sandwiched in to get bearing preload.
Right,
the point I so poorly presented was.....

For our intents and purposes:
Set up procedure is pretty much the same, it is just adjusted in a different manner with different designs, and.......

Overall rotational torque will be about the same regardless of which design rear end it is..... they all have about the same size pinion bearings and carrier bearings ...

(Disclaimer = Now if you get into BIGger stuff like 18 wheelers.. ya, the torque will be higher. So somebody don't jump me about 1 ton trucks or something) LOL
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Old 11-09-2005, 05:18 PM
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bearing preload

Yes there is an easy way to tell if you have the proper preload on the side bearings. Here is the formula.

Total preload (in/lbs. with the unit totally assembled) minus the pinion bearing preload (with only the pinion assembly) multiplied by the gear ratio = side bearing preload.

If your total preload is 32 in/lbs - pinion preload of 25 in/lbs = 7 in/lbs x ratio of 3.73 = 26.11 in/lbs side bearing preload.

I learned this from an awesome GM teacher and it works great. I have the procedure for the complete shim set up also but on a different computer. I can get it to you later if you would like.

Rick
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Old 11-09-2005, 07:15 PM
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I would like.
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Old 11-09-2005, 07:18 PM
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I set pinion bearing preload at 12 in.lbs What's the Ideal side bearing preload in in.lbs
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Old 11-10-2005, 09:15 AM
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Quote:
Originally Posted by Ricky Rocket
Yes there is an easy way to tell if you have the proper preload on the side bearings. Here is the formula.

Total preload (in/lbs. with the unit totally assembled) minus the pinion bearing preload (with only the pinion assembly) multiplied by the gear ratio = side bearing preload.

If your total preload is 32 in/lbs - pinion preload of 25 in/lbs = 7 in/lbs x ratio of 3.73 = 26.11 in/lbs side bearing preload.

I learned this from an awesome GM teacher and it works great. I have the procedure for the complete shim set up also but on a different computer. I can get it to you later if you would like.

Rick
Yes thank you for the information.
x
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Old 11-10-2005, 11:35 AM
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rear end

Here is my procedure for setting up a shim type differential and it comes right from a great GM Instructor. The procedure calls for using shims to position the case for proper backlash and side bearing preload (you would need a complete set of shims to do this). If you think you can use your original shims, there is some info in here that might be helpful as well. If your preload, backlash, and contact pattern are all OK, your diff should give you many trouble free miles of operation! Also, this works on GM differentials and others may work with some variations, I am not sure on the others.

Rick


DIFFERENTIAL REPAIR PROCEDURE
(INTEGRAL TYPE)



1. Remove cover - allow oil to drain.
2. Clean teeth with solvent, check tooth contact pattern, and record.
3. Check backlash in 3 spots around ring gear (general specification is .005" to .009" with no more than .002" variation).
4. Check ring gear runout (.003" maximum).
5. Remove axles.
6. Check total preload and record.
7. Mark and remove side bearing caps.
8. Measure shims on both sides and record.
9. Check pinion bearing preload and record.
10. Inspect all bearings, races, and gears for pitting or other damage.
11. Replace pinion bearing races (if required).
12. Check pinion depth with special tool (if available).
13. Replace pinion bearings with correct pinion depth shim in place (lube bearings lightly).
14. Install pinion gear, new crush sleeve, front bearing, seal, yoke, washer and nut.
15. Tighten pinion nut until proper pinion bearing preload is achieved and record (should be 15-20 lbs./in. for used bearings and 20-30 lbs./in. for new bearings).
16. Replace side bearings and races (lube lightly).
17. Hold ring gear and differential case assembly in place.
18. Temporarily place a waved shim (.040") on outside of right side bearing race.
19. Pack left side bearing with shims until zero backlash is obtained.
20. Pack right side bearing to zero preload (remove waved .040" shim).
21. To set backlash and side bearing preload subtract .004" from left shim pack and add .012" to the right shim pack
22. Install side bearing caps and torque bolts to specifications.
23. Check backlash in 3 places and record (should be .005" to .009" with less than .002" variance).
24. Check total preload and record.
25. Use the following formula to check side bearing preload. Total preload - pinion preload = _______ x axle ratio = side bearing preload.
26. Side bearing preload should be 15-30 lbs./in. for new bearings.
27. Use gear marking compound and check the gear tooth contact pattern to double check setup.
28. If backlash and side bearing preload is within specifications, finish assembling the remaining parts, torque all fasteners to specifications.
29. Add the correct lubricant and road test vehicle to confirm the repair.






Original Measurements

Gear contact pattern OK______Not OK_______Explain:

Backlash:

Ring gear runout:

Total preload:

Side bearing shim totals - Left side__________ Right side__________

Check pinion bearing preload:

Pinion depth shim thickness:

Parts needed:





Reassembly Measurements

Pinion depth shim needed:

Pinion bearing preload:

Side bearing shim totals - Left side__________ Right side__________

Total bearing preload:

Use formula to figure out side bearing preload.


Total preload - pinion preload = ________ x axle ratio = side bearing preload.

__________ - ___________ = ________ x ________ = ____________

Side bearing preload:

Check backlash:

Check ring gear runout:

Check gear tooth contact pattern. OK_____ Not OK_____. If not OK, Re do the setup.

Last edited by Ricky Rocket; 11-10-2005 at 11:47 AM.
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