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Old 10-20-2005, 11:03 PM   #1
MrBinAz
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Need help 72 3/4 Ton 10 bolt rear diff.

Specifically......there appears to be some sort of an (exterior) adjustment bolt (w/locknut) for the ring gear or ? , anyone know how to go about adjusting it? Will post a pic if needed.
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pix here

Last edited by MrBinAz; 10-20-2005 at 11:04 PM.
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Old 10-21-2005, 03:52 AM   #2
bowtie
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Re: Need help 72 3/4 Ton 10 bolt rear diff.

interesting, please post a pic. thanks
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Old 10-21-2005, 07:14 PM   #3
MrBinAz
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Re: Need help 72 3/4 Ton 10 bolt rear diff.

Quote:
Originally Posted by bowtie
interesting, please post a pic. thanks
Did some looking around and found this thread here......http://67-72chevytrucks.com/vboard/s...d.php?t=172827 ....

pix of the diff...... not mine, but mine is the same as in the above thread as shown below...

and


very good info in the thread for brakes and bearings and i.d. ......a few people did hit on the subject that I have in question, and refer to it as .....
Quote:
the pinion load bolt
and
Quote:
the ring gear deflection load bolt
This pretty much i.d.'s the rear as an Eaton H052.....size brakes I don't know.....but I goofed and messed with the "bolt" and have a pretty good "howl" coming from the rear.....
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pix here

Last edited by MrBinAz; 10-21-2005 at 07:16 PM.
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Old 10-22-2005, 05:16 AM   #4
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I'm pretty sure that you have moved the bolt into constant contact with the back side of the ring gear during normal torque loads. The ring gear deflection load bolt is there to keep the ring gear from, well, deflecting. As in the ring gear bending back away from the pinion which would misalign the two gears and enhance the chance of gear teeth stripping or the pinion breaking.

The deflection bolt generally should be adjusted so that the ring gear only hits it under severe shock loads. But I'm no R&P setup expert. I recommend immediately backing off the bolt until it no longer contacts the ring gear under load, but you might consider having an expert adjust it. If you take the cover off, you should have an easier time hearing whether the deflection bolt is in contact with the ring gear under no load.

Also, look at the back side of the ring gear for scoring. In fact, I'd like to see pics of that. Never seen a load bolt score an Eaton ring gear, before.

BTW. Ever heard the phrase, "If it ain't broke, don't fix it"?
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Old 10-26-2005, 09:27 PM   #5
Ridgeback
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Re: Need help 72 3/4 Ton 10 bolt rear diff.

MrBinAz

Following is the adjustment procedure for the ring gear thrust pad, taken from the Chevrolet Chassis Overhaul Manual. If you post your email I can also send you a picture of Figure 51 referenced in the adjustment procedure.


RING GEAR THRUST PAD ADJUSTMENT
(5,200, 7,200, 11,000, 15,000 and 17,000 Lb. Axles)
1. Inspect bronze tip of thrust pad and if worn install a new
one.
2. Install thrust pad and tighten screw until bronze tip
engages back face of ring gear while rotating gear.
3. Back off screw one-twelfth (1/12) turn and tighten lock-
nut to specifications (fig. 51).

NOTE: Make sure screw does not turn during lock-
ing process. This adjustment provides .005,, to .007
clearance between thrust pad and ring gear face.
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Old 10-29-2005, 07:28 PM   #6
MrBinAz
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Re: Need help 72 3/4 Ton 10 bolt rear diff.

Quote:
Originally Posted by Ridgeback
MrBinAz

If you post your email I can also send you a picture of Figure 51 referenced in the adjustment procedure.

....Thanks for the help guys.......... this is exactly why I decided to come here and post up.

Ridgeback.....find me here >>>> norb at citlink dot net
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'89 Honda Civic Si HB
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'78 Honda Express (50cc. pit-ped)

pix here

Last edited by MrBinAz; 10-29-2005 at 11:45 PM.
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Old 04-24-2019, 01:52 PM   #7
USAF
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Re: Need help 72 3/4 Ton 10 bolt rear diff.

Ridgeback,
Is this referencing the pinion pre-load bolt? I messed up and removed the pinion pre-load bolt thinking it was the drain. Now I'm not sure of I got it back exactly where it was. If your procedure is referencing the pinion pre-load it should be easy to get it back to correct. Thanks.

Quote:
Originally Posted by Ridgeback View Post
MrBinAz

Following is the adjustment procedure for the ring gear thrust pad, taken from the Chevrolet Chassis Overhaul Manual. If you post your email I can also send you a picture of Figure 51 referenced in the adjustment procedure.


RING GEAR THRUST PAD ADJUSTMENT
(5,200, 7,200, 11,000, 15,000 and 17,000 Lb. Axles)
1. Inspect bronze tip of thrust pad and if worn install a new
one.
2. Install thrust pad and tighten screw until bronze tip
engages back face of ring gear while rotating gear.
3. Back off screw one-twelfth (1/12) turn and tighten lock-
nut to specifications (fig. 51).

NOTE: Make sure screw does not turn during lock-
ing process. This adjustment provides .005,, to .007
clearance between thrust pad and ring gear face.
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Old 05-03-2019, 08:15 PM   #8
Mike C
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Re: Need help 72 3/4 Ton 10 bolt rear diff.

Just make sure it's not too tight. It's designed for vehicles operated at max load and full throttle for long durations. (Read dump truck running up hill fully loaded) It's really a non issue in a people mover like a Sub even with a full load.
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