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10-20-2005, 11:03 PM
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#1 |
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Registered User
Join Date: Dec 2004
Location: Where the hell is Bullhead City, Az? (USA)
Posts: 55
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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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-----the fleet----- '72 K20 Chevy Suburban '72 Datsun 510 (vintage racer) '89 Honda Civic Si HB '89 Honda Civic Dx HB '08 Honda Element EX-P '78 Honda Express (50cc. pit-ped) pix here 
Last edited by MrBinAz; 10-20-2005 at 11:04 PM. |
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10-21-2005, 03:52 AM
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#2 |
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Senior Member
Join Date: Dec 1999
Location: Saskatchewan
Posts: 1,050
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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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~70 GMCprostreet swb 396/700r NOS 575 hp "the Brick" ~72 chev swb w/68 front clip "GM Millenium corvette yellow" I use and accept Paypal |
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10-21-2005, 07:14 PM
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#3 | |||
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Registered User
Join Date: Dec 2004
Location: Where the hell is Bullhead City, Az? (USA)
Posts: 55
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Re: Need help 72 3/4 Ton 10 bolt rear diff.
Quote:
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:
Quote:
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-----the fleet----- '72 K20 Chevy Suburban '72 Datsun 510 (vintage racer) '89 Honda Civic Si HB '89 Honda Civic Dx HB '08 Honda Element EX-P '78 Honda Express (50cc. pit-ped) pix here
Last edited by MrBinAz; 10-21-2005 at 07:16 PM. |
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10-22-2005, 05:16 AM
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#4 |
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Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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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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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. Last edited by 4x4Poet; 10-22-2005 at 05:51 AM. |
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10-26-2005, 09:27 PM
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#5 |
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Senior Member
 Join Date: Mar 2003
Location: Virginia
Posts: 809
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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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10-29-2005, 07:28 PM
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#6 | |
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Registered User
Join Date: Dec 2004
Location: Where the hell is Bullhead City, Az? (USA)
Posts: 55
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Re: Need help 72 3/4 Ton 10 bolt rear diff.
Quote:
....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 
__________________
-----the fleet----- '72 K20 Chevy Suburban '72 Datsun 510 (vintage racer) '89 Honda Civic Si HB '89 Honda Civic Dx HB '08 Honda Element EX-P '78 Honda Express (50cc. pit-ped) pix here
Last edited by MrBinAz; 10-29-2005 at 11:45 PM. |
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04-24-2019, 01:52 PM
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#7 | |
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Registered User
Join Date: Sep 2017
Location: Cayuga Wisconsin
Posts: 34
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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:
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1972 K20 2004 Chevy Aveo 2011 BMW X5 Diesel 2018 Chevy Silverado Diesel  U.S. Air Force Retired - 1983-2017
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05-03-2019, 08:15 PM
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#8 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,723
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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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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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