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#1 |
Registered User
Join Date: Jan 2010
Location: Richfield, Oh
Posts: 5
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GMC GM drop out thrid member REAR END ID question
Ok the drop out is a 1964 date code on the ring gear
AXLE spline is coarse ring and pinion ratio trying to remember (8 on the pinion 36 on the ring ) 4.50 ratio??? maybe a few teeth off Anyway it have a 10" ring gear + or - a 1/4" ish has a bolt in pinion from the front like FORD 9" (5 bolts) Ring gear bolts are on the inner diameter of the ring gear NOT in the traditional late model back side of the ring gear behind the ring gear teeth (IE 12 bolt chevy 10, bolt 8.5 etc. ) Does have the fifth bearing like a Ford 9" also BUT bigger. Does this sound like a c30 c40 c50 c60 truck rear? I have casting numbers i can get too if that helps. Jim Thanks everyone |
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#2 |
Registered User
Join Date: Apr 2007
Location: Elk Grove, CA
Posts: 375
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Re: GMC GM drop out thrid member REAR END ID question
I know a guy who used one of these in his rock crawler. I don't know much about them other than they did come in 3/4 ton pickups and up. Correct they are factory 4.56 gears, and from what I recall he had a hell of a time locating pinion bearings for it, or they were extremely expensive, I forgot. But that is a BAD A$$ rear end my friend. Wouldn't necessarily put it in anything 2wd but definitely a 4wd beast. I'm sure there are plenty of people on here that can tell you more.
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1964 C10 Shortened Shortbed Cammed LQ9 P&P 1967 C10 Trophy Truck BB 438 (soon to be worked on again) |
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#3 |
Registered User
Join Date: Jan 2010
Location: Richfield, Oh
Posts: 5
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Re: GMC GM drop out thrid member REAR END ID question
Yha they are MONSTER axles even though they are coarse.
SEEMS to be built like a TANK. Jim This guy has it at his house and needs to unload the ring gear does have some slight chipped teeth but it is a locker. So if you know of anyone wanting this let me know I will forward the phone number. I will try to get pictures. Jim |
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#4 |
Registered User
Join Date: Apr 2007
Location: Elk Grove, CA
Posts: 375
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Re: GMC GM drop out thrid member REAR END ID question
I don't really know of anyone needing one at the moment. I'd post something up in the 4x4 section or could be a good craigslist item. Forgot about the locker thats another plus to these axles
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1964 C10 Shortened Shortbed Cammed LQ9 P&P 1967 C10 Trophy Truck BB 438 (soon to be worked on again) |
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#5 |
Registered User
Join Date: Jan 2010
Location: Richfield, Oh
Posts: 5
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Re: GMC GM drop out thrid member REAR END ID question
Yah I just want to get as much info on it as possible so IF I have to ship someone does not say it is not what was listed correctly...lol. YOU know how that goes. Jim
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#6 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: GMC GM drop out thrid member REAR END ID question
What you are describing would be the Eaton HO52 or the HO72 rear differential. Yes they are tough as h**l and parts are hard to find and/or expensive.
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