Help identifying rear diff/axle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Buda63 · 08-05-2017, 03:27 PM

Hello Everyone

I picked up a 1962 C-10 a few weeks ago and noticed the speedometer gear housing was leaking fluid. I pulled the housing to realize it was cracked (plastic). I would like to replace the housing and also confirm the gears needed. I currently have a red 17 tooth gear drive and would like to match it with the correct driven gear. To do this I am trying to determine what rear diff I have. I know it is a 10 bolt but I cannot locate the ID numbers on the passenger side axle. Can anyone provide some help? I did note a code "MA 403" shown in the red circle. Does that mean anything?

Thanks for the help.

cb1965 · 08-05-2017, 03:40 PM

I believe its an Eaton HO32

**Captainfab** · 08-05-2017, 11:37 PM

That is correct.

Quote:

Originally Posted by cb1965

I believe its an Eaton HO32

It more than likely has 3.90 gears as that is the most common. The only other ratio it could be is 3.38. If you want to know for sure, simply pull the rear cover. The gear oil more than likely needs to be changed as differentials are one of the most neglected parts of a vehicle. All it will cost you is a cover gasket and a couple quarts of 75W90 gear oil.

Buda63 · 08-06-2017, 04:59 PM

Thanks for the help. Another puzzle solved with this Frankenstein truck.

**Clyde65** · 08-06-2017, 06:30 PM

Not Frankenstein with that, 60-62 had those and some earlier too.

**Captainfab** · 08-06-2017, 11:34 PM

The Eaton HO32/33 differential was used from '55 second design thru '62.

08-05-2017, 03:27 PM	#1
Buda63 Registered User Join Date: Jul 2017 Location: Buda Tx Posts: 26	Help identifying rear diff/axle Hello Everyone I picked up a 1962 C-10 a few weeks ago and noticed the speedometer gear housing was leaking fluid. I pulled the housing to realize it was cracked (plastic). I would like to replace the housing and also confirm the gears needed. I currently have a red 17 tooth gear drive and would like to match it with the correct driven gear. To do this I am trying to determine what rear diff I have. I know it is a 10 bolt but I cannot locate the ID numbers on the passenger side axle. Can anyone provide some help? I did note a code "MA 403" shown in the red circle. Does that mean anything? Thanks for the help. Attached Images

08-05-2017, 03:40 PM	#2
cb1965 Registered User Join Date: Mar 2010 Location: san jose, california Posts: 508	Re: Help identifying rear diff/axle I believe its an Eaton HO32 __________________ '66 chevy lwb c10 '65 chevy lwb c20

08-06-2017, 04:59 PM	#4
Buda63 Registered User Join Date: Jul 2017 Location: Buda Tx Posts: 26	Re: Help identifying rear diff/axle Thanks for the help. Another puzzle solved with this Frankenstein truck.

08-06-2017, 06:30 PM	#5
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,549	Re: Help identifying rear diff/axle Not Frankenstein with that, 60-62 had those and some earlier too. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

08-06-2017, 11:34 PM	#6
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,254	Re: Help identifying rear diff/axle The Eaton HO32/33 differential was used from '55 second design thru '62. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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