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dcmalone · 01-01-2012, 08:04 PM

The rearend casting numbers on the truck to be exact. While totally re-doing the rear brakes on my 1955 2nd I noticed a little bit of a drip from the pinion. In an attempt to find a replacement seal at Autozone I was asked if it was a HO33,HO35, HO 52, HO 72, Spicer 45, etc. Honestly I have no idea what the difference is and no idea what I need. It's a stock 10 bolt. I did however find the only numbers apparently on the center section:

3707340
D1

Does anyone have any idea what these mean or what it translates to in terms of HO33, etc? I have searched this and several other forums with no real luck. Any help would be appreciated.

01-01-2012, 08:04 PM	#1
dcmalone Registered User Join Date: Aug 2011 Location: Nashville, TN Posts: 97	Rearend Help for a 1955 2nd The rearend casting numbers on the truck to be exact. While totally re-doing the rear brakes on my 1955 2nd I noticed a little bit of a drip from the pinion. In an attempt to find a replacement seal at Autozone I was asked if it was a HO33,HO35, HO 52, HO 72, Spicer 45, etc. Honestly I have no idea what the difference is and no idea what I need. It's a stock 10 bolt. I did however find the only numbers apparently on the center section: 3707340 D1 Does anyone have any idea what these mean or what it translates to in terms of HO33, etc? I have searched this and several other forums with no real luck. Any help would be appreciated.