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Mod | | | Forums66 Topics128,089 Posts1,056,117 Members48,434 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2007 Posts: 18 New Guy | | New Guy Joined: Nov 2007 Posts: 18 | I have a rear end from a 69 c-10 and would like to know what gear ratio I have. ID# on rear end are NF896838, also GM52, and hand stamped on the axle are HB0423W. Any help will really be appreciated.
Squeegebob
| | | | | Joined: Dec 2005 Posts: 547 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 547 |
58' 3200 235 3-speed/OD
| | | | | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | When all else fail:
Jack up one rear wheel, put the tranny in neutral. With masking tape or chalk, mark the tire, and the driveshaft. Rotate the tire 20 times while counting the number of rotations the driveshaft makes. Divide the driveshaft rotations by 10 and you've gor your gear. (driveshaft turns 41 times, they're 4:11's)
If it's a posi (the one wheel that's jacked up won't turn)jack up both rear wheels, do the drill again only rotate 10 times and divide by 10.
Works every time!! | | | | | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | HB is the code for a 3.07:1 gear,
Scott | | | | | Joined: Nov 2007 Posts: 18 New Guy | | New Guy Joined: Nov 2007 Posts: 18 | Thanks guys! It sure is nice to have access to all this knowledge.
Squeegebob
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