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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!
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| | | | Joined: Sep 2004 Posts: 31 Apprentice | | Apprentice Joined: Sep 2004 Posts: 31 | Our 1948 6400 2ton firetruck differential is a RG429 single speed. Can anybody tell me what it is and what we can replace it with for higher ratio. Thanks | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy lutrexen, The stock rear end ratio is 6.17:1 which is pretty low, are you trying to get more top speed, if so I would suggest an overdrive transmission or an accessory overdrive, rather than a differential gear change. That particular rear axle housing probably has a limited number of ratio options available. You could possibly swap in a newer diff. from a diesel powered truck , which may have ratios in the 4-5:1 range, hope that helps. | | |
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