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Old 04-07-2003, 09:58 AM
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Post rear axle to frame clearance

How much frame to top of rear axle clearance is needed? Vehicle is a 39 chev truck and I wont be hauling anything. The frame rails are not very tall in that area maybe 3 1/2 inches, will c notching weaken the rails to much?

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Old 04-10-2003, 04:55 PM
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Generally speaking, 3-4 inches travel room up for the rear axle is sufficient. C notching the frame is a bad idea. We used to do that on race cars for them to be able to collaps easier when impacted from the rear. It will drastically weaken the frame in the rear.
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Old 04-11-2003, 08:05 AM
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Thanks adtkart, I have about 3 1/2 to 4 inches. Maybe it would be a good idea to place a small rubber bumpstop on the frame.

Anybody know where I could pick up some small stops?
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Old 04-11-2003, 09:41 AM
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Summit Racing at www.summitracing.com has them in many sizes and for many applications
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Old 04-11-2003, 03:14 PM
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I have run 4" clearance on my 36 Ford Pu and have not had a problem and had a 1 1/2" bumper installed. There was minor evidence it was bumping ocasionaly, but I never felt it in the truck. I have replaced the leaf spring suspension with triangulated 4 bar and coil overs and put it to the same clearance.

Trees
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Old 04-12-2003, 11:31 AM
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Trees Do you have that clearance with the bumper installed, or is that to the frame? If that is to frame, is it now bottoming out on the bumper? Doesn't seem like much clearance.
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