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Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

Machine Shop and Tool Talk

Axle Shortening


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  #11  
Old 08-08-2018, 04:52:58 PM
kwfiggatt kwfiggatt is offline
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Default Re: Axle Shortening

Yep - max torsional stress is in the outer portion of the shaft. Torsional stress at the center is zero..
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  #12  
Old 08-08-2018, 05:52:16 PM
Charley K Charley K is offline
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Default Re: Axle Shortening

Hi, Back in the day, I narrowed several 9" ford rears. With 31 spline axels, you could cut the axel to length and re spline. The diameter was the same all the way to the flange. These held up well on the street hot rods. I have seen them twisted in the splines after many trips down the drag strip. They were not heat treated but did pretty well. The dana and 12 bolt rears took custom axels which were purchased from Moser. Good job, probably will work if they aren't abused. CK
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Old 08-08-2018, 06:04:01 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Axle Shortening

We raced a 55 Chevy in high school, used a 57 Pontiac rear end. We painted a stripe on the axle, would change them when it twisted 180 degrees. Most of the twisting occurred in the first foot from the spline.
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Old 08-08-2018, 08:41:28 PM
I like oldstuff I like oldstuff is online now
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Default Re: Axle Shortening

JB made a point. I used to run 9" 28 spline axles behind a Lincoln 430 in a Ford. Man that thing made torque! I also painted a line on the axles out of curiosity and when they'd pop they often had three to five revolutions of the line. That old 430 also shredded spider gears and back then a new bone yard carrier was only $15. It also ate 3600 pound Scheifer pressure plates. It wasn't that fast but up to 90 it would out grunt almost everything.

I ran into a guy that had a bunch of NASCAR heads, manifolds etc, that I bought for a pittance. That stuff really woke it up.
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Old 08-08-2018, 09:09:53 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Axle Shortening

Reading about drilled axles, .875" hole weakens them 20 percent, guessing the axles are 1.25"- 1.50" diameter.
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