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Lightweight driveshaft options?


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Any aircraft supply Co will have aluminum in different sizes, shapes and grades. If I remember right Lamborgini P400S had an aluminum driveshaft. Goodluck finding one of them in the JY. If you have a military facility or tech type colledge close by check when they have surplus auctions. Get lots of good stuff there.

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Well what if I was tossing a ford explorer 8.8 in the rear - should I not bother with the driveshaft adapter and see about running a ford driveshaft?

 

 

I don't understand the question. You'll still need a flange adapter. either the bigger Explorer on or the smaller Jeep one.

 

 

The cop crown vic driveshaft idea sounds intriguing. IIRC, the crown vic uses the correct Jeep u-joint size on their version of the 8.8 and if everything works out right, you just need to grab a couple of cop crown vic driveshafts and have them shortened together (and get the proper 8.8 flange adapter at the same time). car-part.com shows a gazillion of the things available across the country.

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The cop crown vic driveshaft idea sounds intriguing. IIRC, the crown vic uses the correct Jeep u-joint size on their version of the 8.8 and if everything works out right, you just need to grab a couple of cop crown vic driveshafts and have them shortened together (and get the proper 8.8 flange adapter at the same time). car-part.com shows a gazillion of the things available across the country.

 

I researched driveshaft donors extensively a little while back. Unfortunately, the aluminum crown vic DS use a slightly larger U-Joint. Ford Aerostars are another example. The regular (steel) crown vic DS uses the same 1310 Series U-joints. One could run "bastard" u-joints to use the aluminum ones, however.

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Well what if I was tossing a ford explorer 8.8 in the rear - should I not bother with the driveshaft adapter and see about running a ford driveshaft?

 

AFAIK, Ford never used an alloy RWD driveshaft w. 1310 u-joints. Your best bets for a lightweight shaft are all GM. The early (94 and below 1st generation models; the later models had 2-piece shafts) S10s or S15s, or the 93-94 up Chev pickups or Suburbans. All will have to be shortened for your MJ and may or may not need new yokes depending on spline count and u-joints. There's no stock lightweight bolt-in driveshaft available for the MJ that will not require modifications that I have found.

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Why? And what is a comanche group 2 rally truck :dunno:

Why am I looking for a lightweight driveshaft? Trying to reduce rotational mass as much as possible to free up as much horsepower to the wheels as possible (within reason, I'm no going to spend a million dollars on this).

 

Rally is: http://rally-america.com/whatis.php

Group 2 is a class for 2wd, with under 3 liter, naturally aspirated motors.

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