Installing 9" rearend

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Jan 25, 2010 | 10:57 AM

Pappys53

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Laughing Gas

Joined: Sep 2008

Posts: 966

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From: Missouri

Installing 9" rearend

I will be installing my 9" rear end this spring. I have a 350 with 350turbo tranny, will I need to do anything different with the drive shaft?

Jan 25, 2010 | 11:10 AM

fergusonicford

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Joined: Nov 2006

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yes; Length change and Universal Joint change. Check for length with vehicle on the ground; not up on jackstands. Be sure to have it Balanced.

Jan 25, 2010 | 11:11 AM

bobbytnm

Roast em' if you got 'em

Joined: Mar 2005

Posts: 22,017

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From: Rio Rancho, NM

Possibly, the two areas to look at would be the "U" joint and the length of the snout of the 9" as comparer to the original. I'm betting there isn't much difference between the snout lengths so its probably not an issue. If there is more than about an inch difference then it might be a problem and the driveshaft would have to be shortened a bit.

There is a chance the the "U" joint cross shaft dimensions will be different, if so you have several choices. The easiest is to buy a "U" joint with an offset cross. If you have to have the driveshaft cut down then it would be easy to add the correct size rear yoke. Or you can change the yoke out on the 9".

The place to start is to grab a tape measure and measure your "U" joint on your truck and the yoke on the 9"

Good luck
Bobby