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Old 03-31-2016, 09:51 PM   #1
Bret B
Registered User
 
Join Date: Nov 2007
Location: Altus OK
Posts: 143
Need 9 inch installation information

A number of years ago, I posted on here that I swapped my original 1965 rear for a 1971 Suburban rear. The '71 is much wider than expected, and subsequently when I lowered the truck, the bed would sit on the tires them selves. Fast forward to current day, I have a 9 inch rear end sitting around which is out of what appears to be a 1979 F100 and measures 61 inches WMS to WMS. That is a good thing compared with the nearly 64 inches with the '71 rear. If I move forward with this installation, I'm guessing that there is going to be an offset from center line with the pinion? Meaning the pinion will not be centered in the frame because the 9 inch has an offset of something like 2 inches. Is that correct? The 9's axles are equal length, or at least they measured out the same length, I could be wrong, and I'll double check that. The 9's axle tubes are 3.01 inches diameter, which is correct for the u-bolts. Will the drive shaft u-joints deal with the offset for a 9 inch and the pinion angle without vibrating itself to death? I'm sure there are better 9 inch options out there for housings, but I haven't truthfully looked for any since I thought I had a "good" candidate with the one I have. The offset has me a bit perplexed.

So, if anyone has information pertaining to how they measured, and installed the rear, or even pictures, I'd really appreciate it. The debate over 12 bolt vs 9 inch is not something I would like to get into, I'm investigating all my options still. There are benefits and draw backs to both options. Regardless of which way I go, I need better gearing, would like a traction device, and better braking. Which means, both are open and viable options since both will require nearly the same work.

Appreciate any assistance with this endeavor.
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1965 Chevy short-step side, work in progress....
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