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Old 09-15-2002, 09:45 PM
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Post 9" Swap

I've purchased a narrowed (52")9" housing, Detroit Locker and related parts to put under my Nova. My question is, should I be concerned about the pinion offset to one side or the other, or just center the housing aligned with the transmission output shaft?

I'm using the leaf spring setup for now, and intend to relocate the spring pads and shock mounts, so theres no need for a locater or track bar right?

Somewhere there must be a technical article for this or a similar swap. Anyone know of a link to one?

Ahh, and who can fill me in on the pinion angle issue?

Thanks, Larry

[ September 15, 2002: Message edited by: 68NovaSS ]</p>

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Old 09-16-2002, 12:15 AM
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  • Center the housing in the chassis...
  • No track bar needed...
  • This is a pretty straight swap...

-Pinion Angle Theory-
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Old 09-16-2002, 04:13 AM
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Question

How you mount the housing depends on how it was narrowed. If it was narrowed with one axle tube longer than the other as it should have been then you can center the pinion shaft but if both axle tubes are the same length you are going to have to offset the pinion to center the tires in the wheel wells. I've forgotten the exact amount but its somewhere around 3 or 4 inches.

The driveline has enough angles to deal with without inducing yet another, and the pinion yoke should always be centered for that very reason. It's better on "U" joints and there is much lower chance of driveline vibrations.

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Old 09-16-2002, 06:20 AM
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You will get many different ideas from many different people. One thing for sure though, the vertical angle is more important than horizontal. The basic formula: "U-Joint angles in the vertical plane need to be 0.5 to 3.0 degrees and also need to be within one degree of each other." This is per tech article from Hemmings Rods & Performance, September issue on sale now. There is a complete article entitled "Driveshaft Science" that is very informative. I have a 35 ford that I narrowed down a ford 9" for and left the offset intact. (If you center the housing, this is what you get.)
From what feedback I have received, this is not a problem unless you get clearance problems with driveshaft tunnel in some old cars). The car is not running yet so I can't give you any real down the road feedback, but many cars came from the factory with horizontal offsets. After all, what's a U'Joint for if not to handle angles not exactly the same. Read the article, and it should clear things up&gt; Good Luck
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