Pinion angle/Shim Axle/CV Shaft install

83 CJ7 w/ 4" lift installed.

Well, I have my CV Shaft back from the driveline place, the yoke installed, and so I go to put in the CV Shaft. Too Long. The driveline place created the shaft too long and they measured it. I called and they said no problem, measure and bring it in and they'll fix it no charge. Anyway, it was kinda a good thing because I had forgotten I still had the transfercase drop kit on the jeep when I had it measured the first time. So last weekend when I installed the yoke I took out the transfercase drop kit spacers. As a result though I noticed the pinion isn't pointing at the transfercase as nicely as it was before. The axle is shimmed at 4 degrees so looks like I need to increase that slope.

Question:

  1. With both of the yokes in a vertical orientation I measured from top to top and bottom to bottom. I got 23 3/8" at the top and 23 3/16" at the bottom. As I mentioned I have 4 degree shims in there now. Is there a way I can determine the degree value of the new shims to get the pinion more pointing to the transfer case? I have an angle finder but cannot find a good place to lay it for a clear determination. Anyway based on the numbers above can the increase in slope be determined?

Thanks,

Bill

Reply to
William Oliveri
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Reply to
L.W.(ßill) Hughes III

Hi Bill,

The measurements I have below are with the yokes both in vertical orientations, not horizontal, with no drive shaft installed. So I measured from the top to top and bottom to bottom arriving at the numbers below.

Regarding the pinion. How can I determine the shim degree value of the shim to correct the pinion slope? I guess since the only degree value above the current 4 degrees I have on there now is 6 degrees (that I can find in a shop locally), I could just get the 6 degree shims and try them since they're not that expensive for a pair.

Bill.

Reply to
William Oliveri

Hi William,

Assuming you were happy with the angle with a 4 degree shim and the one inch tcase drop, a very rough trig estimate suggests you should try a 6 degree shim without the tcase drop:

x = inv sin((23*sin(4))+1)/23.375) = 6.4 degrees

If you ever need to measure the slope of your pinion you can place the angle finder on the perpendicular flat surface that the diff cover bolts to.

Steve

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William Oliveri wrote:

Reply to
Steve

Reply to
L.W.(ßill) Hughes III

not sure....I think he's letting them hang down and so measuring them that way...hence vertical and the top/bottom measurements.

Reply to
SteveBrady

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