Drive shaft angle and overdrive

[JSabah]

I could use some advice on my Overdrive installation. I’m installing a Laycock OD (Denman set up) and am a bit confused on angles/phasing that I should use. I have not put my rear axle on the ground yet but attached are the angles I measured of the front and rear diffs as well as the transfer case. Also, is a drawing from another site that explains proper angles for the U joints and a coupe of pics of my installation so far. I don’t see how the rules can be maintained. Seeking advice as to the angle I should have on my OD so I can make the supports.

[JSabah]

My installation:

[Tom Petroff]

Dennan%20over%20mount%20004.jpgThe most important thing is to keep the OD straight inline, up/down, side to side with the T-Case output.
This keeps the U joint straight and no unnecessary loads on it.
Then the rear shaft is going to be what it is.

I have many miles on mine in 16 years of service with No problems.

Don't over Think it.

Tom
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[JSabah]

Perfect. Thank you.... and thanks for the picture. That helps with the bracket. How is your front bracket ? Is the OD hanging?

[Tom Petroff]

The front is hanging using the same rubber mount as the rear, only inverted.
I believe they are GM Automatic Trans. mounts, but can't remember exact year/model.
Tom