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  •  » Driveline angle help

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    2/08/2020 4:25 PM  #1

    mark1965
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    Registered: 4/03/2013
    Posts: 172

    Driveline angle help

    Chasing down a vibration in my 65 coupe 302 engine AOD transmission

    Measuring the driveline angles need some advice on measuring the angle of the  universal in the rear end if I rotate the rear end yolk and get the measurement from the flat surface on the bottom of the yolk I’m getting up 6.4° But if I measure from the universal joint and I’m getting up 2.4

    Just wondering if anyone knows which of those two measurements I should use I took a level and verified that the   yolk of the rear end is pointing up  towards the transmission and I used Spicer’s Driveline calculation chart   And according to my measurements either way the angle on the rear end driveshaft is way out of line

    My measurements are

    Crankshaft Pulley  3.4° down
    Drive shaft 1.8° down
    Once I figure out the actual rear end number I can make my adjustments accordingly thanks

     

    2/08/2020 7:30 PM  #2

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,282

    Re: Driveline angle help

    Best place is across the flat surface on the yoke where the u-bolt holes are. Be sure your measuring device is vertical.

    Engine down 3.4 sounds about right if using an aftermarket crossmember that relocates the tranny down a bit.

    If rear end points upward at least two degrees, you should be ok.  Some will say to make them equal, but under hard forces of high speed or hard launch, the rear end will rotate upward a couple of degrees, equaling things out at the times when it matters most.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    2/09/2020 9:14 AM  #3

    mark1965
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    Registered: 4/03/2013
    Posts: 172

    Re: Driveline angle help

    Thanks Steve  I’m getting so much information looking on the web trying to find the proper angles to make the driveshaft in the universal joints happy if you look at Spicer‘s calculation chart they’re saying each joint should be   No less than 0.5  and no more than  1.5° if I use the calculator with my measurements now my pinnion joint is at 4.3° up which puts me over their specs I believe my vibration may be coming from that joint just want to be sure before I make any changes

       •Thread Starter
     

    2/09/2020 7:30 PM  #4

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,282

    Re: Driveline angle help

    Tapered shims are cheap and easy. Then fix it properly if you find an angle that works better.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    2/09/2020 9:55 PM  #5

    Bolted to Floor
    Senior 24-7 FYI Addict

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    From: Houston, Texas
    Registered: 4/01/2013
    Posts: 2,017

    Re: Driveline angle help

    Just an FYI.....Tremec Tool Box is a smart phone app that allows you to use a smart phone to determine the angles on the tranny, drive shaft, and the rear end then gives you a pass fail rating. If you're good, you're good. If its not good, the app won't tell you how to fix it!!

    John  -- 67 Mustang Coupe 390 5 speed
     

     

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