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Thread: Any drivetrain angle specialists?

  1. #1
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    Any drivetrain angle specialists?

    Just measured my driveshaft and pinion angle on my car and found some surprising results! Running HardRace engine mounts and GKTech Solid Subframe mounts with 8mm spacers to the body, I thought it best to check to make sure the angles aren't massively out as I have been getting a lot of gearbox movement during launches on and off the drag strip which worries me.

    I zero'd the digital gauge on the gearbox and the prop and diff angles were as follows:-

    Gearbox: 0 degrees
    Front Prop: 3.9 degrees
    Rear Prop: 2.3/2.4 degrees
    Diff: 3.4 degrees

    So as I understand it, the total angle between the diff and the prop should be between 1 - 3 degrees on a single piece driveshaft. But having a 2 piece , working out what is right confuses me. I believe the rear prop to diff angle is fine but after looking around, I found someone mention that the gearbox to front prop angle should be 0 degrees still.
    If I'm correct and the Front prop angle is massively out, my plan was to make a number of shims to go between the gearbox mount and gearbox, lifting the gearbox and reducing the angle to as close to 0 as possible.

    Any input appreciated!

  2. #2
    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    Last edited by Actual_Ben_Taylor; 08-05-2021 at 16:06.

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    I just tried that app and it confirms what I thought but still been unable to find a definitive answer to the gearbox to front prop angle question. I did find this picture though which seems to show it needing to be straight.

  4. #4
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    Also, if what I've found is correct, this means that anyone running the same engine and gearbox mounts combo (HardRace OEM style) is also running almost +4 degrees extra front prop angle? That's got to be causing unnecessary wear on components in the driveline.

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