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Thread: Shimming Trans

  1. #1

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    Default Shimming Trans

    When I tighten my trans down to its mounting plate I'm ending up with a bit of a gap on the opposite side. So if I tighten my drive side I'm getting about .04" of a gap on the opposite side. Should I be shimming this? Also should I be tightening the front mounts first instead of the sides?

    Early 4 speed Trans and a new mounting plate from jp. Going to be an open belt for primary

    Also I've got a hunt mag that needs to go on, if anyone has a close picture of how exactly the hold down bracket get installed that would be a help.

  2. #2
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    You have no way of knowing where to shim if you don't have a motor plate or inner primary to position the trans in relation to the engine. But yes, I would shim it.

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    Also I've got a hunt mag that needs to go on, if anyone has a close picture of how exactly the hold down bracket get installed that would be a help.
    What engine?

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    if the trasmission will not sit squarly on the trans plate, I would say the trans plate is bent or warped,
    get the trans plate off & check it on a surface gauge, replace if it's not flat, not expensive & some good quality ones out there.
    but if damaged it can damage expensive parts...

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    Quote Originally Posted by Dylan529 View Post
    Early 4 speed Trans and a new mounting plate from jp.
    An old original HD plate would be much better.

  6. #6

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    Quote Originally Posted by tzienlee View Post
    if the trasmission will not sit squarly on the trans plate, I would say the trans plate is bent or warped,
    get the trans plate off & check it on a surface gauge, replace if it's not flat, not expensive & some good quality ones out there.
    but if damaged it can damage expensive parts...
    Couldn't they frame be bent instead of a bad plate?

  7. #7
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    not if when you fit the trans plate to the trans and it's rocking,
    it's meant to be flat !!...
    the mounting surface of the trans was milled flat during production. & as so the two should fit,
    if it's not sitting flat the trans plate, it must be bent or warped. unless the trans case is warped but if it was that bad the trans case would be cracked & the trans jammed up.
    or do you mean, when the trans plate is bolted to the trans, the assembly is rocking on the frame mounts?
    if the plate IS flat ( you MUST check it !!) & the transmission is flat on the plate, but is rocking in the frame, the frame could be bent.

  8. #8

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    Motor is from a 52 fl.
    What do you mean when you say motor plate?
    This is going to have an open drive on it.
    I guess I could check the mounting plate against a window for flatness..
    Even mount the Trans in it off the bike to see what that does and see if it sits flat...
    Frame is a 48 so it could very well be tweaked. If that's my issue could I shim the whole mounting plate ?

    What I'm trying to do right now is mount everything up so I can run the engine and trans. Once I have it sitting where I want I have some stuff to lay out then it will be removed again

  9. #9

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    Could be the plates flat and when I torqued it to the frame it twisted a bit or something . I'm going to pull it out tonight and see.

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    Quote Originally Posted by Dylan529 View Post
    What do you mean when you say motor plate?
    Where did he say that?

  11. #11

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    Something about That was mentioned in the second comment in

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    exactly where does it in your opinion need shimming?
    please post a photo.
    as I said, is it
    A)...between the plate & trans,
    OR....
    B)... between the plate & frame ????
    You must check the plate to see if it is flat

    if you blindly shim it you run the risk of getting the trans mainshaft not being Square to the crank pinion etc..... yes you shim a motor if needed but the trans should be ok seeing your plate should be flat,
    but if it's flat & rocking on the frame the frame might be bent.... PICTURES PLEASE
    Last edited by tzienlee; 10-18-2021 at 9:25 AM.

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    Quote Originally Posted by Dylan529 View Post
    Something about That was mentioned in the second comment in
    Yea I see it now since it was below tz post I figured you were asking him. Yea I agree with you.

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    you are meant to bolt the trans plate to the transmission BEFORE it's fitted in the frame,
    then you bolt the transmission & plate assembly in the frame
    you dont fit the plate to the frame & then the transmission to it, wrong way...

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    Quote Originally Posted by tzienlee View Post
    you are meant to bolt the trans plate to the transmission BEFORE it's fitted in the frame,
    then you bolt the transmission & plate assembly in the frame
    you dont fit the plate to the frame & then the transmission to it, wrong way...
    I guess I have done it wrong all my life. I would think it would be very hard to do on a swingarm bike.........

  16. #16
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    I may be Wrong Tattoo, but I do seem to remember having to bolt the plate to the trans before fitting, but it has been about 5 years since I had to remove a Trans,...but I do remember it was a pain in the ass....
    seem to remember you cant get to all the bolts if you do it the other way, been a while so might be wrong ? either way, the trans plate must be flat...

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    Quote Originally Posted by tzienlee View Post
    the trans plate must be flat...
    You got that right very flat......

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    1) Bolt/shim the motor in the frame
    2) Bolt the plate to the motor
    3) Set the trans in place and bolt it to the motor plate
    4) See what ya got

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    Quote Originally Posted by rockman96 View Post
    1)
    2) Bolt the plate to the motor
    What plate to the motor ?... he's talking Transmission plate

  20. #20

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    So I found a couple things.
    The cradle for the adjustment screw was holding up the back of the trans giving me a gap. Think I'll space the cradle down with a washer to give me a flush trans to plate.
    I also found that when I lay the plate by itself in the frame it makes contact across the front mount and also the rear left.
    So I'm left with a gap on the rear right that's in the pic
    Click image for larger version. 

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    Can I shim this between the frame and plate for a flush mount all the way around? The image is upside down.

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