How to adjust 4 speed linkage

Discussion in 'U-shift em' started by buick64203, Mar 23, 2020.

  1. buick64203

    buick64203 Just plum crazy Staff Member

    While my car is apart, I figured I'd post up a quick tutorial on how to adjust the rods on your factory 4 speed shifter.

    First thing is you need either the plastic Hurst tool or a 1/4 drill bit.

    20200320_171238.jpg

    Next you'll need to get under the car and put the shifter into neutral. This is what factory linkage looks like-

    20200320_171333.jpg

    If you look at the shifter mech, you'll see a 1/4" hole at the bottom. This is where the tool or the drill bit gets inserted. The tool lines up all the shifter levers in the mechanism.

    20200320_171353.jpg

    And a pic of the tool in the shifter. Naturally, this shifter is adjusted so the tool fits. If your shifter is out of adjustment, you may need to loosen up the adjuster nuts on the rods to get the tool installed.

    20200320_171416.jpg

    And a picture of the nuts loosened up on the rod. Make sure the trans levers are all in neutral as well.

    20200320_171501.jpg

    Now with the trans in neutral and the shifter itself in neutral, adjust the nuts against the trunion on the rods and tighten them up making sure you tighten then up evenly on both sides

    20200320_171602.jpg

    Do the same procedure for the 1-2 rod, the 3-4 rod and the reverse rod. And dont forget to take the tool or the drill bit out!! Your done!
     
  2. Buicksky

    Buicksky Silver Level contributor

    Jason ,
    Thank you I will need to follow this in the near future
    . If I have the trans out of the car can I mount the shifter on the trans and adjust it without the trans bolted to the bellhousing and engine ?
     
  3. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    I’m very familiar with this, especially after finding out why I couldn’t get the shifter linkage adjusted correctly. It helps to have the right mount :rolleyes:
     
  4. buick64203

    buick64203 Just plum crazy Staff Member

    Absolutely. Makes no difference
     
  5. You should make a video about adjusting the pedal free play and the lower clutch adjustment rod. There seem to be quite a few threads about trouble with that.
     
    STAGE III, tdacton and Brett Slater like this.
  6. 69GS&M21

    69GS&M21 Well-Known Member

    This is very helpful, and the pictures were great. Thanks for this thread! -- Jeff
     
  7. BuickV8Mike

    BuickV8Mike SD Buick Fan

    Hello Jason,
    I'm hoping you can help. After my last stop a the shop, ,my 4 speed is having trouble shifting into 1 and 3. :mad:

    I finished with the setting up you show above. It's a older shifter likely never rebuilt, but the shifter handle doesn't seem to "go far enough" to shift, still works but doesn't feel right. One of the shifter bars seemed bowed. I think they might have been a rod trying to pull it lot of "lock". Any ideas?
    Thanks, Mike
     
  8. buick64203

    buick64203 Just plum crazy Staff Member

    A picture might help mike. Maybe one of us can spot what's wrong. Is the shifter an aftermarket with stop bolts? Sounds like it could be. If the forward stop bolt is adjusted "in" too much, it could restrict the shifter from going into first and third fully
     
    Last edited: Mar 25, 2020
  9. STAGE III

    STAGE III Lost Experimental Block

    Okay I gotta follow this thread. Thanks Jason!
     
  10. BuickV8Mike

    BuickV8Mike SD Buick Fan

    Jason, is the support out for those adjustment shots you seem to have a lot more access than I do. :( to be clear it was working fine till the monkeys at the shop starting pulling on it. I'll try and get a picture. Anything common about 1 and 3 in the linkage or shifter?
     
  11. buick64203

    buick64203 Just plum crazy Staff Member

    I just edited my last post.

    Yes, its a little tight with the crossmember in place. My crossmemeber is currently out for powdercoating so it really opens up the area. Thats one reason I took the opportunity to make this thread
     
    STAGE III likes this.
  12. BuickV8Mike

    BuickV8Mike SD Buick Fan

    The shifter is an original Buick one. If the 1/2 rod and 3/4 rod were both bend and shortly could that explain this issue? Is there a pictorial of the level positions for 1, 2, 3, 4 & Reverse?
     
  13. buick64203

    buick64203 Just plum crazy Staff Member

    Well, the factory rods are pretty beefy. I would find it hard to believe that they got bent.
     
  14. BuickV8Mike

    BuickV8Mike SD Buick Fan

    I think mine a Chevy. :( A least the transmission ID that way.
     
  15. BuickV8Mike

    BuickV8Mike SD Buick Fan

  16. crash

    crash Well-Known Member

    1969 Camaro built in L.A.
    Hope this helps... Crash
     
  17. BuickV8Mike

    BuickV8Mike SD Buick Fan

    Any idea of the gearing/ratios? Thanks Crash! Mike

    Common?
     
  18. buick64203

    buick64203 Just plum crazy Staff Member

    It's a wide ratio with a 2.52 first
     
  19. BuickV8Mike

    BuickV8Mike SD Buick Fan

    Interesting. Thanks. Its easy not to use second gear actually. :)
     

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