4 speed conversion HELP - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 16 (permalink) Old Nov 30th, 19, 11:48 PM Thread Starter
 
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4 speed conversion HELP

I converted my 72 ss Chevelle from a 7700r4 to an m20

I adjusted the clutch until the trans would change gears while at idle in my garage
I kept turning the adjusting rod until the trans would shift without grinding at idle in my garage

Just put on 50 miles worked perfectly and when I got to my garage the car won't shift into gear running
I have the pedal fully pressed it won't shift at idle
when the car is off it will shift all gears no problem

I think i have to adjust the rod more positive to allow the trans to shift into gear
possibly the clutch needs a break in adjustment
just wore in very strange any advice before I get under the car in the am and go at it
THANKs
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post #2 of 16 (permalink) Old Dec 1st, 19, 3:59 AM
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Re: 4 speed conversion HELP

I think mine has about 1 inch of free play before I feel the pressure plate. Then when I push down it gets close to the floor. Are you sure you have the right Pivot stud and or correct throw out bearing? Jim
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post #3 of 16 (permalink) Old Dec 1st, 19, 7:13 AM
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Re: 4 speed conversion HELP

John, it sounds like your clutch adjustment procedure isnt accurate enough. 1-1.15" of pedal travel before engagement is right. I do the other end; i seat the clutch rod into the bellcrank fully, and then back it off a few turns. Its maybe 20-30 thou of play , at that end. Hard to get a feel for it, frankly.

I also have a small hole drilled into my bell for an "airgap" adjustment. Maybe Jody or someone can tell us how to do that one! I was told it's supposed to be 0.080" is all I know.

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post #4 of 16 (permalink) Old Dec 1st, 19, 10:37 AM
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Re: 4 speed conversion HELP

Might not be an adjustment issue but an alignment issue. Did you have to persuade the last inch or so of seating the trans to the bell housing? If everything is lined up correctly the trans should seat by hand will little pressure.
As far as adjustment when pedal is at the top there should be approx 1/8 gap between throw out hearing and fingers on pressure plate.
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post #5 of 16 (permalink) Old Dec 1st, 19, 2:05 PM
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Re: 4 speed conversion HELP

how much free play do u have ?
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post #6 of 16 (permalink) Old Dec 1st, 19, 2:17 PM
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Re: 4 speed conversion HELP

there is a correct way and wrong way that your throw out bearing goes on, check to make sure it is correct if it is not it will cause the throw out bearing to not function proper
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post #7 of 16 (permalink) Old Dec 1st, 19, 5:34 PM Thread Starter
 
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Re: 4 speed conversion HELP

I know the throught ought bearing is correct

I am going to try to adjust the clutch from scratch

if this does not do it

I will pull the trans (big job more of a pita) and verify the throughout bearing is correct installed

Thanks

Worked before will work again

Last edited by 8453johng; Dec 1st, 19 at 5:35 PM. Reason: ok
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post #8 of 16 (permalink) Old Dec 1st, 19, 5:41 PM Thread Starter
 
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Re: 4 speed conversion HELP

Thanks Again I will attact the problem Monday

I will keep you informed
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post #9 of 16 (permalink) Old Dec 1st, 19, 6:23 PM
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Re: 4 speed conversion HELP

u need to go on utube and look up john kinslow on how to install clutch and set up clutch pivit ball it is very helpful i belive it will get u lined out good luck
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post #10 of 16 (permalink) Old Dec 1st, 19, 6:58 PM
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Re: 4 speed conversion HELP

Here's the throwout bearing pics.
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post #11 of 16 (permalink) Old Dec 1st, 19, 7:45 PM
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Re: 4 speed conversion HELP

What pilot bushing was used?
Hopefully not a metalic/bronze one.
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post #12 of 16 (permalink) Old Dec 1st, 19, 8:22 PM
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Re: 4 speed conversion HELP

When the car is running at idle and you have the clutch pedal to the floor does the car want to still move if you don't have your foot on the brake. If you have a magnetic pilot bushing or the clearance between the bushing hole and input shaft is not enough the input shaft could have seized to the pilot bushing which would cause the transmission to not stop spinning even though the clutch is pressed in.
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post #13 of 16 (permalink) Old Dec 1st, 19, 9:31 PM
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Re: 4 speed conversion HELP

I ask if he had to force the trans to seat (either clearance with pilot using or poor alignment) but OP did not respond to that question.
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post #14 of 16 (permalink) Old Dec 2nd, 19, 6:18 AM
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Re: 4 speed conversion HELP

My .02. When I did a M22 install on my 69 camaro, I had to do a fairly significant readjustment after about 50 miles just as you describe. All new parts. Once readjusted, no further adjustments in many thousands of miles. Hopefully it's something simple.

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post #15 of 16 (permalink) Old Dec 2nd, 19, 9:24 AM
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Re: 4 speed conversion HELP

Another thing to check is see how close to the floor the clutch is catching by pushing it in all the way and then easing it out in gear. If it's catching to close to the floor it will cause your problem also. I don't know if you had replaced the rubber bumper that the clutch pedal comes up and stops against but what they sell now are too thick. They should only be about 1/4" to 5/16" thick. Thinning them down gives you more pedal travel. It allows you to shorten the free travel which will become more by thinning the rubber bumper. You must do this which will cause your clutch pedal to catch higher off the floor.
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