what is the use of stop bolts on the hurst shifteR?? i just adjust them before installing my rebuilt M21 in the car and now the third speed doesn't engage fully. I will unbolt the stop bolt one turn in order to gain full gear engagement.

THough i don't see why those stop bolts are needed...

The stop bolts are there to eliminate over shifting the gears on the main shaft. To properly adjust them, loosen both bolts, step on clutch pedal (set e-brake first!)push shifter into first gear firmly but do not force it. Tighten the rear stop bolt until it just touches the linkage, now tighten the jam nut. Now put the shifter in second and repeat the process with the front bolt. This is all assuming that you installed the shifter corectly using the nylon alignment pin that goes therough the shifter body. If not do that first. Remove the shifter arms from the trans, insert the pin through the notch in the shifter body, now with the trans levers set in the neutral (center) position, re install the arms to the trans. If the arms do not slip over the studs on the trans lever rotate the rods to make them fit. Remove the pin and re-adjust the stops. Should be perfect now!

This is from the Hurst web site:

Q. What is the proper way to adjust my Hurst four speed shifter?

A. There is a 1/4 inch hole at the bottom of the Hurst mechanism that runs through all three levers. This is called the neutral alignment hole. To ensure proper adjustment, run the shifter from first into second and then back to neutral. Insert the neutral alignment pin (or a 1/4 inch drill bit) into the neutral alignment hole. If the 1-2 lever interferes with the smooth insertion of the alignment pin, remove the 1-2 linkage rod from the shifter and thread the adjuster button either in or out to eliminate the interference. Repeat this procedure with the 3-4 lever and reverse. To adjust the stop bolts, back the bolts out of the shifter frame until only a few threads remain. Push the stick firmly into third gear and hold. Screw in the stop bolt until contact is made. Release the stick and back the stop bolt out one turn and tighten the jamnut. Push the stick into fourth gear and repeat the procedure.

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i did that .
it is with the 3° and 4° gear and not 1° and 2 ° from Hurst notice.

I did that, though i will unbolt on more turn as i don't engage fully.

My rod are nicly adjusted . I took great care doing this while the trans was removed.

I don't see HOW we can overshift a gear .

Thanks anyway.