I have a 67 convertible, 327 (300hp), M-20 tranny, 3:07 rearend.

The car is bogging and shaking off the line. I understand that m-20 with 3:07 equals a car that is slow off the line. It has always been that way and since it is a conv and I never meant for it to be used for racing around I accepted it. Lately it is worse though and I am wondering if it is the clutch or the frame needs stiffining with sub frame connectors. Any advice on how to diagnos what is the issue? I have the stock X-brace on still.

The suspension is stock and was restored 5 years ago. I recently upgraded to OEM style power disc brakes (front only). That is all that has been done recently. The front end vibrates now when braking and under 15 mph. I think that I need to check the front bearings and possibly tighten. Maybe they have seated since I did the brake instal and new spindles. Does that sound correct after a brake/spindle upgrade?

Thanks,
David

Bogging sounds like fuel issues. The shaking sounds like clutch. Mine shook bad until I changed rearend gears 90% disappeared. Changed clutch and remainder disappeared.
Never heard of bearings seated after install. Are the ball joints good? maybe bad tire.

Thanks!

The engine runs strong and really pulls in the mid and top end. I am not sure what fuel issue could be causing bogging it but maybe I will change the fuel filter to be sure.

What did you change your rearend gears from and to? Are you paring them with a m-20 tranny?

The front end is solid and tight. I checked all components when I did the brake job. It only vibrates when braking and usually only when under 15mph.

If it shakes under braking, you need to pull the wheels and take a look. First spin the rotors and eyeball for runout (wobble) If they wobble pull them off and have them turned. Then make sure the bearings and spindle are ok, regrease, put it back together, will be ok.

I agree with Jim. Check the wheels again. Bent rim maybe
I went from 2.73's to 3.73's with a M-21
What about the accelarator pump in carb, though that would be more hesitation than bogging Imho

3.08's + mild motor + M21 = A lot of shaking off the line unless you "slip" the clutch or really tach up the motor.

I had 2.73 and M20, it was not fun to drive. A pain to get off the line and I could often smell the clutch dying. The feeling is similiar to trying to start out of 2nd or 3rd gear in a normal/modern car.

Changed my gears to 3.55 and it works great now.

As others stated, time to check front brakes for other shaking issues...

Solved shaking issue when braking. Loose tie rod sleeve on the drivers side.

Thanks for feedback on rearend gear ratio.

David