[cheese country GP]

Check your brake shoe adjustment. I had the same thing on my '62 GP & it turned out to be the brakes were adjusted too tight. Usually spin the wheels till they drag slightly & then back off a couple clicks. If you have 8 lugs, back off 10-12 clicks & that should do it. I know, seems like a lot but it did the trick for me. The pedal still only goes down about half way so plenty of brake left . I did the wheel straightening thing, rebalanced all the wheels, & then had the driveshaft checked for proper balance. Everything was just fine. Did the brake adjustment the way I've described above & the problem was solved. 65+ & smooth ride. Good luck