for three weeks now, i've been worrying about my Cadillac Seville driveshaft because the rotation has gone abnormal and i think it doesn't extend and amplify the torque. What's the best adjustment you could give, or any suggestion will do? Thanks!

 

One suggestion: What year Seville, 1957 or newer? If later than 1979 it doesnt have a drive shaft. It has axle shafts (2) What do you mean "extend" ? I make some noise when I have a problem extending!! but I'm 60!! Add year and type of Cad to your profile signature please.

 

It's a '67 Seville. It's my grandpa's.

 

67 Seville?, All 67s other than Eldorado are rear wheel drive. Driveshaft can be removed and checked at driveshaft shop. There could be problem with cv joint on driveshaft.