im having an issue where something is causing my alt belt is flipping over on the pullies and is shredding apart. iv gone through 3 belts in 2 weeks and i have no clue where to start. somebody who has had this issue b4 please help. also im starting to think it might be my harmonic balancer cause it wobbles slightly till the engine is revving up past 2500 rpm's HELP!!!

If it wobbles then it may be bent. Have you recently removed the crank pulley or done any work relating to removing or retensioning the belt?

i havent done anything except replacethe ps/ac belt and the alt belt. ive noticed it wobble before but always thought it was supposed to do that since it was the harmonic balancer. i thought it was just balancing out. these 420A motors are new to me so im at a loss withit. i still cantfigure out why the belt flips over. it never leaves the pullies but just flips over to the smooth side

it's not a balancer, it's just a dampner. It also has a rubber ring in it, which may be decayed and coming apart.

Replace the crank pulley.

Originally posted by DarkOne
it's not a balancer, it's just a dampner. It also has a rubber ring in it, which may be decayed and coming apart. Replace the crank pulley.

This.

I bought an underdrive for my rebuild because I didn't want to pay for new and all 3 of the used ones I have are junk

what dino said