OR should i buy brand new ones and fill those? im not really planning to drive the car hard anymore so wheel hop isnt the issue. i just want to get rid of the engine flop. The car jerks when getting on and off the throttle mainly in 2nd and sometimes in third gear. thanks.

 

It depends on how bad the cracks are and where they're located. Are they in a place where the polyurethane is going to mean that part is no longer truly stressed? Will the poly completely fill it. I sent some to a .org member with a tiny tear on the driver's or passenger's side mount. It was in a place that wouldn't be bearing load with the poly in place so it's not a concern. Consider how deep the crack is too. This was very short and very shallow.