Yup Gates RPM, that's it.
Do you remember if your converter was shimmed already? Its easy to check the gap using a 1/8" drill bit placed between the flexplate and converter mount lugs. But too far into the trans you risk cracking the pump, too far out and you risk stripping the teeth off the pump gear.
When I was doing my research on the 31.5" spring conversion, I was told to only get the rubber isolators for the top of the spring that contacts the frame perch, that the bottom of the spring on the axle didn't matter. I just didn't like the fact of the metal on metal of the spring and axle perch, that's why I went with isolators on top and bottom.
Do you remember if your converter was shimmed already? Its easy to check the gap using a 1/8" drill bit placed between the flexplate and converter mount lugs. But too far into the trans you risk cracking the pump, too far out and you risk stripping the teeth off the pump gear.
When I was doing my research on the 31.5" spring conversion, I was told to only get the rubber isolators for the top of the spring that contacts the frame perch, that the bottom of the spring on the axle didn't matter. I just didn't like the fact of the metal on metal of the spring and axle perch, that's why I went with isolators on top and bottom.