I have a 70 727 that has a modified auto valve body. It has the TF2 kit, and much heavier shift springs than stock to delay, and to even out the WOT rpms at the shift points to get them closer to the same rpm.

At the lightest acceleration from a stop, the 1-2 shift is quiet (no problem), but the 2-3 shift has a loud THUNK noise. Under medium to heavy accel, the 2-3 shift is quiet.

Is there anything that I can do to soften the low speed 2-3 shift noise?
Do I need to look at an aftermarket valve body to clean this up?

I am driving the car a lot more and I just want to get away from the hard 2-3 noise during in town driving.

Thanks
Dave