Reply to "ZF Trans"

The ZF is arguably the strongest part of your car. Jr Wilson swapped a bored 'n stroked Boss 429 (538 cubic inches) into his race Pantera, The ZF handled the estimated 900 horses & 600 ft-lbs torque just fine. Your grinding most probably indicates the synchros are badly worn. ZFs use steel synchros which wear slowly, but as they wear, they also wear down the mating gear-cone. So, one cannot just replace the synchro ring to fix this; the entire gearset plus the synchro must be replaced. This is why I've been preaching about using long-throw clutch slave cylinders to lessen the drag on the synchros while shifting. To diagnose this correctly, you'll need to pull the ZF and send it to the only FACTORY reconditioning shop on the planet, RBT Transmission, in So-Cal. Lloyd will disassemble the box & check it over. Website is WWW.rbttrans.com. He is also the only one who has new parts available. In the meantime, you should start negotiating a 2nd mortgage....