It's been my lot in life to only experience the most oddball of the oddball problems when it comes to building hot rods. I have a '40 Ford pickup on an '86 Ranger chassis and thankfully I have it almost completely sorted. One problem that had been dogging me from the start was lack of OD in the 700R4. I held off on tackling that till I got the engine running correctly so that the truck was completely driveable. Last week I took it to a local trans shop well known to the hot rodders in the area and he had it fixed in short order. Turns out there was a stuck valve in the valve body that had been fouled since the transmission was rebuilt. While it was at the trans shop, I asked about a couple other observations I had namely; the shift points were lower than I liked and the truck always seems to lurch when you're taking off. The lurch was so bad that I actually changed the pedal ratio on the accelerator cable so that it is possible to feather the gas with a little more finesse in order to get it off the line smoothly. The trans guy said that he didn't the shift points were that awfully low and I had to agree with him to some extent since I was forever nursing the truck off the line to avoid the lurching, therefore letting the truck shift early. I asked if he thought the lurching was a torque converter problem but he told me that the transmission and torque converter were working correctly. Indeed, the truck now shifts and goes into OD and the converter locks up correctly. He felt that the lurching was some sort of mount or other driveline component torquing up when it was accelerated any harder than a minimal takeoff. In order to arrive at the correct wheelbase with the Ranger frame, I turned the leaf springs around 180 degrees and installed them with the longer portion of the spring toward the front of the truck. Although I can't see under the truck and drive it at the same time I'm wondering if I'm winding the springs up when I hit the gas? Has anyone experienced a situation like this? FWIW I'm using after market engine and transmission mounts for the Chevy 4.3. The rear trans mount is adapted to the Ford crossmember with a stout but home made plate. The Ford crossmember is attached to the vehicle frame through large rubber bushings and that crossmember was originally intended for a Ranger with a manual box. I'm wondering if I have created a can of worms here. I checked out another Ranger with an automatic and the crossmember is hard bolted to the frame. I'm wondering if I have too much rubber between the tranny and the frame? I'd love to straighten this out since the rest of the truck has really come out nicely.