Well it appears we're not going to Bonneville. The transmission in the Studebaker won't stay in gear. It has done this with 2 Muncie transmissions, 2 driveshafts, 2 differentials, 2 clutches, a new pilot bearing. I dialed in the scattershield to nearly zero. I also had the flywheel and pressure plate balanced as an assembly. It has a new old stock Hurst shifter that I have adjusted 10 times. It will pop out of 1st gear under acceleration at about 6600 rpm. We ran it up in 2nd, then after shifting to 3rd it popped out. It did this with a used Muncie, so I had the Muncie re-built. It still popped out. Over the winter I purchased a new Autogear Muncie knock off. We ran the car on a chassis dyno prior to the May El Mirage, and it popped out of 1st gear. The car shifts fine when it's on jack stands, or when the dyno isn't loaded. As soon as there is torque (effort) introduced the trans popps out of gear. The Studebaker is mounted on a Chevy S-10 chassis, that has been partially boxed, and is full of crossmembers. The engine has solid front motor mounts, and now has rubber in the rear based on the transmission manufactures suggestion. I should also say the rear end pretty much sits on the rubber snubbers. It has been that way for several years. It also has a pinion snubber, and the pinion angle is only a couple of degrees. This has been such a good car. After Bonneville last year my son drove the car at El Mirage in September and went 181. In October this started happening. I did a frame off disassembly of the car last winter, and inspected every inch of the frame. I cleaned everything up, used all grade 8 hardware, and re-assembled. My efforts didn't cure the problem... Any ideas would be welcome. Again this could be torque induced.