The new Gear Vendors overdrive (yep, traded in the old one) uses the larger TH400 pinion shaft. That's good. But it no longer has the extra mounting boss I was using to hold the drive shaft safety loop. Here's the solution to not adding holes in the car. Just flip it 180° and bolt it to the seat belt mount. It's a lot stronger than using small bolts and washers.
Well, time to go racing, sorta. Next race isn't for two weeks, the first weekend of June.