Add to Cart Compare Quick view BR 6 Bolt 4G63 / Auto. GM Transmission Adapter Plate MSRP: Now: $850.00 Was: Buschur Racing is now offering a complete bolt in adapter kit to install a GM automatic (TH350, TH400 and Powerglide) into your rear wheel drive project. The kit comes complete with the aluminum adapter plate, flywheel adapter and ARP fasteners, starter... MSRP: Now: $850.00 Was: Add to Cart Compare Quick view