1950 Plymouth Three Window Coupe - Ramrodder: Part III - Tech

A test-fit of the spacer proved that it fit tightly on the transmission flange and all the bolt holes are aligned.

We checked the fit of the spacer and flexplate on the converter snout as well. Note the ring gear is offset on the flexplate toward the engine.

To make sure the attaching hardware didn't bottom out in the holes, and to make transmission installation easier, studs were used in the mounting holes. Note the ring gear is flush with the flexplate on the transmission side.

The crankshaft flange was tapped for use with bolts. We ordered ARP flexplate bolts from Summit.

As we plan on running RamRodder down the quarter-mile we wanted a bullet-proof transmission. Gearstar obliged by building a Stage V 4L85E. Along with all the other trick parts this one is equipped with a trans brake.

For the ultimate in flexibility we chose a 10-inch converter for increased stall speed (for a hard launch) and lockup for cruising the open road.

The torque converter is secured to the flexplate with three metric cap screws. Thread locking compound should be used when they're installed.

Use care when attaching the engine to the transmission, they should come together easily and fit tightly with a small amount of clearance between the flexplate and converter. Never use the fasteners to pull them together.

With the engine and transmission assembled they were slid into place for a test-fit. A heavy combination, this is a testament to the strength of our engine hoist and straps.

Chassis Engineering brackets were bolted to the block, and they use early Ford-style rubber cushions. Templates for the frame brackets were made from cardboard.

Frame brackets were cut from 1/4-inch steel plate, the large hole locates the cup that holds the upper cushion.

A large rosebud tip was used to heat the plate so the edges could be bent 90 degrees.

The completed frame brackets viewed from the bottom (left) and the top (right). They were made wider than necessary so they would also serve to reinforce the area where the frame and stub were joined.

For additional support, two small gussets were added to the underside of the frame brackets.

A stock GM mount was used at the rear of the transmission, a tab to attach it to the tube crossmember was made from a formed piece of flat stock.

The mounting tab was notched to fit the 1 3/4-inch round tubing that would become the transmission mount.

To attach the new transmission crossmember to the frame a pair of 4-inch square plates, 1/4-inch thick, were made to attach to the frame. Then 3/16-inch plates would be welded to the crossmember so it can be bolted in place.

After a test-fit the 1/4-inch plates were welded to the framerails

Here the 3/16-inch plates were bolted to the frame brackets, the tubing crossmember will register in the large hole.

With the endplates welded to the crossmember it was bolted in place. Simple, but it works.