Transmission upgrade 66' 4 spd to 5 spd

[RoRod]

I am looking to change transmission from 4 speed to 5 speed. I have a 1966, 1600 - not sure what could bolt up without to much alterations. Any knowledge welcomed.

[theunz]

Most here use the 5 speed from a 2000. The shifter location is just slightly different and I believe you will need either another 1600 trans to bell housing plate or the thicker 2000 plate along with the 2000 drive shaft. Many have been done this way.

[notoptoy]

As noted above, you need: a 2000 5-speed two-piece Drive shaft, the 5-speed, Either two of the 1600, or one 2000 Trans housing plate, and a 5 speed transmission cross member. You'll have to elongate the shifter hole so you will need a metal cutting saw, and you will need a BFH to make a few strategic adjustments to the transmission tunnel. It can be done with some effort on a 66, swapping on a 67.5 or higher is pretty straight forward. There are several threads here that are step by step on how to get it done.