What's needed to install a Doug Nash 5spd behind a 13b with a rx-4 bellhousing? I need to go about this in the most economical way.

Thanks, in advance.

 

Adapter plate from G-Force transmissions.
Machine the input shaft in the area for the pilot bearing to the same size as the factory Mazda tranny.
You'll also need a new clutch with the same input spline count as the Doug Nash.
New driveshaft and tranny mount also.

 

whats a doug nash 5 spd tranny?

 

It's the same tranny as the Richmond 4+1, 5-speed. Doug Nash was the original designer and manufacturer of the tranny. Even the present G-force 5-speeds are based on the design.

 

The Doug Nash 5sp / Richmond 4+1 is an excellent transmission. It can handle quite a bit of abuse. The case splits in half making maintenance and gear changes a breeze. There is a wide variety of gear ratios available. I owned the 10th one built. The majority of the internal piece lasted though 3 cars and 5 engines. The transmission went way beyond my expectations during that time period.

 

how much do they run costwise?