speedbiu wrote:The shifter hole for the Muncie is not centered in the floor
That's normal.
The shifter hole won't be centered because the shifter doesn't go into the top of the trans like it does on modern units.
The shifter mounts to the driver's side of the tailhousing on Saginaw, Borg-Warner and Muncie 3 and 4-speed transmissions.
I don't know what GM would have supplied for a shifter on that car, or if it has been changed over the years.
I'd bet that it would be an Inland Tool and Machine (ITM) or Hurst shifter.
If it's a Hurst, it should be a Competition Plus. If it's a stock, GM supplied Competition Plus, there will not be any stop bolts in the shifter body to prevent overshifting. If it's an aftermarket unit, it will have stop bolts.
Also, the stock GM Hurst units will have a round shaft with a flat spot in it with the Hurst name cast in. If it's an aftermarket unit, it will have a flat shifter shaft.
If it's an ITM, it will have a plain round shaft and ITM will be stamped in the shifter body side plate.
Shawn

