The importance of measuring bell housing runout.

cli55er said
Didn’t read this whole thread yet… but wanted to reply specific to your mentioning the automatics and front seal leakage and flexplate cracks.

B&M flexplates are supplied with instructions for checking runout

This confuses me. How do you check runout with an automatic transmission?

cli55er said
But I can say… the autos def need to be checked after all these years id say. 53 year old trans case could be bad.

I look forward to reading the rest of the thread. :)

Need to be checked? I do agree, especially after a collision. I'm just curious about how it would be done. If there was some way to measure the runout without complete transmission disassembly, I'd sure like to know.

As for the rest of this story, the original thread for the Tremec install in Rich's Coronet is here:

Tremec TKX 5-Speed Conversion

I also did a Tremec swap back almost 3 years ago. I wrote about it here:

Tremec 5 speed conversion in a 1970 Charger