Mismatched Speedo and Trans

Is there a way to use a Ford speedometer cable and speedometer (1977) to hook up to a Chevy TH400 transmission?
Is there a conversion gear?

If so can someone pont me in the right direction to purchase?

 

On the older Fords ... it bolts right up. I had a 56 F-100 Big Window and installed a BBC and a Turbo 400 ...

I did have to change the speedometer drive gears in the tal case to get it calibrated correctly ... but that's NOT a big deal either



This photo shows a 700R4 but the gears function the same way in a Turbo 400

 

Use a cable from a GM [Chevy P/U late 60s works well] The speedo head connection is the same size.

 

Yep or a universal cable with the correct ends.

This site has a wealth of information on Speedometer drives and cables.
http://www.transmissioncenter.net/speedometer_calibration_______va.htm

A lot of us here have it bookmarked for reference and almost everything they show should be avaialble locally but you can order from them too.

The simplest way to calibrate a speedometer now days is to use a gps to check the speedometer and then figure out what percentage it is off and go from there.

 

If you can find a decent parts guy with a book, they can match it.

 

Thanks for all the info.

 

This is the end of my speedo cable.....




..... and the interface with the trans.


But I am being told I have to buy a new TH400 cable, which is okay, but I was sure hoping all I had to do was mod the end of the cable and plug it into the trans.

Dang it.