If you have, or are thinking of a 700R4 conversion...look here

[Longhorn Man]

Reading an article in Car Craft, and they have some info on the little adapter thingy to make your speedo work!
They said there is one available for the 4l60E, which is the newer 700R4. If they made one for this one, they'll probably have one for the older version, if it isn' the same P/N.
STREET AND PERFORMANCE
(501)394-6568 www.hotrodlane.cc is the web addy, but it came up blank on my screen.
Check them out might be the answer to your speedo problems.

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'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio