6-speed with 3.6 rear end but that doesn't matter. The senders in the transmission are obviously different, but the speedo always expects 4800 pulses per mile.

that's what I am trying to understand, the sensor in the transmission has to be matched to the differential ratio to produce the 4800 ppm. a different ratio needs a different sensor

yes, that's correct. The sender must be choosen so that it produces 4800ppm for the rearend you have.

https://lh4.googleusercontent.com/-I...o_sensors2.jpg

I need one for the 3.636; do you have a part number, or one for sale?
+1 for you

I posted a pic above, but somehow it doesn't show.
https://picasaweb.google.com/lh/phot...eat=directlink
Sorry, don't have partnumbers.

Necro thread update to add that it's 4000ppm, not 4800ppm :)