Transmission swap

[jlw35]

My '75 Spider's tranny has some leaks, and some metal in the pan.
I happen to have a tranny from a '80 Spider 2000.
Both are manual.
Can I do a direct swap, or are modifications necessary?

Thanks
Jeff

Also, looking for a machine shop in the St. Louis, MO area to rework the head (someone familiar with the Spider), any leads?

[So Cal Mark]

swap away

[jlw35]

Ha, thanks for the quick reply Mark, and the good news.

Jeff

[FiatMac]

Your only issue will be that the speedometer will register slower than you are really going by about 10% unless you disassemble the '80 transmission and install new speedometer drive gear. The '75 transmission speedometer drive gear was set up for a 4.3 rear end ratio and the '80 was set up for a 3.9 ratio.

[jlw35]

Good point Fiatmac.
Thanks
Jeff

[bradartigue]

...and given that your speedometer came with an inaccuracy rating of about 10% to begin with, well, you'll be fine. Who really uses these things anyway?

[vandor]

Clarification: the speedometer drive gear in the transmission and the speedo drive that is bolted to the transmission is a matched pair. If one installs either one that has a different number of teeth from the original, they will grind themselves to pieces. They must be replaced as a matching pair (as far as number of teeth go - they do not have to come from the same car).