I've decided to switch my tranny fluid to GM synchromesh FM. I did the "search" and found the part number to be 10-4014 "8890399". I called a Cadillac dealer and they told me that their GM Synchromesh FM has a different part number of "12377916".

Would this be okay to put into my S2K? Also, this may be a dumb question but how many bottles do I need?

Thank you.

 

88900399 : Synchromesh Manual Transmission Fluid (Friction Modified)

GM: Synchromesh Friction Modified - #12377916

AC Delco: Synchromesh Friction Modified - #10-4014

they're all the same thing. get 2 qts.

 

Thank you Vodalus.

 

Thank you Vodalus!

 

for your library:
http://www.acdelco.com/html/pi_vehcare_lub.htm

Part 10-4005
88900332 General use MTF

Part 10-4014
88900399 Syncromesh FM (for NV1500 trannies)
Semi-syntheti


Interesting, that one of the best tranny fluids for our little cars was designed for a truck.