[slvrchvllss]

Want to change out the transmission fluid on my 70 SS with an M20 4- speed. I figure I have to pump it out by hand since there is no drain plug. What weight gear oil do I run?? Also, do I use GL-4 or GL-5?? How much do I need as well?? Thanks in advance. :hurray:

 

[MEJ1990TM]

I run Valvoline 80W90 in the ST-10. I am pretty sure that is what was run in the M22 as well. I can't help with an exact ammount, I just fill it up to where it's level with the fill plug.

 

[anychevy]

What weight gear oil do I run?? Also, do I use GL-4 or GL-5?? How much do I need as well?? Thanks in advance.

GL4 Read this
http://www.chevelles.com/forums/showthread.php?t=301189&highlight=muncie+gl4