[Land-speed] Synthetic Motor oil

[Rick Byrnes]

I'm in agreement with Brian that  rears should use only hyphoid lubes.
Transmission on the other hand depend on what lube they were designed for. 
T5 was designed for ATF as a lube as was the TREMAC.
I found the T5 shifted better with Mobil 1 30 wt engine oil, I didn't 
experiment with the TREMAC.  With the liner, I use a Jerico 4 speed.  Since 
it started out design of a Ford top loader, I haven't used anything but 
75-90 Mobil 1 Hyphoid lube.  I'm not sure I'll go lighter than this for some 
time in the trans or rear.