Manual Transmission oil

24525 Views 34 Replies 12 Participants Last post by hitek14, Oct 28, 2015

jaylorenzo

Discussion Starter · Oct 27, 2015

Hi I have a 1965 mustang with an original Ford 4 speed. I want to change the transmission oil, but I don't know which oil I should use.
Also, I daily drive it pretty much every day, not really in the winters but I will need an oil that can operate at lower temperatures (Nothing crazy, like I use 10w-30 and it works fine. I live in SLC, UT if anyone is familiar) But I have noticed that when I change gears in the morning (fairly cold), it shifts hard. But then warms up and functions better. So i know that is normal, but i am debating about switching to a lower viscosity. Anyways, I would love to hear any input! THANKS!!

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Hemikiller

· #19 · Oct 27, 2015

As has been said, Ford specs out GL-4 for the toploader and it is better suited to the blocking rings than the current GL-5 lube. GL-5 will not make the tranny "blow up", but if it's available, get the GL-4.

I bought mine from amazon when I was ordering some other stuff. IIRC, it was only $22 at the time.

http://www.amazon.com/gp/product/B000M8RYMC?psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s00

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