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feeffie
    
What is the correct "gear oil" for a 1967 Plymouth 3 speed manual transmission.
I am a Ford guy and working out of my realm of knowledge and need help. The car is a '67 Belvedere that originally came with a 318 and a "3 on the tree". I have installed the original rebuilt 3 speed manual back in the car and want to put the correct oil in the trans the first time.I don't have access to the original manuals and have heard that everything from ATF to 90-140w gear oil is correct. I would typically use a 90 weight gear oil (in an older Ford) but have found several postings where ATF is said to be the correct oil for this trans. Any documentable information would be appreciated.
Thanks in advance.

FEeffie
posted: July 20, 2016
 
     
 
  Answers (1)
 
srfn872
    
ATF is used in many newer manual transmissions. 90w was the normal gear oil back in the day. In reality ANY oil will work. ATF has a higher heat range, but isn't under pressure in a manual transmission and seems to promote quicker wear. 90/140 is probably what is available now, but can be/get a little too thick in colder climate environment. I've used 40w or 50w for years and had NO problems with my manual transmissions on the west coast. Hope this helps
posted:  July 21, 2016
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