As per the transmission oil, the recommendation is to use a GL-4 oil, usually a
90 weight or close variation. GL-4 is for non-hypoid gears and does not have the
sulfur additive of the GL-5. Definitely do NOT use GL-5 or Extreme Pressure,
Hypoid gear lube as it will slowly corrode the synchro rings.
-- 
Vic Whitmore
76 Spitfire
Thornhill, Ontario
http://www.vicwhit.com
Howard Baugues wrote:
> 
> OK, I could use some advise and instruction from the list. Today I
> purchased a used overdrive from a 77 Spit and want to install it in my
> 76 that has never had OD.
> 
> Could someone that has experience with this guide me through what all
> needs done to complete it? Do I need to pull the engine in order to
> change the transmission. I know I should do some servicing and cleaning
> before installing it. What oil should be put in the unit? GL90, 20-50?
> 
> Thanks in advance,
> Howard Baugues
> 76 Spit
> 77 Spit
> 68 GT6+
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