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#1
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Manual transmission fluid advice
What is the best oil to put in a newly rebuilt Muncie 4 speed?
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#2
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Gear oil. 80w-90.
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Two 1975 455 Grandvilles & '79 455 Trans Am ‘69 Camaro SS 396/375 (owned since ‘88) ‘22 Toyota Sequoia V8 ‘23 Lexus LS500 awd ‘95 Ford F-super duty 4wd 7.3 p-stroke & countless Jeeps & off road vehicles. |
#3
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Sta-Lube SL24229 API/GL-4 Multi-Purpose Gear Oil, 32 Fl Oz https://smile.amazon.com/dp/B000KKHO...4EJSQBRA1X0YWJ
This is what I’ve always used. Can be found at most NAPA stores. It is GL4 rated. Suppose to be better for transmission’s with brass syncos although a lot of guys swear by GL5 lube. Murf |
#4
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Quote:
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Jeff |
#5
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Quote:
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#6
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FWIW, decades ago I believe it was Hot Rod magazine that suggested adding 10% STP on a 4 speed rebuild. I tried the suggestion after rebuilding a T-10 and a few Muncie's, all the transmissions shifted like a knife through soft butter with the STP added. I would do it again today if I was wanting a smooth shifting manual transmission.
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#7
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Sta-Lube SL24229 API/GL-4
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