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Old 08-20-2018, 11:50 PM
Join Date: Jan 2018
Posts: 53
W108 Gearbox Fluid

Hi, I am going to change the gearbox fluid on my 1969 280S with a 4 speed manual gearbox for the first time. It has the later side cover G76/27 box.

Question: Am I reading this right that I put ATF in it? It’s a new one on me! Thanks all!
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W108 Gearbox Fluid-a95a3759-4af0-426a-8ed7-551d607c416d.jpeg  
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Old 08-21-2018, 08:08 AM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 4,501
Yup, ATF type "F", for early model Fords ('60's and '70's).
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Old 08-21-2018, 09:53 AM
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Join Date: Jan 2012
Posts: 7,179
I'd read that as Dexron since Type F is generally specified as such.

Type F has a higher friction coefficient than Dexron so it works with the metallic clutch plates in a Ford auto trans.

In a manual trans, the synchronizers are generally cone shaped clutches that bring each gear to the same speed as the shaft. On a trans that is worn, too slippery of a fluid can cause the syncro to slip and gears to grind. Moving to type F might help this type of situation.

Thicker oil can help a worn trans by causing more drag. ATF is about a 5 weight so moving to a motor oil can help, some brands of cars did spec motor oil so this isn't something new.
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Old 08-21-2018, 11:17 AM
Join Date: Jan 2018
Posts: 53
Thanks, the previous owner just wrote the word Castrol in his records. The gearbox has 270k miles total, about 66k since it was rebuilt.

Last edited by Rook; 08-21-2018 at 11:58 AM.
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