Author Topic: Gear Oil Weight suggestion needed for 4spd gear box using original trans seal  (Read 212 times)

Offline Sean C. Gearty

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  • 1969 San Jose GT
Anyone own or restore thoroughbred level cars that are not driven, but show cars only?
    -a car that is only driven on and off a trailer for short distances

If so, there is an original seal in the back of my trans that is weeping 80Wx90 oil on me.

My question is, has anyone used a higher weight gear oil to help prevent any small leaks without damaging the trans?
   -my Mustang is a 1969 with an RUG-AE2 Trans

Thank you for your help and suggestions
Seann
« Last Edit: July 16, 2017, 07:55:11 PM by Sean C. Gearty »

Offline rockhouse66

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Sean

I am certainly no thoroughbred expert, but I would suggest running only 1 qt of oil or so in the trans.  This will still be enough for the gears to pick up and sling around but should be below the output shaft seal.

I would not recommend this for a 50 mile journey, but a 1/2 mile trip would be fine IMO.
Jim
'66 GT FB, '69 CJ Grande

Offline Sean C. Gearty

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  • 1969 San Jose GT
Hey Jim,
good idea for now. Thanks!

I will reduce to one quart, and await any other direction from the forum.