Synthetic Gear Oil

[milesoftexas]

OK to use Amsoil Severe Gear 75-140 for transmission & rear differential in a 39 Deluxe?

 

[jake197000]

i dont see why not

 

[Kahuna]

I use 75-90 in both the trans and diff in my 39 coupe and my 32. Seems fine to me

 

[Obsolete Jim]

Absolutely okay. Without getting into all the technical details, your gears will love you for it.