[TR] J-Type Overdrive oddity

[Randall]

> The J has a relief valve which is "sensing" this condition and not 
> engaging until the pressure drops. 

Doesn't work that way.  The "relief" valve regulates the pressure by relieving any excess back to the sump.  It is normally slightly
open all the time and only varies how much to keep the desired pressure; either around 20 psi when idle or 550 psi when operating.

> You may have used 80-90 
> gear oil in 
> the gear box as well, exacerbating the problem .

Just to be clear about this, 90 weight GL5 gear oil is the factory-recommended fill for temperatures above -10C.  For temperatures
below +10C they allow 80W GL5 gear oil.  So 80W90 should be perfect in all temperatures (since the 80W rating is for 0C and the 90
part is for 100C).

> I'd drain  both units  
> and replace with 30wt non detergent

Which would actually be thicker at the same temperature than 80W gear oil; plus not have the additives to protect the gear faces.

Randall