[s-cars] urS4 trans additive?

[John Cody Forbes]

Brett Dikeman wrote:
> Almost....any GL4 compatible synthetic gear oil.  Some GL5 gear oils
> had an additive that was not compatible with brass syncros and they
> would be destroyed in short order.  I think most manufacturers have
> stopped using said additive, but I don't know for sure, and god knows
> what's sitting on the shelf at Shady Supply.

I was going to use GL5 compatible Mobil 1 75w90, any input there? Thats also 
what I put in the rear diff since we didn't have an straight 90 weight.

-Cody Forbes
http://www.5000tq.com
'86 5k noT noQ
'86 5k noT noQ - Parting Out
'87 5ktq
'87 5ktq - Fast. Really Fast.