Doug nash 4+1 fluid

I am trying to figure out what lube to put in the Doug Nash 4+1, 5 speed,do any any of you guys know.I can't find much for info on this.Oh I forgot to mention and don't know if it makes a differance that it is face plated ****** not a pro shifted

 

normal 75/90 should be ok its what i use

 

Cool , thanks for the help

 

Doug Nash used to recommend adding a small bottle of the GM Positraction additive to the gear oil but I don't think Richmond recommends anymore after they acquired Doug Nash.

 

I run 75/90 in my 6 speed per Richmond,no problems.

 

Are you guys using synthetic ar dino lube? And whats a brand to use in it? Thanks for the help.

 

Richmond told me not to use Synthetic, I have about 3000 miles on the trans now and it shifts great, worth every penny, and that was alot of pennys !

 

Thanks Speedy thats what I needed.