Lubrication question - 235ci, T-5 & 12 bolt???

Hi all,

I need some advice on what oil types and grades to run in my rebuilt driveline please.

1955 Chevy 235ci straight 6 - I've been told to go for 20W-50. Is that ok?

1985 Brog Warner T5 NWC - what do I use? Is it true that I should add some regular SAE 30 in there along with the trans fluid?

GM 12 bolt axle - no lsd. - What grade?

All advice grategully recieved.

Many thanks,
Mark.

 

trans use syncromesh trans fluid or auto trans fluid
12 bolt diff gear lube

 

SAE 30, no detergent oil in a 235 unless it's converted to a full flow oil filter. You don't want it loosening up crap in there because there's no place for it to go, and even if it has a factory filter it's a bypass filter and does not filter all of the oil.

 

Should have said........235 is converted to full flow oil filter.