10-08-2013, 09:54 PM
RustyI use Dexron III in my 4L80E; when I had the tranny uprated, the shop said synthetic was unnecessary unless the temp ran high. It runs at around 145°F and hits around 200° on very long grades. Normal base stocks can handle those indefinitely.
I do have a Mag-Hytec pan that increases capacity by ~4 qts., and is engineered to provide additional cooling. This is probably unnecessary with the ability to add external cooling with the TH400; however, the non-lockup TC generates more heat...
I consider a temp gage essential.
Rusty
"StaRV II"'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP
Nelson and Chester, not-spoiled Golden Retrievers
Sometimes I think we're alone in the universe, and sometimes I think we're not.
In either case the idea is quite staggering. - Arthur C. Clarke
It was a woman who drove me to drink, and I've been searching thirty years to find her and thank her - W. C. Fields