I thought I should change the fluid while I have the shifter out but what should I replace it with. I know ATF is what it calls for but should I go synthetic....what brand do you guy's reccomend. Should I take the fill plug out or just put 2.6 litres in.
I run D4 personally. If you drive the car in a cold climate (cold morning starts), the synthetic might be nice. I use it for 110*F ambient temps in the summer (opposite extreme).
You are not going to go too far wrong, so dont sweat it too much.
I guess the difference between the 2 is temp. Basically viscosity. Just like in motor oil's. Redline has always had a good name but regular old atf has worked for me.
Go to the parts store and get some Dex3/Mercon (Mercron?) The store brand ATF will be blended for both GM applications and Ford Applications. Just don't get the stuff for Chrysler vehicles, which is ATF+4 IIRC. Either synthetic or regular. That is pretty much all there is to it.
Personally, I run the regular stuff because I change it often.
I had always used regualar tranny fluid until this last change when I put Royal Purple in. I had never had any tranny grinding problems until after the RP was in...but it was after a hard trip at the track. I never had the problem before with hard shifts...
I doubt it matters much...and the Redline D4 is good stuff from what I understand.