Kentetsu

Since my latest round of fluid changes, my stance on this subject now stands as this:

For trannys with grinding synchros, 50/50 mix with gear lube/ATF

For those without shifting issues, Lucas Gear Oil

I'm running straight Lucas now that I no longer have the grinding issue, and performance seems to be holding. So far, no issues and great shifting.

Crispin38

iTrader: (3)

Anyone ever tried D4 ATF from redline?
Even after trying the expensive Idemitsu, I'm debating on going to straight ATF and if you look up the D4 it looks to be what everyone should be running. It looks to be 'the answer'.

MA2LA

I have been running royal purple and 98% of the time its great and then every once in a while it just doesn't want to shift. the last time we put fluid in the tranny it was on the lift at Rp performance and I think they use Motul and what ever it was it didnt hold up well, after 2 days of scca school it was shifting like crap with the 2/3 shift and the 3/2 shift to the point i started just using 3 and 4 to make sure i made it thru the 3rd day of school.

Crispin38

iTrader: (3)

I think I'm going to stick with the Idemistsu for a while.
I'm happy after driving this morning.

DriveFast7

iTrader: (1)

I've been using Sta-Lube GL-4 85w90 for the last few months in a rebuilt tranny. Once the fluid warms up it shifts good, nothing great but shifts are smooth and confident. Haven't grinded any gears. When fluid is cold, shifts are slower and notchy. Drove around for a few hours in the hills and it worked just fine. As the fluid got hot the shifts were real nice and quick.

Not a bad fluid for the buck and it's brass synchro friendly. $32 a gallon. You can buy it at NAPA, Amazon.com and ACE Hardware too.

http://www.crcindustries.com/auto/co...S=Y&PN=SL24239

broncoblitz

I've been using Red Line MT-90 for about 2k miles (switched to it after breaking in the rebuilt transmission) it's been working well for me. A little notchy when cold but warms and becomes nice and smooth. It also responds well to quicker shifting.

Hyper4mance2k

iTrader: (40)

I'm telling you guys a lot of raceteams use Redline for a reason. It's amazing. If you want the great stuff run blue shockproof, it's still only $12 a quart. $25 is not that much money for piece of mind.

bmeyer

iTrader: (5)

I'm using Valvoline in the tranny and it feels very good in my car. I can't speak for any of the others, but good ol' Valvoline feels just great for me.

MadRotors

I know that this is an old thread but I was hoping some of you might still be on here I'm doing some research I track my RX7 FD and him choosing new transmission and differential fluids I'm currently using Red Line and I like it just fine but sometimes at the top of 3rd gear I have a hard time getting in the 4th just wondering if any of you or running any of these Solutions in an FD thanks guys