Egg1456

iTrader: (2)

Have any of you guys had problems using Royal Purple Synchromax in your t56?

jmd

iTrader: (4)

There have been posts about it not being good for the blocker ring frictions. Search and read.

Dexron is fine. Use it.

thesource

iTrader: (60)

Used it a many many times without issues.

Egg1456

iTrader: (2)

would that be because it is a synthetic

1 FMF

iTrader: (1)

I've tried royal purple syncromax, was quite a few years ago, i would get syncro zing noise when shifting around town. Ran it for less than 1000 miles, changed it out with pennzoil synchromesh (same as gm part #12345349). have almost 60k on car now with no real shift problems, 02 ss.

BlackScreaminMachine

iTrader: (17)

Stay away from R/P.

I am a big Synchromesh fan. I do though want to try out GM Synchromesh FM

FM standing for Friction Modified. Heard some good things about it.

BAMF

I had it in my last trans and liked it, it wasn't stiff on cold mornings like the dextron oil I'm using now.

X-ray

iTrader: (6)

The big boys like Tick Performance always recommend regular old Dexron III. I use pennzoil syncromesh.

I would stay far away from RP for my transmission. Have heard too many bad things. If you're gonna use a synthetic, use Mobil 1 synthetic ATF.