Help Royal Purple ATF
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,754
Likes: 0
From: Nokomis FL
Help Royal Purple ATF
I replaced the trans fluid in my '99 MN6 last weekend with Royal Purple. The shifting has gotten stiffer, down shifting is almost impossible. If it effected the paper barriers are they gone and need replacing or will changing fluid help? 
Drifting
Joined: Mar 2006
Posts: 1,340
Likes: 2
From: ZHills Florida
St. Jude Donor '08
ETA: I did not use RP ATF, I used their manual trans stuff.
Safety Car
Joined: Jun 2000
Posts: 3,537
Likes: 1
From: Costa Mesa CA
Still, I would try changing anyway to see if it helps, because it may be that the barriers are not gone.
Le Mans Master
Joined: May 2005
Posts: 6,366
Likes: 249
From: Fort Lauderdale, Florida
I hope you didn't use RP ATF. They make a specific fluid for manual trans cars that require ATF. It's called Synchromax. I have it in my car a couple of years and it shifts perfectly. I tried a couple of other brands and the RP was the smoothest.
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Pro
Joined: Mar 2002
Posts: 732
Likes: 138
From: Allen (DFW) Texas
http://forums.corvetteforum.com/show...26&forum_id=49
RP recommends both RP ATF and RP Synchromax for standard transmissions requiring a Dexron III type fluid, but suggests Syncromax offers higher performance.
That said, I couldn't find the thread but do recall some time ago reading one on the forum that said the friction material on the sychros used in early C5 transmissions was different than on later models but I can't recall what year it changed. It's possible the OP's 1999 model uses the older type material and could have been damaged by the fluid.
As another posted suggested, best action would be to drain the RP completely and re-fill with GM fluid to see if things get better. If the synchros have been damaged it won't help, but you might get lucky.
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
AMSOIL ATF
AMSOIL Torque-Drive Synthetic Transmission Fluid
I've been using the ATF in my 02 Z06 on the track for years without any issues.
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AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
