Transmission additive?

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Dec 8, 2009 | 04:23 PM

Tombone

Thread Starter

Burning Brakes

Joined: Nov 2002

Posts: 804

Likes: 1

From: Some where in Ontario Canada

Transmission additive?

I have a 1999 C5 6 speed manual.
The car has approximately 60000 miles.
At 40000 I changed the transmission fluid with Red Line D4 Automatic / Manual synthetic oil.
I think the car could shift with less effort with an additive.
Let me know if you can recommend a product.
Thanks.

Dec 8, 2009 | 05:17 PM

Cybermind

Melting Slicks

Joined: Apr 2009

Posts: 2,479

Likes: 36

Additives are not needed nor recommended in our trannys. I would simply try a different transmission fluid. I know that when I changed my tranny fluid to Mobil synthetic ATF, it greatly improved shifting. However, I think that you can't use synthetic fluid in '99's.

Dec 8, 2009 | 05:25 PM

leeinmemphis

Instructor

Joined: Oct 2009

Posts: 167

Likes: 6

From: Collierville TN

I just picked up my '02 M6 and had Royal Purple put in it. It makes shifting much easier than whatever was in it. I had to order it from Summitracing because I couldn't find it locally. I could find the engine/diff oil but the manual transmission fluid that RP recommended wasn't stocked anywhere locally.

Dec 8, 2009 | 05:32 PM

killain

Race Director

Joined: Aug 1999

Posts: 11,119

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From: SE Pennsylvania

St. Jude Donor '03 thru '26

Oldtimer

Quote:

Originally Posted by leeinmemphis

I have heard of this issue about ten times and almost all of the stiffness and balky shifting was gone after draining and refill with Royal Purple ATF !

Dec 8, 2009 | 05:38 PM

leeinmemphis

Instructor

Joined: Oct 2009

Posts: 167

Likes: 6

From: Collierville TN

Quote:

Originally Posted by killain

I have heard of this issue about ten times and almost all of the stiffness and balky shifting was gone after draining and refill with Royal Purple ATF !

The people at RP recommended Synchromax not atf so that is what I used. They were very helpful in helping me locate the quantities I needed and helped answer a couple of suggestions. Not very often I encounter that level of customer service.

http://www.royalpurple.com/manual-tr...ion-fluid.html

Dec 8, 2009 | 07:34 PM

dobewillie

Race Director

Joined: Mar 2006

Posts: 10,477

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From: lockport n.y

Good link Lee thanks

Dec 8, 2009 | 08:05 PM

johnson-rod

Melting Slicks

Joined: Oct 2007

Posts: 2,375

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Amsoil is OK for the early transmissions. I've had it in mine for the last year or so. Its a MAJOR improvement. Much more than you would think from a simple trans fluid change.

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