New shifter gasket

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10-21-2009, 10:55 AM

sweetcoupe

Thread Starter

Join Date: Dec 2007

Location: NJ

Posts: 36

New shifter gasket

Do you need a new gasket if you pull the shifter? Thats gonna be my deciding factor lol

10-21-2009, 11:01 AM

cbbass123

1st Gear Member

Join Date: Feb 2009

Location: Texas

Posts: 138

No gaskets...rtv silicone

10-21-2009, 01:18 PM

CopNaStang

1st Gear Member

Join Date: Nov 2008

Location: Indiana

Posts: 149

The Tremec Manual I have for the 3650 shows Mobile 1 synthetic. I switched mine out about a month ago and it shifts like butter. Mine didnt have Mobile 1 from Ford. It only had 14K on the odometer and shifted like poo. Much better now. Has anyone run Mobile 1 for an extended period of time?

10-21-2009, 08:07 PM

0440thgt

2nd Gear Member

Join Date: May 2008

Location: Kentucky

Posts: 431

Has anyone tried Royal Purple Synchromax in these trannies????

10-22-2009, 01:59 PM

CubanoGT

2nd Gear Member

Join Date: Mar 2008

Location: California

Posts: 363

yea i want to know more about the royal purple trany oil since im already using it on the engine and will be using it when i chabge my gears

11-12-2009, 06:59 AM

sweetcoupe

Thread Starter

Join Date: Dec 2007

Location: NJ

Posts: 36

Ive heard royal purple is good (but expensive) and synthetics are not. It eats away at the internals. So either royal purple or a syncromesh brand or mercron base oil should be good

11-12-2009, 09:02 AM

cliffyk

TECH SAVANT

Join Date: Dec 2006

Location: Saint Augustine, FL

Posts: 10,938

Get one of Cobra Bob's gaskets and it will make life nicer than cleaning off the gook each time you yank the shifter...

The warning about not using synthetic ATF is left over from the Borg-Warner T-5 and early Tremec T-45, and may perhaps be so--however I have never seen any solidly documented reports proving it.

Tremec recommends Mobil 1 for the 3650.

From the 3650 rebuild manual:

RP Synchromax is a synthetic, I have been running it for over 60k miles (changed it at 50k) with no problems...

RP states clearly on their site that:

Quote:

Synchromax is fully compatible with all types of friction materials. It provides excellent corrosion and oxidation protection without affecting the soft metals commonly found in manual transmission synchronizers.