4 speed Mods

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Aug 14, 2006 | 03:29 AM

CarShowDVD

Thread Starter

Instructor

Joined: May 2006

Posts: 122

Likes: 0

From: Dana Point Ca

4 speed Mods

Any way to change the 1:1 fourth gear from to a 0.71 or 0.57

Like a OD gear?

Lowest usable gear ratio?

Anyone ever try this?

Sound crazy or make any kind of since?

Aug 14, 2006 | 08:36 AM

69ttop502

Le Mans Master

Joined: Mar 2001

Posts: 6,240

Likes: 1,013

From: Watkinsville, GA and Glen Cove, NY

Go to www.autogear.net. They make an overdrive 4 speed Muncie.

Aug 14, 2006 | 04:36 PM

CarShowDVD

Thread Starter

Instructor

Joined: May 2006

Posts: 122

Likes: 0

From: Dana Point Ca

Thanks not too much info there.
Looking to get better MPG on highways.

Aug 14, 2006 | 04:51 PM

Kalway

Safety Car

Joined: Dec 2004

Posts: 4,071

Likes: 0

From: San Diego CA

If I were to try and make the 4 speed muncie an OD unit I'd change all 4 gears to a ratio that the 700R4 or 2004R use. That way it doesn't have an ackward shift feel.

Aug 14, 2006 | 04:57 PM

72Tornado

Pro

Joined: Sep 2004

Posts: 690

Likes: 0

From: Madison WI

Couple different ways...completely change all the gear ratios, or (much better idea) install a GearVendors Under/Overdrive unit. They're very trick, and will essentially make your tranny an 8-speed, giving you a "1st-and-a-half," "2nd-and-a-half," and so on. It shifts using a planetary gear set (like an automatic) to go from whatever gear you are in into the overdrive version of the gear - think of it like having two rear ends that you can switch between however you want. The units are pricey but can be picked up on eBay for under $1000.

Aug 14, 2006 | 05:14 PM

BerniesVette

Melting Slicks

Joined: Oct 2004

Posts: 2,662

Likes: 8

From: Knoxville Tennessee

I installed a T5 in my '79 for $1,200.00. Best mod I have ever done. Went from turning 3400 rpm at 70 to 2100 rpm!

Aug 14, 2006 | 05:23 PM

Eddie 70

Race Director

Joined: Feb 1999

Posts: 19,659

Likes: 34

From: Lenoir City Tennessee

Ci 6, 8 & 10 Veteran

St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15

I have added a Keisler 5 speed OD tranny to mine. Works like a champ.

Aug 14, 2006 | 05:33 PM

Gordonm

Race Director

Joined: Dec 1999

Posts: 19,610

Likes: 778

From: Forked River NJ

Quote:

Originally Posted by Eddie 70

I have added a Keisler 5 speed OD tranny to mine. Works like a champ.

Would not go back to a 4 speed.

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Aug 14, 2006 | 06:08 PM

carbster09

Burning Brakes

Joined: Oct 2002

Posts: 914

Likes: 14

From: Aberdeen, Scotland

Gear Vendors ... ?

I really like the Gear Vendors idea. Has anyone done it or have pictures?

carbster

Aug 14, 2006 | 07:02 PM

#10

Kalway

Safety Car

Joined: Dec 2004

Posts: 4,071

Likes: 0

From: San Diego CA

Quote:

Originally Posted by carbster09

I really like the Gear Vendors idea. Has anyone done it or have pictures?

carbster

Looks rather heavy and I'm not sure how well it'd fit in our transmission tunnel. I'd rather just go with a transmission designed with an overdrive.

The gearvendors idea has been around since like the 50s/60s. Old Triumphs came with those things.