700R4 speed correction?
Thread Starter
Melting Slicks
Joined: Jan 2004
Posts: 2,992
Likes: 0
From: Henryville IN
700R4 speed correction?
I have 3:45 gears in the rear and need to know what gear to change in the trans to correct the speedometer. The trans I took out and replaced evidently was fixed for this and the new rebuilt one isnt. So if I can take a part out of the old for the new I just need to know what. 
Burning Brakes
Joined: Aug 2001
Posts: 1,038
Likes: 15
From: Brick- Next to the land of Mojo NJ
Burning Brakes
Joined: Aug 2001
Posts: 1,038
Likes: 15
From: Brick- Next to the land of Mojo NJ
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
The easy way is to use the speedo parts from the old trans. There are three parts that can be different. The speedo drive gear, the driven gear and the VSS. If the drive gears are the same color, either red or grey, (likely) you won't even have to pull the tail shaft housings off. Just swap the driven gears and the VSS. The VSS may not have to be changed, but rather than explain it all, just keep the driven gear and the VSS as a pair.
RACE ON!!!
RACE ON!!!
Drifting
Joined: Jan 2002
Posts: 1,606
Likes: 1
From: Las Cruces NM
The speedo gears used for the manuals are the same. I did the same thing, went from 3.07's to 3.45's and had to swap the gear on the tail shaft of the tranny. I re-used the other gear and my VSS. If you are going from 2.59's or 2.73's you'll need the 3.07 VSS. The pn's for everything are on this page. You'll need a grey 15 tooth drive gear and possibly the VSS.
http://www.corvetteforum.net/c4/vett...Gearshtm.shtml
Or, yes, if the speedo was corrected in the old one, you can re-use the old stuff. Yank the VSS, the drive and driven gears.
Chris
http://www.corvetteforum.net/c4/vett...Gearshtm.shtml
Or, yes, if the speedo was corrected in the old one, you can re-use the old stuff. Yank the VSS, the drive and driven gears.
Chris
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
You can see the color of the drive gears through where you pull the driven gear out. If the new and the old are the same color, you won't have to pull the tail shaft housing off. Not a lot of tearing apart to do.
RACE ON!!!
RACE ON!!!
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