speedo gear swap
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
Drifting
Joined: Oct 2004
Posts: 1,477
Likes: 80
From: Hawaii
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
Where are the drive and driven gears located? My manual shows a Speed sensor before the tail shaft on the drivers side, is this the VSS ?
Best place to purchase ?
Best place to purchase ?
Last edited by C4vettrn; Oct 30, 2010 at 01:55 PM.
Drifting
Joined: Oct 2004
Posts: 1,477
Likes: 80
From: Hawaii
You are looking at the right place in the manual.
These part numbers are gm part numbers and should be available from GM.
Drive gear p/n 8640517 (Red 17 Teeth)
Driven gear p/n 25513049 (Green 42 Teeth)
VSS p/n 10456092
I hear that you may have a hard time finding the VSS from GM now days, and can also try NAPA under p/n ECH VSS214 for the VSS.
Or you can try
http://www.transmissioncenter.net/sp...__va.htm#700r4.
Item number #55, but make sure with them that, that is the right VSS.
Last edited by James93LT1; Oct 30, 2010 at 02:32 PM.
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
Awsome website for info. So acording to what you guys are saying is my trans should allready have a 17 T driven gear and all I need is the $11.00 plastic 42 T driven and not the actual VSS sensor $$$
I will call them Monday to verify, thanks you guys were very helpful.
I will call them Monday to verify, thanks you guys were very helpful.
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Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
outcome
Here is what I found out from PATC. (If you call ask for the Corvette guy) I was told I would need a 41 T driven But they don't make them anymore so I would have to go with a 42 T. The problem with this is the stock sensor or VSS will only except a 38 T so you have to buy another VSS which excepts the next series of higher numerical Teeth for $90. The good part is if you already have your drivetrain apart and can pull the rear housing on the tranny then you can buy a 15 T drive gear for $15 and save some cash. either way will get you the correction needed it just depends on what you want to do. For me it was well worth pulling 4 bolts and removing the tail to save $90.
So that is my story for a corrected speedo when swaping the 2:59's fpr 3:07's. If you want to live with the speedo being off it equals a 18-20% faster speedo than what you will actualy be driving. Thanks for all who helped.
So that is my story for a corrected speedo when swaping the 2:59's fpr 3:07's. If you want to live with the speedo being off it equals a 18-20% faster speedo than what you will actualy be driving. Thanks for all who helped.
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Here is what I found out from PATC. (If you call ask for the Corvette guy) I was told I would need a 41 T driven But they don't make them anymore so I would have to go with a 42 T. The problem with this is the stock sensor or VSS will only except a 38 T so you have to buy another VSS which excepts the next series of higher numerical Teeth for $90. The good part is if you already have your drivetrain apart and can pull the rear housing on the tranny then you can buy a 15 T drive gear for $15 and save some cash. either way will get you the correction needed it just depends on what you want to do. For me it was well worth pulling 4 bolts and removing the tail to save $90.
So that is my story for a corrected speedo when swaping the 2:59's fpr 3:07's. If you want to live with the speedo being off it equals a 18-20% faster speedo than what you will actualy be driving. Thanks for all who helped.
So that is my story for a corrected speedo when swaping the 2:59's fpr 3:07's. If you want to live with the speedo being off it equals a 18-20% faster speedo than what you will actualy be driving. Thanks for all who helped.
All 3:07 gear cars came from gm with a red drive gear, and 42 tooth driven gear.
The sensor may be rotated 180 degrees to correct the offest, and re-installed. 5 minute project at most.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
It will take a decent car, and turn it into a slug. Unless you plan to go racing on the salt flats, and hit 200 mph, 2:59 (in my opinion) should never have been produced.
