VSS/ring and pinion?
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Joined: Mar 2001
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From: Arlington Heights Illinois
VSS/ring and pinion?
if l were to change the ring and pinion on my 1990 IROC Z TPI 305 would the VSS compensate for the speedo offset, or would l have to buy a new gear for the cable? about how much do the speedo recal. gears run for? anyone know?
thanks a lot guys
thanks a lot guys
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Joined: Apr 2000
Posts: 223
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From: Wilmington, IL Age: 35
Yes.....When you do a rear gear swap, you will need to do a VSS gear swap if you want the speedo to read correctly.
The procedure is slightly different for the mechanical senders versus the electrical senders, but you still need to get the proper VSS gears.
A recalibration box is offered by I believe www.speedometerworks.com , But it goes for a pretty price if I remember correctly. You can use the recalibration box if GM doesn't make the VSS gearset for a non-factory rear gear size...(ie. 4.10 etc.)
------------------
86 Trans Am WS6 Black with tinted windows, shaved door handles
ZZ4, Mini-ram, true duals, LT4 HotCam, AFR 195 heads.
***Too many other mods to mention***
"In the future, cities will become deserts,
roads will become battlefields, and the hope of mankind
will appear as a stranger" The Road Warrior
The procedure is slightly different for the mechanical senders versus the electrical senders, but you still need to get the proper VSS gears.
A recalibration box is offered by I believe www.speedometerworks.com , But it goes for a pretty price if I remember correctly. You can use the recalibration box if GM doesn't make the VSS gearset for a non-factory rear gear size...(ie. 4.10 etc.)
------------------
86 Trans Am WS6 Black with tinted windows, shaved door handles
ZZ4, Mini-ram, true duals, LT4 HotCam, AFR 195 heads.
***Too many other mods to mention***
"In the future, cities will become deserts,
roads will become battlefields, and the hope of mankind
will appear as a stranger" The Road Warrior
Member
Joined: Apr 2000
Posts: 223
Likes: 0
From: Wilmington, IL Age: 35
If you have the electric VSS, and you want to switch to the 3.73 gears out back, you will need the following gear set.
One 15-tooth drive gear, and one 45-tooth driven gear. That is the proper setup for 3.73's
Here's a quote from Glenn on the DIY PROM Board:
[This message has been edited by Steves ZZ5 (edited May 02, 2001).]
One 15-tooth drive gear, and one 45-tooth driven gear. That is the proper setup for 3.73's
Here's a quote from Glenn on the DIY PROM Board:
<font face="Verdana, Arial" size="2">Originally posted by Glenn91L98GTA:
There are two methods to correct the speedo for a VSS car (which yours and mine are): 1) Install a Cyberdyne box that alters the signal for about $90 (last time I looked) and 2) swap the speedo gears.
Swapping the speedo gears on an automatic involves replacing the gear on the output shaft of the transmission (this is about 1 to 1.5 hours of shop time max). This is the drive gear.
Then there is the driven gear which has the VSS sensor connected to it. It takes less than 15 minutes once the car is lifted.
Go down to your local GM dealer and ask them for the time and labour quote. And then use that to negotiate with some of the smaller shops. As for that guy, find someone else.
It is similar for a manual tranny but they use different gear combos and I am not sure if they are available.
You should act fast in getting the combo from GM. I understand that the cable version is no longer available and probably the VSS version might get discontinued soon. I picked up my speed gear combo a year ago as I was planning to install 3.73 gears. I now have a complete 3.73 posi rear end...just have to wait for spring to do it.
But most assuredly, you can only correct for a gear change with either speedo gears or a Cyberdyne box.</font>
There are two methods to correct the speedo for a VSS car (which yours and mine are): 1) Install a Cyberdyne box that alters the signal for about $90 (last time I looked) and 2) swap the speedo gears.
Swapping the speedo gears on an automatic involves replacing the gear on the output shaft of the transmission (this is about 1 to 1.5 hours of shop time max). This is the drive gear.
Then there is the driven gear which has the VSS sensor connected to it. It takes less than 15 minutes once the car is lifted.
Go down to your local GM dealer and ask them for the time and labour quote. And then use that to negotiate with some of the smaller shops. As for that guy, find someone else.
It is similar for a manual tranny but they use different gear combos and I am not sure if they are available.
You should act fast in getting the combo from GM. I understand that the cable version is no longer available and probably the VSS version might get discontinued soon. I picked up my speed gear combo a year ago as I was planning to install 3.73 gears. I now have a complete 3.73 posi rear end...just have to wait for spring to do it.
But most assuredly, you can only correct for a gear change with either speedo gears or a Cyberdyne box.</font>
[This message has been edited by Steves ZZ5 (edited May 02, 2001).]
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