change driven gear oly?
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
change driven gear oly?
I did a swap from 2.59 to 3.75, I have the correct gears to correct it
blue 45 tooth driven and the grey drive gear. my question is can I just replace the driven gear for now? I will have the trans out in a few months and I can replace the drive gear then. is the 45 tooth driven gear compatible with the stock drive gear? I know the speedo still wont be correct but it will be closer than it is now. thanks
blue 45 tooth driven and the grey drive gear. my question is can I just replace the driven gear for now? I will have the trans out in a few months and I can replace the drive gear then. is the 45 tooth driven gear compatible with the stock drive gear? I know the speedo still wont be correct but it will be closer than it is now. thanks
Le Mans Master
Joined: Dec 2004
Posts: 5,488
Likes: 1,352
I did a swap from 2.59 to 3.75, I have the correct gears to correct it
blue 45 tooth driven and the grey drive gear. my question is can I just replace the driven gear for now? I will have the trans out in a few months and I can replace the drive gear then. is the 45 tooth driven gear compatible with the stock drive gear? I know the speedo still wont be correct but it will be closer than it is now. thanks
blue 45 tooth driven and the grey drive gear. my question is can I just replace the driven gear for now? I will have the trans out in a few months and I can replace the drive gear then. is the 45 tooth driven gear compatible with the stock drive gear? I know the speedo still wont be correct but it will be closer than it is now. thanks
The drive gear is located onto the output shaft with a metal spring clip.
Mine was stuck so I whacked it with a chisel and a hammer and broke it in half. There are two holes in the tailshaft and the springclip has a nipple that goes into the rear hole. The hole closest to the rear bumper of the car. The clip is located on the shaft and the gear goes on over the shaft and is kept in place by the clip. Hope this helps.
Le Mans Master
Joined: Dec 2004
Posts: 5,488
Likes: 1,352
I did a swap from 2.59 to 3.75, I have the correct gears to correct it
blue 45 tooth driven and the grey drive gear. my question is can I just replace the driven gear for now? I will have the trans out in a few months and I can replace the drive gear then. is the 45 tooth driven gear compatible with the stock drive gear? I know the speedo still wont be correct but it will be closer than it is now. thanks
blue 45 tooth driven and the grey drive gear. my question is can I just replace the driven gear for now? I will have the trans out in a few months and I can replace the drive gear then. is the 45 tooth driven gear compatible with the stock drive gear? I know the speedo still wont be correct but it will be closer than it is now. thanks
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
JD the tail shaft would be easy if my bolts to my left catalytic convertor were not stripped out by the person who took it out last
you know I will be changing the convertor, I will fix all of it then.
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Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
No problem other than the ~10% error. Just stick the VSS in upside down and you should be fine. If not, report back to us.
Be sure to snap the metal clip off and snap it back on the other side of the VSS.
Be sure to snap the metal clip off and snap it back on the other side of the VSS.
Race Director
Joined: Feb 2004
Posts: 12,517
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Le Mans Master
Joined: Dec 2004
Posts: 5,488
Likes: 1,352
Somebody please explain this, I've seen it posted alot but when I did my speedo gears it fell together. The VSS went right back in no rotation
necessary. I had 2.59's and went to 3.75's I changed the drive gear and the driven gear. I've also seen it posted you would need a new VSS
several times. What gives ? How come some do and some don't. I would just like to understand how it works.
necessary. I had 2.59's and went to 3.75's I changed the drive gear and the driven gear. I've also seen it posted you would need a new VSS
several times. What gives ? How come some do and some don't. I would just like to understand how it works.
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Somebody please explain this, I've seen it posted alot but when I did my speedo gears it fell together. The VSS went right back in no rotation
necessary. I had 2.59's and went to 3.75's I changed the drive gear and the driven gear. I've also seen it posted you would need a new VSS
several times. What gives ? How come some do and some don't. I would just like to understand how it works.
necessary. I had 2.59's and went to 3.75's I changed the drive gear and the driven gear. I've also seen it posted you would need a new VSS
several times. What gives ? How come some do and some don't. I would just like to understand how it works.
Did the later vettes have the optical VSS? I know some fbody's got optical in '90.
-- Joe
Racer
Joined: May 2006
Posts: 293
Likes: 0
The shaft for the driven gear isn't concentric with (in the center of) the O.D. of the VSS. The the shaft in the two VSSs have opposite offsets to allow for different tooth counts and outside diameters of driven gears. Until it was discovered that rotating the VSS 180* changed the offset the proper amount, a change in the VSS was required, as per the parts book. Driven gears with 35 to 39 teeth take one VSS and driven gears with 40 to 45 teeth take the other.
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
The shaft for the driven gear isn't concentric with (in the center of) the O.D. of the VSS. The the shaft in the two VSSs have opposite offsets to allow for different tooth counts and outside diameters of driven gears. Until it was discovered that rotating the VSS 180* changed the offset the proper amount, a change in the VSS was required, as per the parts book. Driven gears with 35 to 39 teeth take one VSS and driven gears with 40 to 45 teeth take the other.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
If your swap from small gear to large gear or vise versa seems to work without rotating the VSS, you probably have too tight or too loose gear mesh, which will tear up the speedo gears.
Also, the 15T drive gear is slightly smaller than the 17T, so you might be able to get away with a little bigger than 40T driven without rotating the VSS.
Also, the 15T drive gear is slightly smaller than the 17T, so you might be able to get away with a little bigger than 40T driven without rotating the VSS.
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
help
I just took my vss out and the gear I bought does not look right. mine is a gear without a long plastic tail, the new one is blue and has a long tail. does the metal piece come out of the vss?
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
my new gear is style H and the housing is style J on this page
http://www.tciauto.com/Products/Comp...eter_gears.asp
http://www.tciauto.com/Products/Comp...eter_gears.asp
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed