I just changed the gears from 2.73's to 3.42's and bought one of these ratio adapters to get the speedo corrected.

Anybody have a pic of where the speedo cable comes into the transmission. I couldn't see anything real good.

 

I may be wrong here but I do believe that your speedometer is electronic and not cable driven. Did you change out the speedo drive gear and the speedo driven gear in the transmission when you swapped gears?

 

I did not change out the speedo gear. Guess that is my next project.

 

Just get the right drive & driven gears (driven has no shaft to it on your car) for a 3.42 or 3.45 rear A4 f-body. That adapter isn't gonna do anything for you since yours has a mechanically gear driven VSS. Your drive will be 15 or 17 tooth. IIRC, 15 is grey, 17 is red. If it needs changed, it's effort. If it's just the driven, it's cake.

-Matthew

 

WOW! Great moments in timing.

Just got my Chevy High Performance Magazine in the mail and it has an article about a thirdgen camaro that just went from 2.73's to 3.42's. They say it takes a grey 15 tooth drive gear and a yellow 41 tooth driven gear.

That explains it so even I can under stand it.

 

correct, but I think you also need a different vss

 

I don't think the article said anything about changing the vss. Maybe I should read it again.

 

All you should need is the correct drive & driven gears. About a month ago we swapped the rears in my brothers 1989 T/A from 2.73's to 3.42's. I removed the tranny tailshaft housing and swapped the drive gear and pulled the vss sender and changed the driven gear. His speedo has been right on without a problem.

 

To pull the tranny tail section I'm guessing you have to remove the drive shaft.

 

Yes.

Also, I just read that article and they did mention something about 90-92 cars needing a "completely electronic" solution. You might want to look into it a little more in depth before ordering anything...

 

No he doesn't. He needs drive and driven gears. It's still a 4004 pulse per mile VSS setup that he needs whether he has 2.73 or 3.73 gears.

Again, if you search Tricksters posts, he posted scans from svc. manuals of a lot of the GM factory speedo gear combinations. Once you find those, buy the right tooth count gears, install them, done. Then the car will be setup 100% factory, everything will work as intended, the car won't be "hacked," and the cost is minimal.

Chevy High Performance probably has the wrong gear counts unless they went by GM specs. All online web based speedo gear calculators are wrong per GM installed gears.

The only annoying part about doing the gears is the fact that you have a torque arm. My cars don't. It's an easy job.

-Matthew

 

It's a mechanical gear driven electronic VSS. The factory put the same gear counts in a 1989 Camaro with 3.42s as they did with a 1992 Camaro with 3.42s, but the driven gear is a different style and they installed a VSS instead of a speedo sleeve.

 

Right, it has the same pulse VSS, but with the different sized gears you may need a different VSS with an offset shaft. I can't remember the part # offhand, but if you do a search you will find it.

 

[QUOTE]Originally posted by jmd
It's still a 4004 pulse per mile VSS setup that he needs whether he has 2.73 or 3.73 gears.

i thought it was a 2000 ppm vss??