Swapped my stock 87 trans am rear end (2.73) to a Camaro SS 3.42 rear end, love the results. transmission is the700R4. My speedometer is obviously off now, about 15/20 miles/hour higher than normal.


This car has an electric speed sensor in the car, any idea on where I can get the correct speed sensor to fix this issue?


Thanks!


Tires are stock.

 

do you have a cable or VSS speedo?

 

Speed sensor looks like the attachment

 

https://www.thirdgen.org/forums/trans...eedometer.html (Sticky: figuring speedometer)

 

that's fine you have VSS or vehicle speed sensor. but there is still a gear inside that spins that and that's the gear you change to correct the speedo hope this helps

 

Thanks, that really does help!

 

You are going to need to change all 3 pieces,....

Your originally 2.73 geared car 'should' have a 17 tooth RED DRIVE gear and a 39 tooth DRIVEN gear...... and a VSS that's good for 39 tooth and lower gears.

You will need:

a 15 tooth GREY DRIVE Gear ( cable and electric use the same DRIVE gear )
A Electric VSS 41 tooth DRIVEN Gear
A 40-45 tooth Electric VSS

Here's a picture of the VSS and the tooth range that will fit properly on this sending unit:




I've got the correct eleceric VSS and the proper Yellow 41 tooth Driven gear you need; $90 shipped. ( Sorry - I don't have the Grey gear, but at least that one is pretty easy to find. ) Send me a PM for more info if your seriously interested.