Welcome to the Corvette Forums at the Corvette Action Center!

Question: 1986 gear driven speed sensor


New member
Jan 4, 2020
Ofallon IL
Hi all. I have an early 86 Z51 and the speedometer quit working after a transmission flush. The car had not been driven but about once a year the last 13 years.

I checked all the connections on the instrument cluster and all is good there.

I ordered a new speed sensor but what showed up is magnetic. Come to find out I have the gear driven electronic speed sensor.

I replaced the driven gear and the speedo worked intermittently. So, I’m thinking the drive gear needs to be replaced as well.

I am curious if any of you have ever converted from the gear driven electronic sensor to the magnetic? If so, what drive gear would I use and how would I match it to my gear/tire ratio?

I just figure if I gave to pull the back off the transmission I would rather convert the drive gear to something that will work with the magnetic sensor.

Thanks in advance for any help.

Sent from my iPhone using Tapatalk

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Win Both Corvettes!

Win Both Corvettes and Get Extra Bonus Tickets Now!

Supporting Vendors


MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!


Dead Center Foundation


Advertise with the Corvette Action Center!


Top Bottom