700R4 - Cable Speedometer

The 1992 700R4 I picked up came out of a Camaro that used an electronic speedometer. That’s useless for my ‘67 cable-driven dash, so I had to swap the electronic housing for a manual cable unit. While electronic speedometers are technically more precise and don’t have cables that bind, they require a digital converter or a full dash swap. I’m sticking with the analog needle—it fits the car.

I’m holding onto the original electronic housing in case I ever move to a digital unit, but for now, the cable is staying.

A view into the transmission tail with the original 1992 electronic sender removed. You can see that clean pink fluid from the recent flush the previous owner mentioned.

Comparing the old electronic drive gear setup to the new manual requirements.

Accuracy is the biggest headache with these swaps. I checked the stamp on our Hankook 15” tires and factored in the 2.73 rear gears. After a quick session with an online calculator, a green 34-tooth driven gear was the winner.

With the drive gear removed, it’s time to shelf this modern tech in favor of classic dependability.

The brand new 34-tooth green driven gear.

The new manual cable housing kit including the required seals and clip.

I spent about $120 for the housing, the gear, and some fresh seals from Classic Transmission Solutions. The parts showed up a week later and the swap was straightforward. That’s one of the prerequisites done to swap from the TH350 to our newish 700R4.