if i do 60, it reads 80, i only swapped transmissions. 700r4 to a 700r4, worked fine before the swap, any ideas guys?

the gear on the transmission shaft was the same as mine, we swapped the housing cus mine is not electronic the new one was, caprice tranny.

 

So both the drive and driven gears in the new trans were the same as the old?

JamesC

 

i would think so, both same transmission, i know the gear on the shaft was identical.

 

Transmissions have different drive and driven gear combinations to accommodate the rear end ratio. I suggest you verify that the drive gear is the same. Perhaps the following will be helpful:

https://www.thirdgen.org/forums/tran...eedometer.html

JamesC

 

Nope.

When the speedometer, speedometer cable, driven gear housing sleeve and driven gear are all the same but the speedo now reads differently, it's impossible for the drive gear in the trans. to be the same.

It would have been easier to swap that gear before you rushed to get the new trans. in.

The Camaro one might be a 15 tooth. The Caprice one is probably 17; maybe 18 tooth.

 

both gears on the tailshaft were green, possible something inside is different?

 

there is nothing different inside.the two gears are the only thing that sets your speedo.the tooth count must be different, regardless of the color.

 

This from the link I provide above:

"Beware that both 34 tooth and 42 tooth are both green."

JamesC

 

hecounted the teeth, perhaps miscounted? so can the old one be taken off?

 

thanks for all of the replies too...

 

Post #9 of the above link. Good luck with your project.

JamesC

 

Jack, the rear up on stands, put the trans. in neutral, mark the gear in there w/ a sharpie and count the teeth.

You swapped the trans. so you can do the gear swap. This time, once the tq. arm & driveshaft are dropped and the trans. is off the crossmember and drooping, unbolt the tail and once that's off, work the gear past the clip. It's easy, all things considered.