Installed a 350 Trans.

[1chance]

Now i need to know how to get the speed odometer to read the MPH Correctly. I know it something to do with the little gear in where the speed cable go. I pulled the gear and counted the teeth there35-P, now what do i need to change, and what the part number? Thanks.

 

[1chance]

Help!

 

[SSedan64]

TH350 Speedo Gears

Check here. >>>> NovaResource.com - Recalibrating GM Speedometers

 

[1chance]

Thanks for the link, but who sells the gears???

 

[chris718]

give me a call i should have what you need

 

[1chance]

Thanks, i think i got the speedo right, now i need to know how to make it shift when im in boost. I think the modulator pulls vacum, and that tells it when to shift, but when in boost it over revs, any ideas?

 

[BOP4ever]

I think you have to install a check valve so you do not pressurize the modulator.

 

[SSedan64]

Thanks, i think i got the speedo right, now i need to know how to make it shift when im in boost. I think the modulator pulls vacum, and that tells it when to shift, but when in boost it over revs, any ideas?

Part #-- VBP-VAC >>>>>>>>>>>>http://www.transgo.com/tough_stuff.php

Application--For trans’s with vacuum modulator and Supercharger or Turbo

Features --Vacuum/Boost Bypass Kit: All trans with vacuum modulator and supercharger or Turbo. Prevents boost pressure from causing runaway line pressure.