400 trans speedometer gear?

[Iceman]

Can you change the drive gear with the trans in the car?(The gear on the output shaft)
Trans is a turbo 400.
Mine has a 18 tooth and it needs a 15 tooth.
Thanks

 

[V6RACER]

You should be able to pull the tailshaft housing and get to it.

 

[Iceman]

I will give it a try!
Thanks!