Speed sensor/speedo gear selection

[Sleeper1987]

Ok guys i done a TH350 swap on my T. Now i need to buy the correct speedo gear my VSS is showing about id guess 20-29 mph off judging by feel.

It has the large speedo head/gear like the later 700r4's and 4l60e's

Currently it has a red gear on the head and a yellow gear on the tailshaft

Any recomended speedo gear?

275/60/15 tires

3.42 gear

TH350


I relize this should be in the trans section i guess but it should get more responces here and i need to get this repaired before i get a ticket

 

[MeanBuicks]

Speedometer gear calculator.

Speedometer gear part numbers.

 

[Sleeper1987]

Speedometer gear calculator.

Speedometer gear part numbers.

Ok now i feel stupid because it tells me N/A or NaN when i type in the info

19 teeth on the drive gear on tailshaft

 

[Lee_Burough]

I'd call these people and describe exactly what you have and they will be able to tell you what you need.