speedo recalibrate

Speedcal works too. but it cost $50-$100

Bosko5.0 said:

Speedcal works too. but it cost $50-$100

Click to expand...

+1....worth it in my opinion. That way you can correct it for tire size, rear gears, etc...

try latemodelrestoration.com. i know they have a ton of different speedometer gears and charts that explain which one will correct the speedo for which gear ratio

A different way of saying what was said above

You basically got two gears here

1) Driven gear ..........
the one everybody replaces which is a snap to take out on the side
of the trans tailshaft

2) Drive gear
this one is installed INSIDE the tailshaft and drives the driven gear

To replace this gear.........
you gotta take the tailshaft off the main part of the trans

410's are too steep to make things right by just changing the driven gear
because none available will work

You gotta change out that drive gear so it then will be a good companion
to work with the driven gears which are available

I'd so the Speedcal thing before going to all that work

Hope all that stuff makes sense

Grady

I know this is an old thread but anyone know where I can get the drive gear that goes in the tailshaft?

here you go.
Mustang Speedometer Gear & Speed Correction at LRS - Same Day Shipping!

or you can get the speed cal here.
Speed Calibrator - SpeedCal at AmericanMuscle.com - Free Shipping!