Tremec tko II 500 speedo gear

ebustin · #1 (**permalink**) 03-19-2010, 12:08 AM

What speedo gear do I need.. Tires rear 315/35/17 3.70 gear ratio..Also if I go with electric speedo what sending unit do I need for the tremec

mikeforte · #2 (**permalink**) 03-19-2010, 04:43 AM

Hi Ed,
You'll need a 20.7 tooth gear for your speedo. Knowing a 20.7 tooth is impossible you can install a 20 tooth gear which the speedo will display higher speeds or a 21 tooth gear and your speedo will display a lower and more accurate speed.

blykins · #3 (**permalink**) 03-19-2010, 04:53 AM

Ah c'mon Mike.....you mean you can't take a 20T gear and glue 3/4 of a tooth onto it?

ebustin · #4 (**permalink**) 03-19-2010, 09:25 PM

What about using a electric speedo, what parts do I need.

blykins · #5 (**permalink**) 03-20-2010, 05:08 AM

You can use a Speedcal (yes, that's what it's actually called) to calibrate your speedometer. They are $110 + shipping.

It wires in, in-line, and has DIP switches to make adjustments. I use them on later model Mustangs when I swap rear gears.

Tom Kirkham · #6 (**permalink**) 03-20-2010, 07:17 AM

Quote:

Originally Posted by ebustin

What about using a electric speedo, what parts do I need.

The sensor is already in the transmission. So you will need the pig tail to connect to the sensor and the speedo.

blykins · #7 (**permalink**) 03-20-2010, 06:24 PM

I thought he needed a way of correcting the speedo with a gear change.