Thiokol spryte Transmission ratios??

Has anyone in the snowcat community ever made a chart or found the specs to the ford 3 speeds used in the thiokols behind the inline 6 (ford 300)?

I am doing a comparison to allison transmissions right now and the ratios would be helpful.

Thank.

C6 Gear Ratios
First 2.46:1
Second 1.46:1
Third 1.00:1
Reverse 2.00:1


I have a manual at work I can double check for you.

PJL said:

C6 Gear Ratios
First 2.46:1
Second 1.46:1
Third 1.00:1
Reverse 2.00:1


I have a manual at work I can double check for you.

Click to expand...

This is exactly what I was looking for. Thanks for posting it.

Check out this allison mt 643 ratio... Talk about torque in reverse LOL

First...................................3.58:1
Second..................................2.09:1
Third...................................1.39:1
Fourth..................................1.00:1
Reverse.................................5.67:1
* Gear ratio does not include torque converter ratio.

I have used a fair number of Allison AT545 in conversions and have been real happy with the results

About 3inches shorter and half the weight of the MT643
AT545 is SAE 3 and MT643 is SAE 2 That is a big transmission IMO for a snowcat


MECHANICAL RATIOS (RANGE)*
First
3.45:1
Second
2.25:1
Third
1.41:1
Fourth
1.00:1
Reverse
-5.03:1

MNoutdoors said:

I have used a fair number of Allison AT545 in conversions and have been real happy with the results

About 3inches shorter and half the weight of the MT643
AT545 is SAE 3 and MT643 is SAE 2 That is a big transmission IMO for a snowcat


MECHANICAL RATIOS (RANGE)*
First
3.45:1
Second
2.25:1
Third
1.41:1
Fourth
1.00:1
Reverse
-5.03:1

Click to expand...

I am finding that the 542 and 545s seems to be very common and low mileage as well as cheap. I think that will be my go to for this build. Thanks for chiming in.

Do you prefer the 545 over the 542 because of the extra oil pan depth/capacity?? I also noticed most of them come with the parking brake installed on the output shaft. Much easier than adapting the original disc brake setup to fit on it....