Changing tire sizes

[V@rmint]

Anybody change tire sizes to speed up or slow your tractor down? My 100 is too slow in second gear and too fast in third. Is there anything else I could do to change the gearing?

[william1041200]

You can completely regear your trans. I know of a company who makes and or sells about anything you could want for tractor pulling. You can buy everything brand new, except the cast iron case from these guys. I Do Not Know if I am allowed to say who they are, but You can search the internet for flathead performance

[JaysNJcub127]

call Rich Patton and get a used creeper setup for like $200.......cheeper than new tires !

[ihnick]

a creeper wont solve his problem. 3rd gear in low is slower then 1st gear in high

[mickb72]

Hi Varmit, You must have a 16 or 17 tooth 2nd gear.(just the right speed for my 100 mowing) Most other tractors had a 19 tooth 2nd gear, ( just do a 2/3 combo gear swap) I even have a couple sets around want to trade?

[Battlewagon]

The only way he is gonna "fix" the problem is to regear the transmission. A change in tire size may fix the issue with one gear but it will amplify the problem with the other gear. A taller tire will make second faster but it will also speed up third. And on the other hand a shorter tire will make 3rd gear slower but it will slow down 2nd also. A creeper is gonna make everything slower, a bunch. Kinda like dropping a 4X4 into low range.

[Merk]

There are 2 ways that V@rmint could use to change the rear wheel speed in 2nd gear.

One way is to change the upper gear in the reduction housing from a 12 tooth to a 13 tooth gear. The 13 tooth gear is not a factory gear from Cub Cadet. You will have to go to a place that sells puller parts for Cub Cadets. The 13 tooth gear is better known as a 10% overdrive in the sites that sells puller parts. Expect to pay $75 to $100 for the 10% overdrive. You will need a gasket, seal and bearing to do the job.

Another way is to change 2 gear. during the production run the 70 and 100 had 2 different 2nd gear ratios. The early serial numbers (65458 to 96765) had a 16 tooth 2nd gear and later 70-100s (96766 and above) had a 19 tooth 2nd gear. It sounds like you have a early serial number 100.

Cub Cadet had 3 different 2nd gear ratios. There was a 16 and 19 tooth gear that the Cub Cadet 70 and 100 plus later models used. The other one was a 17 tooth. I have a 100 with a 16 tooth and a 70 with a 19 tooth. My 100 like V@rmint's 100 is a little slow when pulling the moldboard plow. My 70 seams to be a little too fast when pulling the plow.....runs out of power. Biggest part of the problem is the difference in horse power between the 2.
I want to change the 2nd gear in my 100...haven't deside which gear (17 or 19 tooth) I will use. I may try the 10% overdrive set up first since I have one to try.

A little side note:
Cub Cadet did have a problem with 16 tooth gear not holding up. I had a 12 inch plow behind my 100 and haven't broke the gear. I do plow in 2nd gear. The motor is modified in my 100...making more power than it did from the factory.

The creaper gear has a 4 to 1 reduction when it is engage. It will be too slow to do any good besides tilling, running a snow thrower or slow tractor racing.

[V@rmint]

How hard is it to swap out the gears? I've done a lot of engine work, but don't have much transmission or differential experience.

[Merk]

There is a Chassis Service manual for your 100 in the Technical Section of this site. It has the information to take your trans apart.

[V@rmint]

Thanks for the input, you guys are full of it (information that is) lol. After looking at the manual, I think I'll just pick up a pair of used 13" wheels and tires. I just need a little more speed in second gear when I mow. I realize that it will make third gear faster but it's so fast now that it's virtually unusable anyhow. I can easily switch them back if it doesn't work the way I want.