Differential Gear Decision help...

[Mike C]

There is no optional OD for a TH700R4. The first gear is 3.06 and the OD is .70. If your numbers are working out funny it's because something else is wrong.

The 10% jump from 3.73 to 4.10 isn't worth it unless you had to buy new gears anyhow. Before you throw a whole lot of money at it, I would pull the diff cover and make SURE what ratio you have. Sounds like it's going to be 2.73 (unlikely) or 3.07 (likely).

Personal preference, but I dislike the drop on the 1-2 shift with the TH700 and prefer the TH200 4R ratio. 2.74 first gear and .67 OD. 3.73 is perfect ratio IMO and is what I will run in my short step with 29" tall tires.

Figure whichever you choose will be OK. I have 3.07 right now and the 4.10 with OD would give me effectively 2.73 and the 3.73 with the 33% OD would be 2.50.