which would be faster, a T125 with a 3.42 gear or 4T60 with a 3.73 considering weight difference? Does anybody know the weight difference between the two?

I guess if I knew the wieghts and I had a 1/4 mile prograam I could figure this out. Unfortunately I don't have either. Still waiting

You also have to remember that 4T60 1 & 2 are geared lower than TH125c. This means even if both units have the same transaxle ratio, the 4T60 will have a lower total ratio in 1 & 2. (All the gear numbers are in my cave.)

I don't know that the 4T60 is heavier by enough that you'd notice it on the track much. I don't have the weights handy. The lower gearing would probably more than make up for it.

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