[Critter]

Originally Posted by raycow

All else being equal, I would always go for an overdrive transmission on any vehicle that gets driven at highway speeds.

Yes, the 700R4 will bolt up to your 250. It will be slightly more difficult to install than the TH350. You will need to shorten your driveshaft, cobble the TV cable mount and wire the converter lockup. I'm not mentioning the radiator, cooling lines, crossmember, and shift linkage because you will have to do those with the TH350 too.

Ray

100%. The th350 might be slightly easier to swap but the overdrive 700r4 would would be much better in the long run. A few guys around here have made the 700r4 swap with a 6cyl, I'm sure somebody will jump in with more details.

An even better swap in many peoples eyes would be a 200r4 overdrive...but they are harder to find.