I would only consider a 4R or 6R conversion.
Over a remanufactured? Conversions make me nervous but I'll start looking into that. It just sounds expensive.
Found an online place that sells them for $1870 to my shop with 3 year unlimited mile warranty.
"-Remanufactured pump, with new line bore bushings to eliminate leaks and provide superior flow and durability.
-Remanufactured valve body, with complete system correction and recalibration kit, improves pressure control and shift quality.
-Remanufactured and improved torque converter tested for leaks, concentricity, and balance. Upgrades exceed OE requirements and eliminate the possibilities of front seal leaks, premature bushing wear, and vibration.
-All new, bushings installed in key locations to improve internal fluid flow control and fluid pressures.
-Complete system correction and recalibration kit installed to address several OE flaws. Modifications include updates to servos, the PR system, and valve body accumulators.
-Heavy-duty recalibration kit installed to reduce slippage and increase durability.
-Complete road simulation using a dynamometer testing program called C.A.R.S. (Computer Aided Road Simulation). Every transmission is cold and hot tested before shipment."
Larger pan and cooler absolutely.