A500/A518 Cars, OD and L/U on a toggle or auto?

I run a different OD trans with lock up 3800 rpm stall converter and ended up using a single toggle to lock up the converter, but it will only lock up when in 4th OD.

I never felt the need to lock up the converter in the first 3 gears. I did buy a high quality torque converter so it is very efficient. In other words, at light throttle it only slips an additional 300 to 375 rpm when not locked up.

Around town, I leave the shifter in the 3rd gear position, so when I shift into 4th or OD, the lock up toggle is almost always in the lock position, it goes into OD and locks a split second later. I only use light throttle when shifting into 4th to ease the load on the lock up clutches. It's basically my freeway cruising gear.

I flip the switch off if I want to hit 4th with hard throttle at freeway speeds.