[B. W.]

I worked for a company that had a fleet of GM trucks in the 70's & 80's. We converted every 203 we had. I can't remember ever having an issue with them. I believe they picked up fuel mileage but can't remember that either! (but what would that be? From 8 mpg to 10?) The trucks were loaded heavy & run hard. I don't remember the name of the conversion kits but they were similar in design.

With that said, my DD is a 79 GMC K25. It still as the full time slugs in the axle but someone converted the T-case. (I'm guessing the PO took the lockout hubs with him) It has slop in the case when engaging 4wd & has gotten worse over the years. It's so bad now that I need to repair or replace it. This truck has been worked hard plowing & hauling cord wood.