I recall Curtis talking about issues when he did his 4.3 swap. The gearbox didn't like the Chevy PS pump, IIRC and it was because it varied pressure with RPMs. Do some searching under Landraider and 4.3. I think the Mitsu pump stays constant regardless of RPMs, but I may have it backerds. My whole house has influenza Bsomethinernuther so I ain't thinkin so clear...

Fasteddy's advice is occasionally sound...