I havent had any 3.8 Jasper motors, but we went through a bunch of 5.7L's and trannys in our 94 Chevy Z71. The last one we put in before selling was crap. The valves were tapping so loud I think a deaf person could have heard it. No power, and I think within three years we replaced the Jasper tranny
(4L60) 3 times