I put a T-5 from an 84 S-10 into my 57 3/4 ton truck with a 235 ci engine and it works great. I too had the 4:57 and I changed it out to a 4:10 from a 72 4x4 that I picked up at a local salvage yard and with 235x85x16 tires I can cruise at 65 mph @ 2500 rpms. Has really chaged the character of my truck for the better and I would highly reccomend this conversion.