I have a '99 S-10 with a stock transmission 4 speed automatic. I want to swap it out with a 5-Speed Auto. I have a 4.3L and asked the guy down at my performance shop if it was possible and he said it was becasue the 4.3's are much like the Chevy small block V-8's...except with 2 cyls cut off. I dont know what kind would be a good kind to get...or if it could be fitted on. Is this possible? If so then what are good transmissions to buy?