these are for 14cux trucks. no speed limiters. all off 93-95 4.2 RRC's and the 3.9 is from a 95 RRC. Plug and play!
4.2 ecu's are plug in for more power you can feel right away. a must for 4.6 conversions - or ANY higher displacement conversion. $150 shipped
3.9 ecu plug and play to unlock full speed potential. $75 shipped
thanks for the interest. feel free to email: email@example.com