a muncie, though a great tranny has no overdrive... this will be difficult for freeway driving depending on your gearing and tire size.. 1994 and above carry 4l60e transmissions, which is basically a 700r4 electronically controlled... if its the 4l60 your trucks computer will have to be tuned to not accept input from the transmission sensors and run a different harness to the motor... i would check out th 4l80e which is a much stronger transmission.. manual conversions are always difficult and on chevy trucks very time consuming.. on an older truck it would be no biggie... try looking at newer 5 speeds because some chevys did come with factory 5 speeds.. if that is the case you could get all the parts to do the swap from a dealer and do it in a weekend since all the 5 speed holes and such are still on your truck.. but you may have to cut them outor do some rearranging to get to them...