The first Chevy full sized truck transmission that is a 5 speed (light trucks, that is) is the NV4500....before that, they were all 4 speeds. The NV4500 is not a cheap transmission, they sell on EGAY for $1000 or so. They are avaliable in both 2wd and 4wd. Most transmissions have a different output shaft between the two models (2wd and 4wd) and changing the output shaft is not cheap either.

The S10 uses a lighter duty T5. There are more versions of this thing than you can count. Here is a good T5 site:

http://www.flatheadv8.org/t5-swap.htm

The later model camaros had T5 trannys that could take a good amount of torque....the banger S10 were lighter.

mike in tucson