grab yourself a chiltons manual at checker/oreilley auto parts
it will tell you what is possible with the engine installed.
if im correct. as i havnt done it yet if its a 2wd you must pull the engine to remove the pan.
if its a 4wd you must disconnect the frond drive assy and move it forward to pull the pan.
as for the rods and mains the book should tell you what is possible and how to get it done.
good luck. please include more info on truck to get a more specific answer.
let us know how it turns out.
1995 S10 LT 4DR 4x4 Stock
2000 S10 LS 4DR 4x4 work in progress ( my tonka toy)
2000 ALERO custom ordered all the bells and whistles
89/93 ranger 4x4 hybrid
1994 Bonneville SSE
2004 grand prix GTP
1968 SS EL-Camino 396-v8 425 HP