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My 1999 truck was overhauled in 2009 and got a rebuilt GEP motor from 2005 according to the casting.

No way that I know of to get rid of it. When GM stopped manufacturing the blocks and Navistar took over (General Engine Products, or GEP for short) they changed the metallurgy of the block and I believe changed the design a little in order to take care of those issues. Now that we have...

while physically possible, it's really not cost effective if you are trying to do it properly. Requires a bunch of new parts, lots of labor, and in the end most people will recommend that you just install a used 6.5 turbo motor and 4 speed transmission to install instead. These aren't...

doghouse assembly is the engine cover you remove from inside the cab of the truck.

As for what oil to use, any good quality 15W40 will do. Some people argue against synthetic claiming their stuff leaked after using it, but it has better protection than conventional does, especially for extreme weather. As for filters, this list/ranking is pretty comprehensive...

Transmission is easy, look at the shifter. Will either have a park position or not. Park means 4 speed. Engine you should pull the doghouse and look at the oil pump/tach drive...