OBS to LSx conversion

[Wagonbacker9]

I am putting a 5.3 into a 91 ext cab 2wd, now in order to keep the old drive shaft and new transmission in the proper location will i need 1" set back mount plates or standard mount plates?

I don't know from exp yet, but everything I've read indicates that the LS is 1" shorter, so 1" setbacks are needed to keep the trans in its current location.

I have a question about hooking up a 4l60e to my 89 k1500 transfer case. Will I have any issues or will it bolt right up? Or would finding a 2000+ transfer case be a better idea and would my drive shaft still work it I have to swap Trans cases?

NP241c bolts up.

What all will need to be done on the harness if I'm swapping into a 1980 K10? (mainly switches such as brake ignition etc?)
Also will the stock T case from an 87 Suburban bolt on to the 4l80e?

Anyone?

Brakes have nothing to do with the engine... for wiring info look on lt1swap.com. As for tcase what trans and tcase are in it now?