Nope, it came factory with the 4.90. That was part of the XS package.
Oh maybe someday. Right now I don't know how much I will be doing. With little ones and a big move planned and finding $$$ to get the parts with everything right now.I was thinking for the air locker, but i guess it doesn't matter since you didn't buy it.
What year of bed are you looking at?
The Gen I Pickup came with a 81.5" bed.
The Gen II pickup came in a short bed and a long bed.