Newbie to the sierra world (been a mk1 xr2 fan) i picked up a sierra xr4i 4x4 with a 2.8i in it recently.

My question is could i fit a yb 4x4 running gear in place of the 2.8i 4x4 running gear?

Also could i fit 2wd running gear without any mods?

Thanks in advance

Neil