not talking about the trans tunnel. i cut down a long bed frame to 115 wb. then put the eng/trans in and tried to put the 30 gal tank in. it hit the trans crossmember. using an early frame, i had to move the eng/trans a little farther back because of the overdrive trans. it is approx 4 in longer than reg 727. if i would have used a 20 gallon tank, i would have been ok. i just wanted a bigger tank.