well it all depends what you need it for

good fiddy engines:

300 I6
302
351w
460

my favorite tranny in 150's is the C6

my 250 has a 351w, c6, and 10.25 sterling rear w/ heavy duty axles and im pretty sure i could tear down a house with the torque this thing makes.

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Dave K
2011 Ford Ranger 4x4 Sport 4.0L "Dixie"
Rancho Suspension/Auto/3.73's/Pinstriped/Flowmaster SS Exhaust.

FUTURE: 3' Body Lift/32's/Windshield Visor/Brush Guard.