Just wondering if someone here might be able to help with a quick question, I have recently purchased a Perkins 4 cylinder diesel model 4.108 (50hp) that originally came out of a late 70's ford f-100 pickup truck. It has a ford bellhousing with a ford 4 speed with no reverse. I plan on doing a swap with this unit and adapting it to a different type of trans, however after a better inspection of the trans/bellhousing, starter/flywheel setup, i will need to change out the fly wheel in order to adapt a different starter and transmission. So here is the question, it appears that the flywheel is probably two-3 inches thick which is much thicker than one you'd find off a v8 gasoline powered engine, can i use a different weight/lighter type flywheel or do i need one equal in weight and do diesel flywheels in general act like crankshaft balancer???? There is no harmonic balancer on the front of this engine. Any info would be helpful...