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7. The 258 crankshaft bolts into the 4.0L block with no trouble. We used the latest 258 crank, the '87-'90 model (casting No. 3727). This is an 8-counterweight version that is compatible with serpentine belts. Earlier cranks have a longer snout and require a spacer (Hesco makes 'em) for pulley alignment. Especially important to manual transmission users, the 258 and '87-'91 4.0L cranks have a larger pilot bushing outer diameter (OD) than the '92-'06 4.0L engines. We used a bushing that had a 1.82-inch OD and 0.75-inch inner diameter (ID) found at a parts store. It fits into the larger bore at the end of the crankshaft. There are other possible dimensions depending on which trans you have, so pay attention. View Related Article
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