4.0:1 Low Range Gear Set for 1980 - 1990 Toyota FJ60 Transfer Cases Having a 19 Spline Input Shaft and a 38MM Cluster Pin.
This gear set is designed for the 38MM cluster pin case, however; we offer a stepped cluster pin that works for the 34MM case and uses this same gear set. The cluster pin kit for the 34MM case is PN716934A.
The 4:1 low gear set offers you some gearing options without swapping axles or drivetrain and requires no drive shaft modifications. The kit does not include bearings or new seals. We do offer a rebuild kit, PN401419.
Note: This Gear set will also alter your high range ratio. The high range ratio will now result in a 10% underdrive.
Cluster gear clearance: The large end of the cluster is 6.665" in diameter. The case needs to be clearance for this gear. The back half of the case requires modifications. Measuring from the mating surface of the rear case half, 1.30" deep and a clearance diameter of 6.685" is what needs to be clearanced for the gear. The gear interferes with the two lower bosses.
Low gear clearance: This gear requires a bit more modifications to the rear case half for gear clearance. The gear diameter needs to clear 7.353" all the way to the bottom of the case half. The modifications to the case for this gear removes material ,several of the internal bosses, and from the shift rail boss.
34MM cases must have material added to the outside areas of the case. The case must be taken to a welding shop and heliarced. The if this is not done the machine operation will break through. Advance Adapters will not weld or have this procedure done. We will machine cases that have been welded.