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DIAGNOSIS AND TESTING - TRANSFER CASE - NV231 DIAGNOSIS CHART Condition Possible Cause Correction Transfer case difficult to shift or will 1) Vehicle speed too great to permit 1) Slow vehicle and shift into 2) If vehicle was operated for an 2) Stop vehicle and shift transfer 3) Transfer case shift cable binding. 3) Repair or replace cable as 4) Insufficient or incorrect lubricant. 4) Drain and refill transfer case with 5) Internal transfer case 5) Repair or replace components as Transfer case noisy in all drive 1) Insufficient or incorrect lubricant. 1) Drain and refill transfer case with Transfer case noisy while in, or 1) Transfer case not completely 1) Slow vehicle, shift transfer case 2) Transfer case shifter binding. 2) Repair, replace, or tighten shifter 3) Range fork damaged, inserts 3) Repair or replace components as 4) Low range gear worn or 4) Repair or replace components as Lubricant leaking from transfer case 1) Transfer case overfilled. 1) Drain lubricant to the correct 2) Transfer case vent closed or 2) Clean or replace vent as 3) Transfer case seals damaged or 3) Replace suspect seal. Abnormal tire wear. 1) Extended operation in 4Hi mode 1) Operate vehicle in 2H mode on 21 - 820 TRANSFER CASE - NV231 KJ |