
Originally Posted by
JDNSW
As everyone has indicated, you cannot fit any overdrive on the 6x6 because it uses the same place as the overdrive to take the drive to the third axle.
For the same reason, you cannot swap to a different gearbox that uses the LT230 transfer case. Your only option is to fit three higher ratio diffs, but this brings its own problems. The other solution often suggested for higher ratios, of fitting larger tyres, is very limited because of the limited clearance between tyres on the second and third axles.
John
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