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Lower Lowrange using stock gears

So with the gears on the manual shift case out I did some teeth counting and compared low range ratios.

Standard Transfer on a BJ42:
Input: 32,
Hi speed side of idler:43,
low speed side of idler: 26,
hi output gear: 32,
low output gear: 38
(43/32)X(38/26)
1.34375×1.461538 = 1.96

Low range ratio of 1.96

HJ61 Transfer:
Input: 32,
Hi speed side of idler:43,
low speed side of idler: 24,
hi output gear: 32,
low output gear: 41.
(43/32)x(41/24)
1.34375×1.708333333333333 = 2.295

Low range ratio of 2.295

Which translate to Crawl ratio of :

4.9 (H55F 1st) X 1.9 (low range) X 4.11 (diff gear) = 38.26 crawl BJ42 5 spd NA spec
4.9 (H55F 1st) X 2.29 (low range) X 4.11 (diff gear) = 46.11 crawl HJ60 Auto Transfer gears

And if I get the 4.56 diff gears I’m planning on down the line..
4.9 (H55F 1st) X 2.29 (low range) X 4.56 (diff gear) = 51.16 crawl HJ60 Auto Transfer gears + 4.56 diffs.

Not quite the same as proper crawler gears but at least its better than stock with the 34″ tyres.

Some photos of the modification

20110216_003.jpg
20110217_001.jpg
20110217_005.jpg

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