Gearbox and Lt230 Transfer Q's - 4BD1-T

Sorry I should clarify. the existing/ stock gearbox is factory fitted to the Isuzu .

in that case it will be 1.222:1 or 1.003:1. most were the 1.003 but mine was 1.2:1. i converted to lt95 when i fitted the 4bd1 to my rrc, i have also seen a factory fitted 1.2 ratio lt230 to a 4bd1 120" 1991 model.


jc

Hey Justin when you say 1.222:1 is that 1.222 rev of the output shaft to 1 rev the input or vice versa?

I plan to increase my t/c gear ratio as atm I'm sitting at about 2800/2900 at 100km/hr which is ridiculously high, given the original was about 2300/2400 at similiar speed.

Basically is it a 1.4:1 or 1.003/0.996:1 ratio that would produce a higher ratio? (Without changing tyre sizes- running original 16R).

Also, are you or others aware of aftermarket higher gear ratios??

Cheers JP

Quote:

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Originally Posted by 110Landy86

Hey Justin when you say 1.222:1 is that 1.222 rev of the output shaft to 1 rev the input or vice versa?

I plan to increase my t/c gear ratio as atm I'm sitting at about 2800/2900 at 100km/hr which is ridiculously high, given the original was about 2300/2400 at similiar speed.

Basically is it a 1.4:1 or 1.003/0.996:1 ratio that would produce a higher ratio? (Without changing tyre sizes- running original 16R).

Also, are you or others aware of aftermarket higher gear ratios??

Cheers JP

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That is 1.222 turns of the input shaft for 1 turn of the output shaft. If you want to drop your engine revs for the same road speed then you will have to go to the 1.003 or the .996.

If you look through the 4BD1 T threads you will get opinions as to what ratio is best. Look through Justin Cooper's Isuzu related threads and I am sure he has spoken about it.