Thread: Ideal LT230 for 4bd1T?

Thanks to the short bell housing, you should have enough room for an adapter between the Isuzu 5 speed and LT230, without pushing the LT230 back.

If that's the case I might push the whole lot back a little for more room up front,of course that depends on the adapters thickness.Then the air filter probably won't fit behind the engine if I do that
I will just have to try it and see what can be done.

The 1.003 ratio was standard with the 4BD1 and LT85.

Originally Posted by Brian Hjelm

The 1.003 ratio was standard with the 4BD1 and LT85.

That is apparently true, BUT mine was an ex 1988 110 and had a 1.2:1 High range and LT85.

JC

I got a LT85 from a V8 & bought a set of gears that I ws told was standard for this set up. I dont know the ratio but it is way too high. Third gear (no tacho) runs to 100km/h, 1st gear is a pain to start with a bit of load or uphill.
When I work out my ratio I will change it.
Can this be done without pulling the box/tc out?

Probably of interest to those who have an LT230 with 1.003:1 high:
I have one of these. Was after a 1.2 box which would be better for my purposes than 1.4 in a Defender. It was pulled out of a Discovery but serial no indicated it came from an earlier Rangie with 3 speed Torque Flite auto.

Did some looking thinking and measuring. Then got a new input gear cut that drives directly onto the high range gear of the cluster, similar to the layout of Series Transfer boxes. 22 teeth to 44 instead of the standard 26 tooth input to 41 tooth middle gear on cluster. Overall ratios 1.27:1 high and 4.21:1 in low. ie Nearly as fast as Discovery high range and nearly as slow as Maxidrive 30% reduction in low. Cost of gear design, cutting and hardening a bit less than Maxidrive low gear set. Did not include teeth for PTO dog clutch on it. This would have added the order of $200 for something that very few people use. Holes to allow oil to lubricate the spline were included. The original gear did not have any. Probably it and the short input shaft from the Torque flite had been replaced as silastic on gasket faces indicated box had been taken apart since original assembly and splines are in perfect condition.

With my present priorities, will probably be 3 months before I get around to assembling box and installing it. Intend to post some photos then.

Mick

Originally Posted by justinc

That is apparently true, BUT mine was an ex 1988 110 and had a 1.2:1 High range and LT85.

JC

What vehicles used the 1.2? Yours may well have been changed out.

Originally Posted by Albert

I got a LT85 from a V8 & bought a set of gears that I ws told was standard for this set up. I dont know the ratio but it is way too high. Third gear (no tacho) runs to 100km/h, 1st gear is a pain to start with a bit of load or uphill.
When I work out my ratio I will change it.
Can this be done without pulling the box/tc out?

Hi Albert,
Yes you can change out the gears without removing the transfer case. Pull the intermediate shaft and change the high range gear on it and then remove the centre diff assembly and change out the high range (small gear) on it and reassemble. An afternoons stroll in the park........Brian