Thread: Isuzu MSA Gearbox to LT230

I might be interested in the new style shifter parts, if they also fit my 6 speed box. I'm not using an LT230 so don't need adaptors or shifter for them.

Originally Posted by steveG

For me, it would definitely be keep the existing length, for the following reasons (in a 110):
- 160mm further back would give clearance issues between turbo and heater. (Standard engine position with angled truck turbo manifold is in a good position).
- repositioning engine mounts is welding and technically requires engineering approval. The average punter that can change a g'box may not be up to welding mounts, so would need to get someone to do it (cost/hassle).
- requirement for different radiator hoses, and/or mods to radiator mounting, fan shroud etc.
- Don't see any big drama with access to the PS box in standard position. 3-bolt box was a bit tighter but still OK. 4-bolt is fine.
- Requirement to relocate the air filter isn't a show stopper, but an extra task and not sure I want to look like Roothy
- I cant see a need for a six speed. With a turbo - 4 is VERY driveable, 5 would be nice to drop a few revs for cruising.

And I agree with all of Isuzurover's points.

Steve

Regarding the need for 6 speed. I had little info on gear ratios for different Isuzu boxes and when I bought mine those I had were for a later box, which had a 1st gear of about 6:1, 5th 1:1 and 6th overdrive. I thought the low 1st would be useful at times for crawling.

It turned out that the box I bought had ratios similar to the 5 speeds discussed here, but with 6th being a 2nd overdrive ratio (i.e. same spread from 1st to 5th). There can be fuel consumption advantages when cruising at low engine rpm's in 6th.

We have many variable with modified vehicles, like final drive ratios, tyre size etc. and people need to carefully consider how these interact with the gearbox ratios before spending $$$$.

In conjunction with what John said with ratios...I would have liked an mpb mbp?? 6speed that has an even lower first than the mxa but the problem being finding one at a reasonable price as they are newer and for me harder to find the mxa 1st however is what 58%?? lower than any rover box and 6%?? higher for cruising..I find that this will be convenient for me as in conjunction with running 35" tyres,4.11 diffs and standard transfer so should even out nicely hopefully but if not transfer case will be changed...I personally would never own a 4speed I would personally love a 9speed the more the merrier

Originally Posted by Bush65

I might be interested in the new style shifter parts, if they also fit my 6 speed box. I'm not using an LT230 so don't need adaptors or shifter for them.

Just so that it's noted I am also up for one shift kit it does not matter if it is the old design or new design so pencil me in...

Originally Posted by isuzurover

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The reason I asked about the short(est possible) setup, was that I think I can fit a 4BD1(T) in the IIA and keep the original grille/bonnet setup.

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Yes I believe this would be possible.

Thought your IIA was going to get a 4BJ1??

Originally Posted by Bush65

I might be interested in the new style shifter parts, if they also fit my 6 speed box. I'm not using an LT230 so don't need adaptors or shifter for them.

I notice a few differences with the top cover looking at Cheif's images.

- obviously it has a 4th rail in it for 6th gear. Would need to check the total distance between gates to make sure the LT85 selector had enough travel (MSA 5 Speed has 3 rails)

- the position of the 'original' 3 rails may not align with the first 3 of the 6 speed.

- Although the 4 main studs the mount the both boxes in trucks are the same (hence why the original shifter fits), I notice in the image that the top cover has more mounting bolts than the MSA, it is also possible much of the shift rails and forks are very different.

- also the position where you want the lever to come up would need to be determined. The hard part about with the MSA with this new set up is that the spot where the gear lever needs to come up for standard 110 position is right where the rail interlock is on the MSA - hence this section needs to be relocated to accomodate.

Basically what I am saying is, that I am sure it can be done, but most likely it will be different to the MSA one. I am also sure that once I work out the MSA one, it will be alot quicker and easier to do MXA-6R and other ones in the future....

Originally Posted by Bush65

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We have many variable with modified vehicles, like final drive ratios, tyre size etc. and people need to carefully consider how these interact with the gearbox ratios before spending $$$$.

Very true

Thanks for the replies so far. I am glad I asked the question.

It appears that the original position set up should definitely be pursued and evolved....


And any variations an option