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Tcase swap

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06 Jul 2018 18:50 #194060 by Michael-c
Tcase swap was created by Michael-c
Hi I run 215 80 15 remoulds on a stock geared, m13a, 2001 manual hardtop.

I've heard that I could swap in an auto t case to lower gears a touch.

Is this for m13a to m13a or vvt to vvt or interchangeable between the two perhaps??

Im terrible with figures so please if there's anyone in the know out there can you run me by the basics please..

Cheers in advance

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06 Jul 2018 20:07 #194063 by Lambert
Replied by Lambert on topic Tcase swap
As i understand it the only way that a transfer box out of the automatic version helps with gearing is with the push button box of the post 2005 manual cars. What you're after is either a rocklobster or mini lobster.

It's not a Jimny. It's my Jimny

Mooo said Ermintrude (black)
Boing said Zebedee (blue)

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06 Jul 2018 20:29 #194064 by Michael-c
Replied by Michael-c on topic Tcase swap
Been having a look at a few things since I posted and your right mate.
What about a 410 box?

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06 Jul 2018 20:33 #194067 by Lambert
Replied by Lambert on topic Tcase swap
That's the mini lobster.

It's not a Jimny. It's my Jimny

Mooo said Ermintrude (black)
Boing said Zebedee (blue)

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07 Jul 2018 06:37 #194077 by Riccy
Replied by Riccy on topic Tcase swap
The 410 box (mini lobster) is 1.5 in high box and 2.5 in low

The ratios for jimnys are in a table in the wiki here: bigjimny.com/mediawiki/index.php?title=Differential_information

Use a website like grimjeeper to calculate the differences from the current setup to the desired to see what happens.

I think a mini lobster may be too much reduction for motorway use on 28.5" tyres ( tiresize.com/tyre-size-calculator/ ). If you have no need for anything over 60mph then should be ideal. I run 31" with the same 1.5 high box and its about right (is have a rocklobster which is 4.3 in low however)

410 box would also require the intermediate prop and an SJ front prop to use for the rear. Also would need a mounting cradle to fit the jimny.

Its worth contacting the god of gearing Richard Wattam (Rockwatt engineering) to see what he could do for you. Facebook is the easiest way to get him.

Another way to look at it is to start swapping the diffs for other ratios, not hard to do and probably cheaper than messing about with the transfer box. Good time to fit a locker as well ;-)

J999 MNY, M16 VVT, R7me gbox & Rocklobster,
31x10.5r15 Cooper STT, 2x ARB Lockd' 3.9 diffs & twin compressor,
6.5" total lift, Zookbob HD steering shock, Ignis recaro's
Custom bar & arches, rocksliders & guards,
Snorkel, K&N, 13500lb Winchmax, Buzzweld, etc, etc

Plus ULYSSES (06' trayback project)
The following user(s) said Thank You: Lambert

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