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Fitting a rock lobster (SJ) transfer box in a Jimny...

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15 Jul 2020 18:21 #225130 by Riccy

Probablynotfrank wrote:

Riccy wrote: Ive got a shortened intermediary prop for an R72 gearbox to your welcome to, but it will have the wrong spline count on the gearbox end of it. Might be possible to swap over the UJs to get it right

I'd be interested in the measurements of the shortened R72 shaft?

My R72 shaft next to an SJ wish I knew about the different splines first :silly:


I'll swap you my shortened R72 shaft for your decent looking SJ one if you fancy a 0 cost swap? (assuming UK postage costs similar to each other), send me a PM ;-)

I can measure it on friday when next in the garage otherwise...

J999 MNY, ULYSSES M18 VVT with ITB's Dyno tested at 130hp

Pickup/tipper, R7me gearbox & 4.3 Rocklobster, 31" Toyo MT, 2x ARB 3.9 diffs in braced axles, 6" total lift, Floating rear conversion, Raptor painted, CB, Recaro's, Caged, etc, etc...

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15 Jul 2020 20:17 #225135 by X8GGY
Certainly started some good conversations going! B)

Looking back at old photos again...



I can't help but think...



That the bucket / cradle mount almost wants to follow the same lines as the transfer box spine outer edge? B) ...

Wandered off for a bit... you'll find me in the garage building a Jimny Buggy ;)
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16 Jul 2020 05:29 #225145 by Lambert
Another question. Regarding the spine, does not integrating the spine with the impact protection create a situation where the transfer case becomes a stress member and is at greater risk than if you were to have it isolated from the protection?

Dreadnaught (black 2011)

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16 Jul 2020 05:44 #225146 by X8GGY
Hmmm... a good point?! I'll think about that when I'm sorting my newspapers out... ;)

Wandered off for a bit... you'll find me in the garage building a Jimny Buggy ;)

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16 Jul 2020 06:51 #225147 by zukebob

Lambert wrote: Regarding the spine, does not integrating the spine with the impact protection create a situation where the transfer case becomes a stress member and is at greater risk than if you were to have it isolated from the protection?


Yes

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16 Jul 2020 08:13 #225148 by X8GGY

zukebob wrote: Yes


A good comprehensive and well reasoned answer Zukebob! :woohoo:

Wandered off for a bit... you'll find me in the garage building a Jimny Buggy ;)
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16 Jul 2020 08:23 #225149 by zukebob
It was such a well thought out and presented question that I didn't want to distract from it. :)

I started out with nothing & still have most of it left
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16 Jul 2020 08:29 #225150 by X8GGY
Yes, Lambert makes a good point :)

I’m thinking brackets linked to the spine (which protects the transfer box from stresses) and a skid plate under it but not integral to it then?

Wandered off for a bit... you'll find me in the garage building a Jimny Buggy ;)
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16 Jul 2020 08:52 #225152 by zukebob
A separate skid plate would be best but only if you can dedicate enough room to have a sufficient gap between it and the transfer cradle. It shouldn't require too much space unless you really let the beast out when you drive. You could just provide enough to help ensure that any deflection doesn't still cause impact to the cradle. You know more about the ground clearance to an SJ transfer than I do so it would really go back to your opinion on space.

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16 Jul 2020 08:57 #225153 by zukebob
If you don't think having a skid plate below your mount is a good idea, I think you can make a couple of simple additions to your cradle that should help.

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16 Jul 2020 13:17 #225162 by Lambert
Sorry if I planted a monkey wrench in your plans Dave. It's the reason I was so keen to get the separate belly plate for Dreadnought even with the steel case brackets. Now it going to be a significant day ending impact that does for my transfer rather than just a bit of a smack on a stone.

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17 Jul 2020 00:48 - 17 Jul 2020 00:52 #225197 by yakuza
Several competition SJ413 based cars in the Norwegian trial series have a braced and cradled SJ transfer box. Design like the ring that hooks into the bolts and Welded to a cradle connecting the mountings.
Some cars got 200hp volvo turbo engine, and 35" tyres and toyota axles.
Very few has had torque related problems as far as I know. The cars get bashed and crushed of course until something breaks and it all does, but still the 4.16:1 case remain in use for many.

2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
Last edit: 17 Jul 2020 00:52 by yakuza.
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