BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
Parkwood Nr. Leeds
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Fitting a rock lobster (SJ) transfer box in a Jimny...
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sniper
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- jackonlyjack
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Spare in mi shed
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I’ve already got the box with the speedo mount and signal gear fitted though...
And the rear prop conversion spacer...
Reading their item description though, that indicates that their kit needs an SJ intermediary prop from the gearbox to the input flange on the transfer box
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- jackonlyjack
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Dave do you know if the 80mm pcd prop end will fit onto a jimny/standard intermediary
I have 2 jimny one's and was going to have them shortened
Or do i need to buy the 85mm pcd input flange ?
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sniper wrote: I'm struggling with the same problem now, bought the box without a thought to mounting it...... Bit dumb when the mounts will cost me more than the box...
sniper
I think that’s what puts most people off... you’ve got to buy the box, get the gears fitted or welded, source a mount, and then mess about with old props...
Hence my wish to use standard Jimny props...
The intermediate prop is a pain too, it’s either get an old SJ one and hope it’s still reusable without being rebuilt, or get a Jimny one shortened to suit...
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Fit onto the SJ transfer ?
This would mean i only need the props shortened
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I’ve ordered a standard Jimny transfer box from James so that I can build a jig around it, and then take the box away and put an SJ box in it’s place and see what lines up, and then it can be used to make a bucket mount for the SJ box as I’ll have all the reference points on the jig...
Russ from JimnyBits indicated that their kit (referenced in the rear propshaft conversion spacer listing) used standard Jimny props, but I’m not sure if that also included the intermediary prop?...
Time and tinkering will tell...
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By clamping the end of an old prop to the flange (I've got 8mm and 10mm pattern ones)...
To make it take both prop holes sizes...
I think the conversion spacer for the rear will be a 10mm one?...
And this is the rocklobster box complete with early Offroad Armoury enclosed speedo mount...
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The JimnyBits rear proshaft conversion spacer...
So this side is like the end of the SJ rear shaft and bolts onto the rear output flange (from behind!)...
NOTE that it's dual fitment - 8mm and 10mm holes
And the other side -
... is shaped to take the end of a standard Jimny rear propshaft
With it bolting in place from behind the output flange, something I hadn't considered was the Offroad Armoury enclosed speedo drive gear / pickup... that black nylon shroud around where the 410 drum hand-brake used to live, so this wouldn't normally be an issue, but as my rear output flange was already loose (the previous owner had obviously kept the right and proper flanges) I pulled it off, bolted the spacer on, and then refitted the flange and spacer back on again... With a standard speedo gear on the back of the flange without a shroud around it this wouldn't be an issue...
All sorted though, and ready for a standard Jimny rear propshaft to bolt to it...
You can see my re-drilled flange there with the bolt close to the edge of the flange, but there's plenty of meat around it, and it's strongly clamped in place... I did consider using the 8mm holes, but would prefer the bigger bolts in place, and being as I'd already drilled the flange... The 8mm's smaller heads might have given me a bit more breathing space though!
I also changed the breather elbow from 6mm tube to 8mm tube as I use on my breather setup...
I didn't have my scruffs on today (Jack) so I haven't disappeared under the buggy yet to look at the standard front props...
I'll be out in the garage again tomorrow though
Meanwhile the Jimny standard transfer box is on it's way from James, and the SJ transfer box spine has also been posted to me...
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SJ (rocklobster_) transfer box : ~34cm across the flanges with the JimnyBits conversion spacer attached (allows the use of a standard rear propshaft)And...
~6cm offset from front output flange back to the input flange...
Measuring through my homemade standard Jimny transfer box cradle/skid... again ~34cm
BUT...
~13cm offset from the front output flange back to the input flange...As confirmed by Russ at JimnyBits, their kit (not on sale at the time of writing) uses standard front and rear Jimny propshafts BUT does need a SJ intermediary shaft, or a shortened Jimny intermediary shaft...
So I quickly message James and asked if he hadn't shipped the standard Jimny transfer box that I've ordered for reference measurements (and to make a mounting cradle for the rocklobster box), if he could pop an intermediary prop into the same parcel so that I can (get it) shortened...
Also the three props all look to be 10mm holed, so I might have to whip the input flange off the rocklobster box and redrill that too?...
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