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Re:Re:JB74 tcase gears

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06 Jul 2020 12:28 #224583 by volpin
JB74 tcase gears was created by volpin
hi to all, i'm looking for informations about gears compatibility for JB74 tcase. Do 3rd gen push-botton tcase gears are compatible with JB74 tcase?
i want a reduction gear set for my JB74 but i can't find infos or anything to buy.

thanks for the help

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06 Jul 2020 23:45 #224615 by crash486
Replied by crash486 on topic Re:JB74 tcase gears
I've heard that these fit the jb74 but not seen anyone fit them as yet.
protrack.gr/en/gears/jimny-vvt-ddis-reduction-gears

crash486

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07 Jul 2020 05:20 - 07 Jul 2020 05:56 #224618 by mlines
Replied by mlines on topic Re:Re:JB74 tcase gears

crash486 wrote: I've heard that these fit the jb74 but not seen anyone fit them as yet.
protrack.gr/en/gears/jimny-vvt-ddis-reduction-gears

crash486

I would be careful. The JB74 changed back to a manual system, the VVT was electronic. I am not saying they don't fit, just be aware of the change. Looking at the part numbers between the standard VVT box and a JB74 box, the majority of the gears/shafts are identical. A couple of the parts (e.g input shaft) have a single final digit change (e.g 0 to 1) which in my experience is a minor revision change that can just be a different supplier.

The parts that "connect" the electronic actuator to the "gears" are the clutch sleeves, these appear to be the same. So it does look on paper to be probably compatible if the minor part number revisions are just minor, not consequential, changes.

As a cross refer to the Suzuki parts list, looks like in that kit you get:

Suzuki Part 5 - identical between VVT and JB74
Suzuki Part 10 - 29232-76J11 becomes 29232-76J12
Suzuki Part 4 - identical
Suzuki Part 7 - 29111-84A00 becomes 29111-84A01
Suzuki Part 18 - Speedo drive - varies (probably due to different final drive ratio and tyres.


Sent from my moto g(7) plus using Tapatalk

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Last edit: 07 Jul 2020 05:56 by mlines.

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07 Jul 2020 06:07 - 07 Jul 2020 06:08 #224622 by yakuza
Replied by yakuza on topic Re:Re:JB74 tcase gears
I have assumed that the transfer case shifter in the JB74 is a more or less direct replacement of the actuator on the VVT Jimny. The shift pattern is not like the earlier shift lever transfer cases so the new handle imitates the push button actuator so to say.
And Suzuki tends not to re-invent everything on a new model.

But then again assumption is the mother of all #¤%!-ups..

2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
Last edit: 07 Jul 2020 06:08 by yakuza.

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07 Jul 2020 09:53 #224628 by saxj
Replied by saxj on topic Re:Re:JB74 tcase gears

mlines wrote:

crash486 wrote: I've heard that these fit the jb74 but not seen anyone fit them as yet.
protrack.gr/en/gears/jimny-vvt-ddis-reduction-gears

crash486

I would be careful. The JB74 changed back to a manual system, the VVT was electronic. I am not saying they don't fit, just be aware of the change. Looking at the part numbers between the standard VVT box and a JB74 box, the majority of the gears/shafts are identical. A couple of the parts (e.g input shaft) have a single final digit change (e.g 0 to 1) which in my experience is a minor revision change that can just be a different supplier.

The parts that "connect" the electronic actuator to the "gears" are the clutch sleeves, these appear to be the same. So it does look on paper to be probably compatible if the minor part number revisions are just minor, not consequential, changes.

As a cross refer to the Suzuki parts list, looks like in that kit you get:

Suzuki Part 5 - identical between VVT and JB74
Suzuki Part 10 - 29232-76J11 becomes 29232-76J12
Suzuki Part 4 - identical
Suzuki Part 7 - 29111-84A00 becomes 29111-84A01
Suzuki Part 18 - Speedo drive - varies (probably due to different final drive ratio and tyres.


Sent from my moto g(7) plus using Tapatalk


Martin, have you been able to confirm what the actual final drive ratios are? What has been published doesn't make any sense.

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09 Jul 2020 21:47 #224737 by volpin
Replied by volpin on topic JB74 tcase gears
I can't understand why any of big company don't try or test prev gen gears set to fit on new tcase....worldwide nobody try to install a gears set onto jb74?! I can't believe it. I know some (i'm one of them) change diff gear ratio, 4.56 4.88 5.38.....a big change in hi range gear but nobody make or try something for low range.

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10 Jul 2020 10:30 #224754 by saxj
Replied by saxj on topic JB74 tcase gears

volpin wrote: I can't understand why any of big company don't try or test prev gen gears set to fit on new tcase....worldwide nobody try to install a gears set onto jb74?! I can't believe it. I know some (i'm one of them) change diff gear ratio, 4.56 4.88 5.38.....a big change in hi range gear but nobody make or try something for low range.


Have you changed the diff gearing on a Gen4? If so what was the ratio of the original, and was it a manual or auto?

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10 Jul 2020 16:09 #224778 by volpin
Replied by volpin on topic JB74 tcase gears
Mine is manual, original was 4.09, i change to 4.56 and i run 31s

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16 Jul 2020 10:34 #225156 by saxj
Replied by saxj on topic JB74 tcase gears

volpin wrote: Mine is manual, original was 4.09, i change to 4.56 and i run 31s


The 4.09, is that from the documentation, or was it actually calculated from the gears.

What has been published as the final drive doesn't make sense to me, because all the other ratios (gearbox/transmission and transfer) remain exactly the same for both manual and auto, as the gen3.

If it was true, the manual would be labouring along, while the auto would be screaming.

I had someone accidentally put 4.09 in my gen3 manual, it wasn't a great drive with bigger tyres.

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16 Jul 2020 13:58 - 16 Jul 2020 14:04 #225168 by mlines
Replied by mlines on topic Re:JB74 tcase gears
Standard ratios for the JB74 are

4.090 manual

4.300 auto

FYI

The other ratios are ( Manual first, Auto second)

1st 4.425 2.875
2nd 2.304 1.588
3rd 1.674 1.000
4th 1.190 0.696
5th 1.000

Transfer 5.151 2.300

Sent from my Pixel 2 XL using Tapatalk

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Last edit: 16 Jul 2020 14:04 by mlines.

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16 Jul 2020 14:29 #225169 by saxj
Replied by saxj on topic Re:JB74 tcase gears

mlines wrote:
Transfer 5.151 2.300


????

According to the global suzuki site transfer is 1.000 and 2.002 for manual and 1.320 and 2.644 for the auto

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16 Jul 2020 14:30 #225170 by saxj
Replied by saxj on topic Re:JB74 tcase gears

mlines wrote: Standard ratios for the JB74 are

4.090 manual

4.300 auto


Which is completely opposite of the Gen 3.

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