Build BJ70-MR Conversion to a PZJ70-MRS

[OGBeno]

Good deal on the long splined input gear for Splitcase. Had those on my 70 and now on my 42 and love them. Best investment for a truck that will be off-road.

Is that long splined input gear spec’d to match the 10% underdrive high gear ratio that the 4:1 kit will provide also?

Hope to see you on Rubicon, too, if I can make it out there this year.

Good to see you wrenching again.

-Alberto

Yes on the input gear.

 

[cruiserdan]

Bikes

Let me investigate.

Since when did you start asking for permission?

Asking for a friend...

 

[bj70bc]

No turbo on these IDIs for me, thank you very much.

I'll enjoy secondary roads and enjoy the scenery.

funny thing is a turbo doesnt change that anyways...

 

[OGBeno]

funny thing is a turbo doesnt change that anyways...

I’m aware.

 

[cruiserdan]

If you want a fast 7x, use a direct injected turbo 13BT, 12HT, 1HDT, or 1VDFTE.
Outside the box, a GM LS would be quite satisfying. Especially for the intoxicating V8 exhaust note.

 

[joekatana]

Today I disassembled a new split case to send the case halves to Georg @orangefj45 to have him machine the case for the 4:1 gearset.

Having the extra crawl ratio and the RR Eaton e-locker in the rear will make the Rubicon a breeze along with sliders, front and rear bumpers and a big belly skid plate.



This is the manual split case not the vacuum actuated unit:

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New speedo housing and gear:

View attachment 4075230

New 10mm Allen head drain and fill plugs:

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Center case portion:

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Beefcity gears:

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Long spline input shaft to get rid of complexity:

View attachment 4075234

New output flanges:

View attachment 4075237

When I was prepping my KZJ73 for the Rubicon I unfortunately ran out of time and couldn't install my 4;1 gears in the tcase . The KZJ did great in the rubicon but those gears would have made a world of difference . I had them in my HZJ73 crawler also and loved them .

 

[OGBeno]

When I was prepping my KZJ73 for the Rubicon I unfortunately ran out of time and couldn't install my 4;1 gears in the tcase . The KZJ did great in the rubicon but those gears would have made a world of difference . I had them in my HZJ73 crawler also and loved them .

Gave myself a 4 month buffer, Joe.

 

[joekatana]

Gave myself a 4 month buffer, Joe.

I did about the same but then life got in the way and I ended up only having 4 days

 

[OGBeno]

I did about the same but then life got in the way and I ended up only having 4 days

Oh yeah! Know that all too well!

 

[bottombracket]

@cruiserdan I would add a 15BFT to the mix in the 'fast 70 series' category, especially as it is bolt in to the 3B platform. But that is outside the scope of this project.

 

[LDowney]

@cruiserdan I would add a 15BFT to the mix in the 'fast 70 series' category, especially as it is bolt in to the 3B platform. But that is outside the scope of this project.

Are you looking over my shoulder...? I ask because I am trying to write up an overview of shoe horning a 15B-FT into my BJ70.
I concur with you. I feel like my BJ70 really scoots along with the 15B-FT

 

[bj70bc]

Are you looking over my shoulder...? I ask because I am trying to write up an overview of shoe horning a 15B-FT into my BJ70.
I concur with you. I feel like my BJ70 really scoots along with the 15B-FT

im interested

 

[bottombracket]

Politely, let's focus on @OGBeno's build here. We can talk for days about 15BFTs elsewhere.

I wanna see five cylinders of fury in his 70 engine bay.

 

[OGBeno]

Yeah. I don’t care about direct injection 5B engines!

 

[bottombracket]

With 4.1L of displacement in 4 cylinders and a bottom end so big it’ll make you swoon?

 

[Dirty Koala]

@cruiserdan I would add a 15BFT to the mix in the 'fast 70 series' category, especially as it is bolt in to the 3B platform. But that is outside the scope of this project.

Or fast 40!

 

[OGBeno]

With 4.1L of displacement in 4 cylinders and a bottom end so big it’ll make you swoon?

This shït don’t make me swoon anymore.

 

[bj70bc]

With 4.1L of displacement in 4 cylinders and a bottom end so big it’ll make you swoon?

hey... stop it

 

[OGBeno]

4:1 gear set arrived from Georg.

Some differences:

They going to be noisy mofos…

 

[svsisu]

4:1 gear set arrived from Georg.

View attachment 4075898

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Some differences:

View attachment 4075901View attachment 4075902View attachment 4075903

They going to be noisy mofos…

Nice to know what they look like inside. Compared to everything else, I don't think they are that noisy in my truck. Only at a particular speed and RPM do I think, is this the noise everyone talks about. Too many other competing noise makers in my troopy...

Great to see you putting this to the front of your endeavors.