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Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Jack?

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Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Jack?

Postby John51Balcolyn » Wed Apr 18, 2012 8:58 pm

My 2001 Jackaroo has died with the usual oil well in the sump and won't start now. While it was still actually starting the clutch quit - will not drive. I am looking at a 4JB1T to replace the dreadful 4JX1T and and am offered a complete 1991 Mu.
Does anyone know if I can instal the engine/gearbox in place of the originals without a lot of modification?
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Re: Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Ja

Postby geeves » Thu Apr 19, 2012 5:25 pm

As far as Im aware it should bolt up but there will be less hassel if you change engine/ gearbox as one. Are they both manual?
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Ja

Postby John51Balcolyn » Sun Apr 29, 2012 7:04 pm

Yes they are both manuals, but the Mu gearbox has done more work and seems to have some noises - ? new races needed. So would the "hassels" you mention outweigh the advantage of using the Jackaroo's younger gearbox?
Please also comment on my question regarding clutch slaves.
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Re: Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Ja

Postby geeves » Mon Apr 30, 2012 3:44 pm

Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Ja

Postby jackdriver » Mon Apr 30, 2012 9:55 pm

Mine was a lemon too. I did the coversion from 4JX1 to 4JB1 last year and documented it. Let me know if you'd like a copy.
I successfully kept my Jackaroo box. It had less wear than the MU box that came with the 4JB1, same as your case.
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Re: Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Ja

Postby John51Balcolyn » Tue May 01, 2012 7:43 am

Yes please jackdriver! Any clues I can get will be a great help. How can you send it?
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Re: Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Ja

Postby judex » Wed Mar 08, 2017 11:26 pm

hi every one I have just finished my 4jbit conversion on my 2001 manual jack I must say all went well and thanks to jackdriver and others ,it was an easy conversion . every things works apart from the tacho as I have not tackle it yet my 4jb1 injector pump has a two tacho senses wires so I may be able to connect later , as I am just happy all is running well I also have a very good oil pressure and the 4jb1 starts easily without the warmer system connected to the pump , I just wanted to share this experience with others whom may be interested in the conversion , thanks judex
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Re: Will 4JB1T engine and gearbox from 1991 Mu fit a 2001 Ja

Postby zacco » Tue Mar 21, 2017 7:58 am

In this process atm. 92 jack about to get a 4jbt1 from a 94 rodeo.Had a thirsty v6 in the jack. Must be a lot of good jacks around with blown motors that would be ripe for this transplant !
1989 2wd rodeo4ze1 soon to be 2.8 T/d auto,manual whatever
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1991 rodeo d/cab 4ZE1 auto , the horror , the horror !


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