Manual Gearbox -4JB1 - 4JG2

[username]

HI

Would be good to clear this up and maybe make it a sticky - I may end up buying both to find out if they bolt up or not -

Has anyone tried putting a gearbox from a 2.8 [4jb1] onto a 3.1 [4gj2]?

I am wanting to go from an auto 3.1 mu to a 3.1 manual RN106 HiLux.

I have just bought a box - shafts off a 2.8, but havent taken the engine out of the mu.

Cheers for any help advice or photos.

[MattMu]

I did the opposite... bolted a 3.1 to a 2.8 gearbox....identical. Although the 3.1 flywheel is 10 mm larger in diameter, but the splines, studs and bolts are identical.

[jezza]

They both bolt up, the 3.1 manual gearbox is better because it has a flange on the output shaft instead of a slip yoke which makes modifing for other makes of driveshafts piss easy. My mate did a manual conversion on his 92 2.8 mu and he used a 3.1 gearbox from a 96 mu.
Here is the my 3.1 gearbox

[username]

thanks for the quick replies

whiuch leads me to the next question, are the cranks the same or do they have the same stud pattern - flywheels interchangeable etc?

I have a gearbox/driveshaft clutch line, an box has flange on output so by posted info 3.1 and a mint 3.1 engnie in my mu stil running,

Just need flywheel clutch pressure plate and im away.

anyone have one for spare or for sale in wellington 0276967752
Cheers

mike

[geeves]

keep an eye on pickapart. Lots of Mus/bighorns go through there

[username]

its isuzu less at moment - am up there once a fortnight sometimes more, live a few minutes from it. paradise..........Not

I bought a 2dr 3.1 manual bighorn a few weeks ago which I may end up using for conversion in the mean time

[MattMu]

Yes the cranks are the same.
Use the 3.1 clutch and flywheel....bigger and more clamping pressure with no noticable pedal pressure increase.

[username]

HI

Would be good to clear this up and maybe make it a sticky - I may end up buying both to find out if they bolt up or not -

Has anyone tried putting a gearbox from a 2.8 [4jb1] onto a 3.1 [4gj2]?

I am wanting to go from an auto 3.1 mu to a 3.1 manual RN106 HiLux.

I have just bought a box - shafts off a 2.8, but havent taken the engine out of the mu.

Cheers for any help advice or photos.

I ended up buying both boxes 2.8 and 3.1 and they were identical in bellhousing position to engine, adapter plates the same, even same as the auto 3.1.
I went with the 3.1 flywheel clutch pplate and starter.

Have took a whole bunch of photos of the project to date and will make a thread about it one day but its far fropm, finished - no lockers / on boiard air - cb radio yet.

[geeves]

sounds like a monster in the makeing

[slightlydodgy]

Is the hilux RN106 box the same as a zu box with a removable bellhousing?

[Yarno]

Is the hilux RN106 box the same as a zu box with a removable bellhousing?

Yep the Hilux auto will have a removable bell and unlike the Isuzu, the manual also has a removable bell.

[PaladinAus1]

Does the same apply with the Auto boxes? 3.1 and 2.8 are interchangeable?