Outer Limits 4x4 Board

Hey thought I would post um as I'm being lazy and wasn't really getting anywhere with searches...

Got a Jimny 1.3 motor but comes with a Auto, not too keen on using the auto but would like to install the motor and replace my carbied 1.3 motor. I have basically a whole Jimny so wiring shouldnt be a problem.

So can I bolt up this motor to my old gearbox and use the fly wheel, or would I need to find a Jimny 5speed to go in then just modify the drive shaft to the transfer..? This sounds the easiest but I dont have a gearbox at this stage, obviously things such as new exhaust and other mods may come into play that I am aware of so anyone being able to shed some light on this would be cool or previous links or sites.

Stat right off so any thoughts on ditching the old body and going coily are allready out the window...

is that one from a pickles auction? what did you pay for it?

i have a jimny efi SOHC in mine, which bolts up to the gear box, but from my understanding the DOHC (m13a) do not, so you would have to find someone with a 5spead.

You will need to buy a jimny 5sp as the m13a is different from the g13bb which bolts up to the sierra box.

Left hand engine mount will bolt straight up but you will have to mod the right hand engine mount. The radiator from the sierra is fine.

You can also modify the jimny jackshaft to drive to the transfer case...

You will need an efi tank.....The vitare tanks suit unless you have space for the jimny mid mount tank.....

i wonder how much work would be involved with a m13a gearbox in a sierra as the gearshifter runs off an extention housing on the jmny and sits above the output shaft on the gearbox

go the auto

X2- go the auto.

The manual shifter will sit over the transfer shifter. The whole car will drive better offroad with the auto anyway, and as you already own it, just put it in. It will be much easier to fit.

There's no sierra pattern gearbox in the M bolt pattern.

The auto is very small but with a good cooler it will be fine - Greg's car runs the same auto with a G13BB jimny - I haven't seen the auto temp gauge over 105deg, and that was on the highway. offroad it doesn't get this high. just run a gauge and make sure your gearing is right.

Steve.

X2- go the auto.

The manual shifter will sit over the transfer shifter. The whole car will drive better offroad with the auto anyway, and as you already own it, just put it in. It will be much easier to fit.

There's no sierra pattern gearbox in the M bolt pattern.

The auto is very small but with a good cooler it will be fine - Greg's car runs the same auto with a G13BB jimny - I haven't seen the auto temp gauge over 105deg, and that was on the highway. offroad it doesn't get this high. just run a gauge and make sure your gearing is right.

Steve.

Fatzook on here did the M13a conversion with manual into his sierra a while back and said it was a complete nightmare of a conversion. I reckon find a G13bb but that's just me.

I think the the 5spd gearbox for the Jimny with the M motors is a totally different gear ratio range. 5th gear is 1:1, and they are lower before that.

I love this idea as you dont have an overdrive and hence less losses in 5th gear, however it may muck with your cars overall gears if it is already well set up.

I'll put up the ratios:

Sierra WT('91 on) & Coily, + Early Jimny:
3.652:1
1.947:1
1.423:1
1.000:1
0.864:1
3.466:1 (R)

Later model Jimny:
4.425:1
2.304:1
1.674:1
1.190:1
1.000:1
5.151:1 (R)

They could do this because the newer Jimny transfer is higher ratiod, and hence the overall difference was very little. They only difference between the mentioned model 5spd for sierra and earlier models is 5th I think.

M13a 5speed is the same ratios as the G13 5spd.

The gearbox shifter sits further back (I forget the exact measurement but essentially if you were to relocate the hole in the transmission tunnel to immediately infront of where the transfer shifter is) best to put some bends into the shifters so that they clear eachother easily.

The Sierra jackshaft fits between the Jimny box and the Sierra transfer.

Mount at the rear of the gear box misses by about 50mm needs a little bit of fab work.

If you run with an engine mounted fan it will sit pretty close to the standard Sierra radiator (ie 10mm) I have gone electric fan.

As stated before wiring is PITA (but then any modern engine into old vehicle would be)

You need VSS as Sierra speedo does not have it.

I needed to get a Jimny clutch cable as the end of the Sierra did not mate to the arm of the fork on the Jimny box.

Yes new exhaust (or at least part) will be required as o2 sensors are now required and the Jimny extractors were shorter than my Sierra ones.

You can modify the handbrake drum and use the jimny vss unit.....

If you use the jimny cluster you will also have tacho as sierra tacho will not work with m13a or g13bb.

Extractors for the m13a or very $$$$ and the standard engine pipe and cat fit without mods.....

Fitting is easy wiring is not........be careful some of the plugs under the dash are the same and you can mix them up....I did...

You will need to run thermo as suggested.....

You can also bolt the power steering straight in as as the mounts are identical.....

If you have the auto, stick with the auto.

You will be creating a lot more work for yourself by changing, the wiring and ECU etc are already set for the auto.

I have considered using the Auto and thought of how much easyier crawling would be...? Im currently running 31"s and ser3 rockhopper gears in the transfer so I wonder how well it would go..? Would I lose that down hill control I have currently with gearing in 1st. So running a cooler for the auto is recommend if I go this option

I did forget to mention or worded it wrongly in that my Sierra is a NT with current WT running gear, so mounts have been changed, as well as the mount for the gear box being able to slided on the chassis if needed to mount up correctly. The engine is now accessibly and the only damage to it seems to be the pulley on the power steering, when the radiator hit it.