2006 Lj I-6 And Auto Tranny Into My '87 Mj?

[Dougster123]

Will a I-6 and auto tranny from a 2006 LJ work in my '87 MJ?

 

I'm told there might be some electronic concerns that would make it a pain.

 

Have any of you performed this swap?

 

 

Thanks,

Doug

[87Warrior]

You would need the entire wire harness + PCM from the donor. The 42RLE is controlled via the PCM not a separate TCU like the AW4.

 

I would not waste my time with a 05/06 4.0 with the troublesome camshaft position sensor. The 05/06 4.0 has already made its mark in history as being the least reliable 4.0 every produced.

[Dougster123]

Can sensor or crank sensor?

[Dougster123]

Engine + trany is less then 48k miles, I have driven it and know it's been trouble free so far. Others are suggesting the Chev V8 swap cause weight is the same with better mpg. Hmmm

[87Warrior]

Oil Pump Drive Gear Assembly, OPDGA, which is part of the camshaft sensor that replaced the dizzy. 05/06 are known to fail taking out the cam requiring a rebuild, and they are year specific.

 

I love the 4.0. If I was in your shoes I would go for a '04 or older motor or a 5.3, if that is your cup of tea.

[Alexia]

The 42RLE is an absolutely horrible transmission that was never designed for a heavy Jeep in the first place. It might be fine in a lighter Comanche. I already killed one 42RLE and having to manually shift an automatic transmission to get it to work reasonably well on hills is just a bad design flaw. That transmission can make a love for one's Jeep turn into a life long depression that can only be cured by a big stroker engine and a proper AW4 transmission.