AMC Turbo 400 swap into blown stroked LJ

SledgehammerLJ

New Member
Original poster
Joined
Jan 6, 2022
Messages
6
Location
Connecticut
Hi all,

I'm in the middle of an AMC Turbo 400 swap into my LJ 4.6 Golen stroker motor with supercharger. I have the trans built, have B&M shifter, Novak adaptor for Rubicon transfer case, all cables, trans mount, etc... I have a Hesco crank sensor relocation kit but reading alot of the reviews and forums people have alot of issues with misfires at 3k rpm and flashing CEL. The only things I think I'm unclear on is if I can re-drill the OE 4.0 flex plate to take the T400 converter. If we can use the OE flex plate We are also hoping to make a jig and move the speed sensor from the 42RLE to the T400 if we can locate it properly. Wanted to cut out mounting area from the 42RLE and weld it into the T400 case. I'm just concerned about sensor clearance to factory flex plate if I can use it. Also I've heard the 258 inline 6 flex plate bolts to the amc t400 converter but I think we'd lose our crank trigger on the OE flex plate. If that won't work we may have to deal with the Hesco crank pulley and hope ours works. Any input would be appreciated.

My other question is I've been told I can just unplug the 4th connector on the PCM to eliminate the TCM control which is integrated into the 05/06 ECU. Can anyone confirm? If so I'd like to find a way to cap off the ECU connector nicely. Anyone know if someone makes plugs?

Sorry for the mis mash of questions.

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I don't know anything about a speed sensor in the 42RLE...is there something in addition to the sensor in transfer case output?

Pretty sure you need a PCM from a manual, or maybe you can reflash yours, but I would expect a CEL and a bunch of codes from an unplugged connector.

I can't answer really any of your questions but giving you a bump because I'm curious and I'd like to pay forward however I can for the help i've gotten here on my own transmission swap.
 
The speedo sensor is in the transfer case. The crank position is in the bell housing of the trans. Weird design IMO.

As for the PCM. Another person said they simply unplugged it and that although it's in the same ECU case they are seperate of each other. Just want to be sure