I looked at going SM420 years ago. Even had one and old adapter (thicker) that equalled the stock length of the H42 setup. Back then thought some made an adapter that allowed the stock transfer shifter to work. I'm debating putting an H41 in my 68 FJ40. Have both sixteen and nineteen spline...
Is this on a 78 FJ40? Which direction does the high low lever on the transfer case point. Stock it would point forward. Not 100% sure but believe with a twin stick that lever needs to point to the side. For me just removing the shift gate that prevents 2WD low range does the same thing as a twin...
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