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Joined: Tue Aug 7th, 2018
Location: South Dakota USA
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Not shifting into low range is a conversion issue, I found at least one other person on the internet with a similar conversion that cannot get low range.
The system is not happy about shifting into low for some reason, we can figure out why by sorting out the wiring differences between the ranger t case and the 4406. The 5.0L never had any sort of shift on the fly 4wd, or inputs from the t case, speed sensor or brake circuits as the AWD was purely mechanical and full time.
It is likely a signal on one wire that needs to be fed to make the Gem or 4x4 control module happy, before it will command the low range shift.
First I would find out why its running poorly??
firing order correct?
Fuel PSI good?
scan for codes?
Do you have a link to this discussion so I can read through it? I think that the poor idle may be due to running open cats
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2000 Ford Ranger XLT 4x4
3" Performance Accessories Body Lift
4" Superlift Suspension Lift
Fox Racing Coilovers, Eibach Springs
Camburg Heim Inner Tie Rods
FR36S Leaf Springs
4.56 Yukon Gears
Much More