Won't Shift into 4WD unless <15mph - Dodge Cummins Diesel Forum
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post #1 of 4 (permalink) Old 01-31-2020, 07:22 PM Thread Starter
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Question Won't Shift into 4WD unless <15mph

Hi folks,
Until this year, I've been able to shift into 4wd high on my rig (2007 5.9, electronic tc, 273 I believe) at pretty much any speed needed. This winter I couldn't get into 4wd (blinking light) until I slowed way down, to 10-15mph, then it would engage. It wouldn't unload/get out of 4wd and back into 2wd until slowing back down again either to the 10-15mph range. I just replaced the shift motor on the transfer case thinking perhaps it was weak, but still no go. No codes show up either. When it shifts, it's nice and smooth, no noise during or while driving. New tires, balanced and worn fine with less than 10K miles on them. Any thoughts?


'07 Mega, 3" DOR lift, Synergy steering, Carli track bar, 37x13.5 Nittos, 5x30" FTE, 4.30 Nitros/e-locker, Throttle-Up fuel filtration, BBI Stage 1 injectors, DSoT driveshaft, DynaLoc hubs, money pit, tuned by Les Szmidt (Silver Bullet).
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post #2 of 4 (permalink) Old 02-03-2020, 07:32 AM
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With my Dynatracs I found needed to run 4wd once and awhile to keep T-case functioning properly.
Something to do with hub wearing into shaft in 2wd.
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post #3 of 4 (permalink) Old 02-03-2020, 08:05 AM
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Tires possibly mis matched .

They need to be very close in size, wear diameter for smooth transfer
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post #4 of 4 (permalink) Old 02-15-2020, 01:32 PM Thread Starter
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As an update, had some random ABS light up, pulled codes and replaced both front wheel ABS sensors, and left front ABS sensor reports about a 10% increased rpm/rotation difference compared to right front and rear ABS sensors. Will lift truck next and measure circumference of all tires to check for differences.
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'07 Mega, 3" DOR lift, Synergy steering, Carli track bar, 37x13.5 Nittos, 5x30" FTE, 4.30 Nitros/e-locker, Throttle-Up fuel filtration, BBI Stage 1 injectors, DSoT driveshaft, DynaLoc hubs, money pit, tuned by Les Szmidt (Silver Bullet).
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