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have a 22 3500 drw ho with 410 wish i would have got 373. pulling 18000 lb 5th wheel can hold 60 up a 6% grade with no problem. with 373 gears it would most likely down shift 1 more gear but still hold the speed. i wouldn't be afraid of it. in my old truck 2006 had 373 i changed to 410 there is...
ab or aa mine was doing the same thing had aa filter changed to ab filter have driven empty 200 miles and gauge only just went to 1/8 aa is white with glue strips ab is orange no glue strips
had the aa filter was doing regen every 100 miles changed to the ab filter drove 200 miles and gauge only at 1/8 runs a lot better also. 2022 ho 3500 dually 20000 miles
just went and looked gray is for aux switchs pass through harness. Didn't see the blue connector. on the older trucks the blue was for aftermarket trailer brake controler. have 2022 3500