I'd check out your bushings and see if anything is bent.
Has it recently started happening?
With manual hubs you can go into 4hi at any speed, and moving is far easier
than being still.
For four low you MUST be in neutral at either a stop or s-l-o-w-l-y moving.
Pull it back into 4hi, right, and back into 4low.
If you can't get it into 4low while under the truck, or get it to stay in
4hi while adjusting it under the truck, I have an NP208 for a TH700R4 in
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