Reverse Light blinks on and off while driving

Bad earth, check for loose wire, might also be dirty due to exposure to water etc.
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Just to confirm, you don't have an electrical 4WD selector; you have to move a shifter on the floor of our cab? If that's the case, I'd suspect that you have a linkage misalignment or malfunction that doesn't allow the 4WD selector to completely return to the 2WD position. Putting the truck into reverse and back to drive probably causes a jolt to the 4WD linkage which disengages the transfer case from the driveline. Check for slack or binding in the transfer case shift level linkage (clean and lube the linkage won't hurt).

Sorry to tell you this. You have an AXOD/AX4N Transmission and it is going bad on you. Soon, it is going to strand you on the road.

This Transmission is a Money Maker for the Mechanics and Transmission shops around the world.

Some people will put Lucas into their transmissions to extend the life of the Transmission but there are people who do that and cause it do DIE!!!! and I mean Immediately.

I am sorry to give you the bad news but at least it is Honest...
P

Failed Transmission Again

Part with it

Get something else

Maybe American (Rear Wheel Drive Only)

I suggest you use GM Tech2 diagnostic scanner
check your car and clear fault code.

I belive that it should stay constentley light. Try to put it into 4 wheel drive. Put it in reverse back up about 10' Put it back in drive and see if it works...Best of luck

try shifting it to neutral and wait a few seconds,if it still flashes try shifting it to drive and wait a few seconds,then reverse.if it still doesnt lock in then move the vehicle a few feet either forward or reverse,worst case the electric motor on the transfercase is bad

just a suggestion but I had this with another make fwd and I had to put inreverse and drive several hundred feet and tehn switch out while i was driving

under air cleaner box, reverse switch, one green and white wire. needs good connection to ground through sensor for full spark. happened to me 3 times now, very bad connector by yamaha in my opinion. about every 29 hours of riding it will need to be tightened, hope this helps.

wire under the air box, green and white, loose