My reverse went out on my 2005 GMC Serra 1500 truck but, have drive with no issues?

I believe revers has gone out, take it to a trany shop for proper diagnosis.

I was informed it does not always have to be a trany replacement and could be some sort of link gear to the reverse trany that went or a cable line, does that make sense? I will def have a shop take a better look at it. Just over the phone from one shop, without even diagnosis they are saying my whole trany needs to be replace and going to cost me around $2,500.00....insane and not where I plan to take my vehicle if they are just guessing and assuming off the bat that that's the issue.

In the area that I live in it would be $1800 for a trany rebuild, taking it out and re-installing it. But in those years trany there is a known issue with them, and I think you'll find that it is going to need rebuilding.

Is it throwing a Check engine light? There are solenoids in the pan at the rear of the pan(inside it) that control the shifts I'd go through that route. Also when you pull the pan is there metal shavings in the fluid or do you smell burnt fluid? That would be first if you think it's shot there are rebuilders that will guarntee it for 3-500$ range you just have to pull it.