I have a 2000 Mazda B3000 pickup truck.Question: I have no reverse when I put in reverse it is like it is in neutral,  do you have ideal what it could be?Answer:  This is a Mazda built 5 speed MX5 our part number MTMAZ007m these transmission  do have issues with 5th and reverse gears.  Based on our experience its probable your rear cluster gear bearing has started to fail allowing reverse gear to move back out of engagement when shifted to reverse.We can supply all of the parts needed to fix the issue:

• Bearing Counter Shaft Rear our part number MWT6304-N your cost is $8.00

• Update Kit for 5th/Rev includes the 5th Gear, Reverse CS gear, Fork and Slider part number MWTFOTZ-7C391C your cost $125.00

Plus S&H.  Need more technical help give Scott a call 888-824-2012 he can help you.  You can see the other transmission parts we offer on our site.