What rear end will interchange with my " 2003" B3000 Mazda 2 wheel drive one side has bearing noise truck has 119000 on it so thought it's best to change out rear with maybe a few years newer one if i could disc brakes set up would be awesome

 

Welcome to the forum

You need to know what rear end Ratio you are running first

Go here: https://therangerstation.com/tech_li...le_codes.shtml

Get the code off the drivers door label

You can run a 7.5" or 8.8" rear axle but if you want speedometer/odometer to remain accurate then you need to match current ratio
You can run any ratio you want just need to program the computer for the new ratio if you change it, especially if you have an automatic, it uses speed for shift points
OPEN or Limited slip(posi-traction) is up to you, doesn't effect anything except traction

Any rear axle from 1998 to 2012 Ranger will bolt in plug and play, 1993 to 1997 would also work
The 2010-2012 Rangers did have rear disc brakes, you do need to change e-brake and line routing parts

Explorer axles will work but need modifications

But you can add rear disc brakes to any Ranger rear axle, one option is here: https://therangerstation.com/tech_li...nversion.shtml

Outside of saying "I am COOL I have 4 wheel disc brakes", I see no advantage to rear disc brakes on a pickup truck, not an upgrade in my opinion, especially if you have working 4-wheel ABS, or just rear ABS
Cars and SUVs have 60/40 braking so the rear discs can be better, pickups use 70/30 so no real need for rear discs

60/40 means when you press on the brake pedal the Master or proportioning valve sends 60% of the pedal pressure to the front brakes and 40% to the rear brakes
This is used on cars and suvs because they always have weight on the rear axle
Pickup trucks don't, so they use 70/30 to prevent rear wheel lock up, even with disc brakes, 60/40 would lock up the rear tires on a pickup, assuming no ABS

 

Thank you for info