I have a 25.5 gallon tank on my 79, the 84 parts truck has a 33 gallon tank. Are these tanks interchangeable? I have a skid plate from a 33 gallon tank off a 79 on the way. So that won't be an issue. Any help would be appreciated.
I checked some part numbers and they have different part numbers for 33 gallon 78 and 33 gallon 84 tanks. I dont see why it wouldnt work however. Just make sure the breather tube is on the correct side. 78's have an external breather tube (later years and inside the filler neck I think) and mine was on the rear side of the filler neck. I think later years might have them on the the front side of the filler neck. You could adapt the 84 filler neck if this is the case, or just modify the current filler neck to attach the breather. Not a big deal, just a breather.