Airbags for my 84 Allegro

I am assuming this is for a P-30 chassis. It is an easy job as others have said once you heat the bag, roll it up, and jack up the front to stretch the springs. Before you buy the bags I would check the ride height with the jacks up and see if your springs are shot first. On an 84 they are likely to be worn depending mileage on the weight of the chassis. There should be about 1 3/4 ins depending on what chassis you have. if you do not have the correct ride height I would just replace the front springs with HD springs and eliminate the bags completely. I replaced mine with the springs from Henderson, but Stengler and others make a good HD spring.