Originally Posted by revrnd
Great White, nice looking trailer & truck.
How long have you had the truck & do they use salt on the roads in BC? The reason I ask, a lot of the GMT400s ('88-'98) extended cabs here in Ontario are showing rust damage @ the rear cab corners & above the box wheel opening. I had a '94 K1500 for 6 years & sold it w/ 100,000 miles on it. I washed it more often in the winter than summer & the only issue I had was surface rust where the tailpipe heat had burned off the paint. Easily fixed before selling.
I've had this truck for about 6 months now. But I've owned GMT 400 chassis trucks for years. I bought this one and scrapped my last (89 ECLB K1500) because of terminal frame rust (it was an east coast truck). This truck is sitting at 406 000 kms right now
and still dieseling on....
Where I am in BC (vancouver island) they don't even really get snow. When they do, it might last a couple days at most. Temps rarely drop below 0c. So, no salt to really speak of. Heck, I don't think my town owns more than 1 plow truck!
GMT400's rusting in the cab corners, ext cab rockers and rear wheel wells are common. Thing is, these panels rust from the "inside out" and here's why:
The rear wheel wells are double walled (inner fender and bedside) and trap dirt in between them where the are welded at the fender lip. This gets wet and forms a "mud plug". This holds the moisture against the metal. The sun warms the metal from the outside and you have the best possible conditions for rust to form. I make it a policy to shoot high pressure water between the panels when I wash the truck and I keep spraying until it comes out clean on the other side of the well. Yes I'm adding water, but since I flush the dirt out, it dries quickly and staves off the rusties.
The cab corners rot because the cab drains plug with dust and dirt. It cakes on from the outside and runs down the panel from the inside. I periodically pull the rear interior panels off, flush the back side of the panels and finish with a rust preventer fluid of some sort.
Haven't had a panel issue yet that wasn't already in progress....
This one has clean rear wells and just a hint of rust in behind the ext cab rockers. Sure enough, there was a layer of dirt in the bottom that had clogged the drain vents solid. It was an easy afternoon to clean it up and shoot it with new paint. Then a good coat of rust preventative oil and clean out the drains.
Good to go for another 20 years....