T4R2014
Elite Member
I had rusted Diff on 02 T4R in 2016 186,000mi. In 2010 I walnut blasted underside +rust inhibitor+Rustoleum+Zibart. No exterior body rust, interior has sheepskins since new, all looks new, serviced by the book, except for re-occuring frame and diff rust.Dealer ordered $1200 rear axle assembly for rusted Diff fix. Before going through with that and $2500, I had dealer do a courtesy state inspection. Didn't know the frame was cracked until the dealer said they would not pass state inspection on it, but they also wouldn't repair it. WTF?! got pissed, went to Barnes 4WD Diff cover replaced it in 2016. At same time had welder weld frame areas and coat with AMsoil HD. Toyota won't acknowledge it as a recall issue even with pictures of inside out and full service record. They gave me a $1,000 credit if I buy a new or used Toyo within a year. Welded the frame and Barnes Diff cover and added Amasoil Undercoating for <$1,000. I'll drive the '02 until one of us dies or I run out of $$ fixing it.
Will never go to a Toyota dealer with my T4R again. they only want to work on new and easy stuff.
Paint is to make it look pretty and Zeibart is bull.
Get yourself a spray gun and fill it with used motor oil, or Fluid Film, or both. Get your 4Runner up on a lift and spray. Use common sense, don't spray into your radiator or on the exhaust. Spray inside the factory holes you see in the frame. All of them. Spray until it starts running out. See any exposed bolts or cavities? Grease that ***** up. Fender lips? Get greasing.
You live in Maine. Any New England state is essentially a death camp for your car and anything living past 10 years there is doing pretty good.