My 2001 Silverado has 135,000 miles with stock suspension other than a 2/4 drop. Recently the bushings have started to squeak badly, especially the rear. I sprayed them all with WD40 which worked great for about 3 months, then the squeaking came back even worse.

I know the best solution is to replace the bushings all together, but is there an aerosol spray that works better than WD40? Even if it only lasts 6 months I would be happy.

 

Try spray silicone lube.

 

Look for something "marine grade" as it tends to have better water shedding traits.

 

WD-40 Specialist Multipurpose Grease is marine rated and you can get it a Walmart.