SULASTIC SHACKLES INSTALLED

[WHITESSTOWPIG]

Lots of guys wonder about these but never pull the trigger well I installed these in a RCSB that is lowered 3/5 to soften up the factory rear leaf springs and the difference was almost nothing.These are very simple in design replacing the factory solid shackle with what is essentially a damper so any Silverado lifted, dropped, or even stock height with a factory shackle geometry should be able to benefit from these.That being said I have felt bigger differences in ride quality with simple $80 shock changes than I have with these $440 shackles.The only minor improvement is in very slow speed vibrations under 30mph.Anything over 30mph with uneven payment, bumps, or pot holes the difference is disappointing. Hopefully if your on the fence about these you will come across this and consider spending your money on something that will make a difference.Just my own findings you guys of course are welcome to purchase a set to see for yourselves

[Grumpy Bear]

They're not springs. They don't change spring rate. They are active insulators. 

2 hours ago, WHITESSTOWPIG said:

The only minor improvement is in very slow speed vibrations under 30mph.

Yes, this is what they do. Until one makes a meaningful change in spring rate big changes are not happening.

 

I had Deaver spring make a set 15% softer and with 11 leaves instead of 2 and a helper. Now there's a change you can feel. Then the insulators work better to a higher speed. Around 45 from my setup. King shocks were another big improvement and loosing about 200 pounds of front coil rate. 61 Cadillac? No... but allot better. Thing is, a combination of smaller moves works better than expecting a one hit silver bullet for your Silverado.  Anyway, when this set wears out I WILL be buying a second set.