Stancor 586-902 GPR mod
 

Anyone done this? Does it work like advertised? Any info appreciated.

Nope, never had any issues with my NAPA GPR (GPR-109). But IIRC that thing is huge!

Yeah, as Dave said, the factory (style) glow plug relays seem to do just fine for me as well.

I haven't done this, but here's a write up that you can look at if you want. Welcome to guzzle's Stancor GPR replacement Mod Web Page

We've replaced several with just the standard GPR on trucks we've worked on, thought about the stancor, but if you think about it, they regular ones still last a long time and don't look soo huge.

I've done it and the Stancor relay works just fine going on 3yrs now.