Rearend oil weights and MPG

MopaR&D said

I agree with AJ however you note you get knocking at idle, that's pretty much impossible... spark knock only happens under load, you must have something else going on? Also @AJ/FormS since you've had your Orange Box so long it's probably a "good" one, the ones made in more recent years are crap and if the OP's isn't a 25-year-old used piece it very well may be causing problems, ironically lol.

Click to expand...

I only used that Orange box for 3 or 4 years. I bought it in about 1997 or 98. But the car didn't hit the road for the first time, until late 1999. And the box got pulled perhaps in 2003, when I tried CDI, which failed right away. So then the Orange box came back on line while the CDI got warrantied. In the mean time I installed a Jacobs dash-mounted,dial-back, timing box, which had an Amp built in. And then I retired the Orange box again. And when the replacement CDI box came back to me, it went straight into storage, and is still in it's sealed shipping carton. I have never verified that it works.
Some years later I installed that Orange box on my brothers mid-70s Dodge camper van, which I saw last spring still hauling stuff.