[Christ]

Originally Posted by wriley4409

One very big improvement that I have not seen discussed in this thread is switching to fully synthetic lubricants in the transmission, transfer case, and both differentials. There is so much friction going on between the sum of all of those moving parts that switching to a good synthetic lubricant would make a really big difference in your fuel economy.

OH, we didn't discuss that because everyone who frequents this forum already knows that I'm probably the 2nd biggest synthetic oil monger there is. LOL.

I checked the door card on the driver's side, since I just bought some tires from a guy and was already out there anyway.

Axle - 19
Springs - K4I
Calibration code (for paint? not sure) 6-51H-R06


Guess I should go look for a Axle# 18, eh? Does anyone know the actual tooth counts of the ring and pinion gears for a 3.08, in case it's been changed from another truck? People do that, ya know...

Also, does anyone have the spring codes and what they're for?