I guess I somehow got it reversed at some point. I could swear we went over this time and again and the correction was trucks were 3:08. I mean the threads from when Andy was here. He was the book smart knowledge and I was the knowledge from personal experience and conversing with the other 67-72 truck owners since new. And 3.08 was always the common knowledge reference, as I recall. I better stop recalling
. Honestly, I never paid heed to any ratio taller than 3.73. In fact, 90% of my trucks have had 4.10/4.11 and lower gearing for the grunt. I ordered my '92 K3500 with 4.10/5spd and loved it. I got a '95 with same powertrain except 3.73s and hated it off the line. Was looking to go to 4.10s before it lost it's life. Not until the dollar has gotten so hard to spread that I've given a hoot about better hiway gearing to save on fuel. I routinely drove my 4.10 equipped trucks down the interstate at 70-80 mph and never gave it a thought. In fact, I love that sound! The engine in my '72 GMC I rebuilt in '91. It was in my Cheyenne Super K/20 and in '04 I swapped it into the Sierra K2500. That same motor, still healthy and strong, has countless hours of the RPMs that 4.10s and that speed produces. I also had 4.10s in the '71 Custom Camper I had for 18 years and traveled as far as Grand Canyon in it at hiway speeds. I have that uncracked (except no-lead head job and timing chain) original still healthy motor on a stand waiting for it's next assignment. O/D definitely adds life to a vehicle...if you don't make up the drop in RPM with higher speed driving. But in my experience, driving at 3 grand plus never hurt a thing. And if I want to save on gas I just drive slower.