I bought a brand new early '91, put nearly 120,000 miles on it in 11 years or so, mostly towing a 7000 lb. 5th wheel. I cranked up the pump a bit, had all the banks stuff, and added propane injection - I was NEVER passed in the hills by ANY other truck with a similar load - and in the time and miles I had mine, only part to fail was a $12 voltage regulator. I had a US Gear OD unit installed, the 3. 07 differential and the old 3-speed 727 auto transmission. ABSOLUTELY the BEST and most reliable vehicle I have EVER owned! The paint, interior, and all mechanical functions were as good when the new buyer drove off my place in '02 as the day I bought it - the paint, interior and all were very nearly like new, even tho' the truck sat outside 24/7! Shucks, it still had the original leak-free shocks on it, the front brakes had been replaced once, the rear drums had never been touched.
The guys in their new "quieter" 3rd generation trucksometimes tend to look down their noses at guys like me who have made the move to the 2nd generation trucks like my '02 - but *I* will NEVER knock or make fun of the first generation stuff - had FAR too much perfect service outta mine - and while I fully appreciate the newer features provided by my newer truck, it has some REAL big shoes to fill as far as the excellence and reliability of my '91 is concerned!
Check out the pointer above my sig below to see pics of my '91 in the Wax/polish test album - and be PROUD of your 1st generation trucks - they have NOTHING to be ashamed of!