Towing we'd all agree is harder on a vehicle than not towing. Doing proper maintenance counts. How you drive counts - on my trip from Va Beach to Pa yesterday we did 70-75 mph (car only) and got passed repeatedly - do you think a Smart Car or Fiat 500 driven at 80mph+ is going to last as long as one driven at 55mph? Do you think people that 'abuse' (ok, use hard) their vehicles do the extra maintenance, or do you think they might opt for the '7500' mile oil change and '30k' mile air filter schedule?
So how did the OP use and maintain his truck?
Still the factory transmission after 175k? Possible, but not likely. Around here 120-130k is about normal mileage for a transmission replacement. But again, how is it used and maintained? I know folks that get 90k on a clutch and others that get 20k.
Perhaps something went sooner that it would have otherwise...whose to say?
On my expy the trans (if you believe the original owner) was original at 230k miles. I put 4k some of that towing a 6600lb trailer and the trans started to slip. Had I not pulled a trailer I'm sure the trans would have not gone bad. Maybe if it had pulled such a trailer from new the trans would have given up at 120k like most transmissions, or maybe at 60k from hard use.
Having had friends with 79-82 vintage GM vehicles many with 305s in them, I'm surprised yours is doing as well as it is. You must maintain it well and not use/abuse it. The 305s were great for munching pistons in cylinder 5.
Jill & Chris, Wills (14) Evie (11) & Toby our collie (5)
2011 Grey Wolf 28BH
2013 Chevy K1500 Crew w/ Reese StraitLine Dual Cam
Nights camped 2011: 11 2012: 18 2013: 12 2014: 12 2015: 13 2016: 3