35’s on my 72 K10 SWB, stock lift <pics>

[CalSpeed]

Just picked up my truck from tire shop. New BFG MT K03 35x12.50x15’s. Stock height no lift. Looks great no rubbing on street driving but definitely wouldn’t be safe todo any off-roading / wheeling with or I’m sure it would majorly hit fenders.

Tomorrow morning goes on the 6” skyjacker front spring kit, 4” rear shackle flip kit, front/rear/stabilizer skyjacker shocks. I’ll post the after pics soon as I get done. Tires are supppppperrrr smooth and quiet at 70 mph. The 4-spd trans is nice with the stock 3.73’s. Found myself using granny low 1st now from a stop and the gear spacing is great now that I can use first. I was dead set on going 4.56 gearing but now I’m not sure. It’s like having overdrive in 4th now.''/

Update: Pics with the 6" skyjacker front springs, shocks, and ORD 4" shackle rear flip kit installed. Sits perfect. Rides great.

[CalSpeed]

I can’t get the pics to not be upside down. Sorrrrryyyy

[mongocanfly]

Better?.

[1976gmc20]

It’s like having overdrive in 4th now.

I had a 1980 K-10 that came from the factory with some un-godly high axle ratios. GM attempt to improve MPG and I guess it worked. With just the stock tires it would get 18 mpg at the then legal 55mph and 15 mpg at 80mph ("theoretically" of course ).

Around town you had to drive in 3rd gear most of the time; it would buck and lurch in 4th at anything below 35 mph. But I still didn't use 1st for starting except on a hill or pulling a load.

It actually worked out pretty good. I didn't have a tach but you could run up to 55-60 mph in 3rd and not be screaming at all. Actually worked nice for trailer towing as you could shift down to third and hold your speed on almost any hill.

First and low range was still slow enough for any "off road" stuff that I did, but I wasn't pushing it very hard as this was my work truck for timber falling, and it was new enough at the time and low enough to the ground that I wasn't really taking it out to play.

You might look into one of those 203/205 "doubler" transfer cases which give you two low ranges including about 5:1 for rock crawling. That way you would have good gears on both ends of the speed range.

[mongocanfly]

35s and a1:1 trans gear is giving you 2507rpm at 70 mph with 3.73s
4.56s will turn 3064rpm at 70mph

[67swb72klb]

That truck looks good like it is..

[Benjamin]

The 4 speed granny low is great with big tires. I have kinda-sorta been daily driving mine for a few years now and I will repeat what a lot of guys said above. The deep first gear is great for getting the big tires rolling from a dead stop and even on a hill. When I hit 4th gear I'm not turning more than 2500 RPM at any posted speed limit. And for 90% of the off-roading I do, granny low and 4-LO is plenty of gearing. Don't mess with the axle gearing. If you do, then you are going to wish you had overdrive when you hit the pavement. I have a friend with a K20, 37 inch tires, and 4.56 axles, and he is wound out at 65 mph. If you want to have a lower crawl ratio look into a 205-203 doubler. Or just drive as-is, I'm plenty happy with my setup.

[Benjamin]

ps, when my pics post upside-down, I'll open in Paint, rotate 180 degrees twice, save, and then edit the post to replace the pics. works 99.99% of the time