“Stock” 40:Wow! I find my locked cruiser taps out in 2 foot of power snow even aired down with chains on all four fully locked, less in heavy greasy snow. The axles just don’t have the clearance.
Yours must have been a monster.
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Siping doesn’t help get you much further, it helps you stop those uncontrolled slides.
When you slide your tread fills with snow becoming flat like slicks. siping allowes little gaps to flex open that don’t fill with snow and act like little claws.
1/8” steel floor and inner fenders (essentially 1/4 tub less outer 1/4 panels)
950 kg front axle
1150 kg rear axle
Within 50 kg side to side (depending on cargo and fuel)
Open diffs (on flat streets less of a concern than off road)
Bush bumper that acts like a plow (enough anyway)
250 hp 350 SBC
31 x 10.50 tires
Got stuck countless times. Unstuck process started with digging out the grill so air could reach the rad, shovelling out from under rig and behind wheels, backing up, taking another run at it, getting stuck again, and repeat.
It wasn’t powder… once I risked airing down below my regular 21 psi, I found it’d pack hard enough to climb up it enough for axles not to get high centred. In deeper ruts the momentum helped me to slide across somewhat… and the ruts being from wider vehicles must have done the rest.
It’s not a monster… so I’m not 100% sure how I was able to do it. I had parents to get home to their 1.5 year old… and needed to get home later myself. The freezing rain at first had me stalled, but 10 psi gave me enough flotation to make forward progress again.
It was one heck of a way to test drive a swapped in running engine. The carb was in desperate need of a rebuild, yet it did its job. That engine ended up lasting 20 more years after I threw in an RV cam and 4 barrel. The sludgy state inside of it was likely what ultimately led to a spun rod bearing… and it being pulled.