Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
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A little input to whoever wants it... FYI... the chevy in my sig, or variations of it, a CUCV military one ton, with 39.5" boggers, I would run 15 psi... that is with the truck weight of about 8K lbs. These superdutys are gonna be a bit more than that, but not alot. I ran my truck off road mostly, but even on road, I never aired up any. This is just a point of refrance, Powerstroke 81, you said you're running 35 PSI in 38's, to me that seems way high... I'd bet you could run 25 psi and be ok, but there's alot of factors to take into concideration. The width of the tire, the hight, the rim size, all are gonna effect the handling caricturistics and safety of the set up...
From what I understand, it takes a given ammount of air to hold a given ammount of weight off the ground... if you take that ammount of air, and compress it and put it inside the smaller volume of the stock size 235/85R/16 tire, it's gonna be 50-85 PSI to carry the load capacity of a superduty. If you take the same ammount of air and put it in the larger vollume of a 38" tall, 15" wide mud tire, you're not gonna get near the same PSI, and once you reduce the PSI to compensate for the fact that you might not be loading the truck to rated load, (as you would when you are running only 50 PSI in the stock tire) it's gonna be even less.
I would expariment with it if I was you... try lowering the PSI a bit and see what happens... if it feels mushy in turns, maybe it's a little too low... you don't want the tire to roll off the rim in that situation. You try to find a happy medium.
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
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E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k