Shocks

[AH64ID]

Here is a tire chart. The math method that Micahel does is how I used to do it; however, I think these are more accurate since they are published just for that reason. 

 

https://toyo-arhxo0vh6d1oh9i0c.stackpathdns.com/media/2125/application_of_load_inflation_tables_20170203.pdf

[Mopar1973Man]

Just for fun comparing...

 

 

35 PSI 1700# = 1700 / 3042 = 0.55 x 80 = 44 PSI 

40 PSI 1870# = 1870 / 3042 = 0.61 x 80 = 49 PSI

45 PSI 2030# = 2030 / 3042 = 0.66 x 80 = 53 PSI

50 PSI 2205# = 2205 / 3042 = 0.72 x 80 = 57 PSI

55 PSI 2335# = 2335 / 3042 = 0.76 x 80 = 61 PSI

60 PSI 2485# = 2485 / 3042 = 0.81 x 80 = 65 PSI

65 PSI 2623# = 2623 / 3042 = 0.86 x 80 = 68 PSI

70 PSI 2765# = 2765 / 3042 = 0.90 x 80 = 72 PSI

75 PSI 2905# = 2905 / 3042 = 0.95 x 80 = 76 PSI

80 PSI 3042# = 3042 / 3042 = 1.0 x 80 = 80 PSI

 

I think I'll keep my math thank you... 9 PSI drop at the low side of the scale is rather way too soft for the amount of weight. 

[AH64ID]

Yes the math has always put more air into the tires than the load inflation tables, but the tables are more accurate. 

[Mopar1973Man]

Not all table are created equal... This Michelin weight to pressure table. Same sized tire and capacity...

 

35 = 45 PSI (10 PSI different with Michelin)

40 = 48 PSI

45 = 52 PSI

50 = 57 PSI

55 = 60 PSI

60 = 63 PSI

65 = 68 PSI

70 = 72 PSI

75 = 76 PSI

 

Still in all this would with either table have my rear axle pressure below the 35 PSI because tire weight is only 1430 pounds (Axle weight 2860 / 2). So would a person gamble with 30 PSI at 1,430# ???

 

1430# / 3042 = 0.47 x 80 = 37 PSI (Currently set to 40)

[AH64ID]

I've ran mine as low as 35 on the rear, table weight,  and they wear great, have great traction, and don't get hot. 

 

XPS Ribs have a steel sidewalk and likely the reason for slight differences. They will also have a higher minimum pressure, thou neither table goes that low. 

Edited June 26, 2017 by AH64ID

[Mopar1973Man]

So my current pressures I'm 60 front 40 in the rear. So using your tables I would be 50 in the front and 30 in the rear. MPG??? 

 

Just for fun, I'll try your table and pressures.

Edited June 26, 2017 by Mopar1973Man

[CSM]

1 hour ago, Mopar1973Man said:

So my current pressures I'm 60 front 40 in the rear. So using your tables I would be 50 in the front and 30 in the rear. MPG??? 

 

Just for fun, I'll try your table and pressures.

 

I have done similar low pressures and liked the ride...  With stiffer sidewalls i got away with it.

[AH64ID]

35 is the min I would run for non-winter paved road speeds. 

 

I run 55-65 in my fronts. At 55 they ride great but on winding roads with constant turning they are a little soft for cornering with a 5200lb front axle at 55 mph. At 3300lbs on my rear axle 35 is overkill, but that's the lowest I'll run for street use. For back roads I run 45/25 and the traction is awesome! But it's not enough air for paved road speeds. 

 

My 19.5's are a different story as 70 psi is the min I can run them. That's below the min pressure on the tables but approved by Toyo. I run 70/70 empty and 80/table for loaded. The most I generally ever need is 95 psi, but I have needed 110 once. 

 

Table pressures are what's required to carry the specific load. More pressure may increase stability, but much more than 10 psi too much can decrease traction, tire wear, and increase susceptibility to road hazards. 

Edited June 26, 2017 by AH64ID

[WiscoRedkneck]

Just got mine back from the shop whole new front end and some upgrades(heavy duty ball joints, oversived sway bar end links, and track bar) I also ended up with Billstein 4600's cheaper than Rancho and recommended above the similar price Monroe gas shock.

So far I can say is this truck handles better than it ever has and I can honestly say I don't know if any one thing made a vast improvement but all together the steering is tight enough and responsive enough that it'll take a bit of getting used to....  and btw it's nice to actually feel the suspension doing it's job versus having to keep your mouth open so you don't chip a tooth when you hit these sink holes and or missing patches of road

Edited July 8, 2017 by WiscoRedkneck