The wheel swapping didn't go without drama. back pain for the rest of the weekend and ER trip on Tuesday as I was not bale to get out of bed. Rest, muscle relaxant and anti-inflammatories and almost back on my feet. Careful when handling 90+ lbs wheels.
I've driving around with the new wheels for few days and I like the ride (45 psi), I may have lost a little bit of acceleration but I can still accelerate on the hwy on ramps and do not feel loosing any speed on climbing the overpasses (This is Houston, TX and these are the only elevation changes in miles).
I've run some numbers on this table and I am looking at different factors:
RATIOS
Option 1 is the van's oem with the original ratios. Option 2 is what I have after the gear change and 4x4 conversion with F350 wheels. Gear/wheel ration increased by 1.2%. I didn't have any issues driving the mountain roads in New Mexico or Colorado.
I am running Option 5 today but the tires are pretty worn down so I need to replace them. The speedometer is spot on with the GPS. It was also spot on with option 2. I am guessing the wear on this tires is putting the diameter close to the 33.4 of the fairly new michelins I was running.
If I go with option 4 (305/65/18) the ration will be close to what I had until now. If I do option 5 (325/65/18) the ratio will be 4.2% higher than the van original configuration and 3.0% taller than the f350 wheels.
WEIGHT
Option 5 is 10 lbs heavier than option 4. Harder to install and handle (see my recent trip to the ER). From a Rotational Inertia, that weight is in the outside where it affects the most to the acceleration.
COMFORT
To keep the same 2,500 lbs capacity per wheel, option 2 (f350 wheels) has to be at 55 psi. Option 4 at 46 and option 5 at 42.1. I think that both 4 and 5 will give me a smoother ride compare wit what I've been running with slightly advantage fro the 325
RIM SIZE
The new rims are 18x9. Options 2,3,4 and 5 will work, but option 4 (305/65/18) seem to be optimal for 9" rims
COST
Going whit Falken A/T3W I can get Option 2 (275/70) for around $800. Option 4 (305/65) for $1200 and option 5 (325/65) for $1100 (surprisingly cheaper).
AESTHETICS
The main change, I think is coming from the rims sticking further out. Between 305 and 325 I do not think is going to be very noticeable as they will fill the fender quite wheel, and they are only 1" in difference.
I am leaning over option 4 (305/65R18) but any feedback will be appreciated.