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Old 11-29-2009, 01:00 PM   #1
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Interresting Calculators for everyone

As I am going to Re-convert (just axles) my Van using Superduty axles and mounts from Ujoint Offroad (Chris is a big help, he posts here and other Forums as Ujoint) to deal with the added weight of the bumper, winch, and snowplow. I am planning on using his 8" springs to give me 4" more lift and to allow for 35" tires. I started looking for easy Ratio Calc's to make life easier.
http://www.4lo.com/4LoCalc.htm
and this chart makes it easy. It uses a 1:1 trans gear and 65MPH (but it is easy to figure for the OD) so by looking I can find my current tire and ratio and come up with 2809RPM at 65, to change my MPG a little for the better with my planned tire size (35") I should swap to 4.11 (4.10) ratio to get the RPM's down to 2493RPM at 65.
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Old 11-29-2009, 05:02 PM   #2
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Re: Interresting Calculators for everyone

Nice link, I've used that site before. Is 65mph realistic with 8" of lift on a van?

Oh, and you have a typo on your post-4.11 rpm's. I think you meant 2565rpm's not 4565rpm's.


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Old 11-29-2009, 05:47 PM   #3
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Re: Interresting Calculators for everyone

I have mine up to 75 daily and have had it at 85 once or twice. it has 4" of lift (from stock) on it currently. With the right springs and swaybars 35" will not be a problem. 305's are close to that and I will also be going with wider wheels to make it more stable. Corrected the typo.
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Old 11-29-2009, 09:32 PM   #4
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Re: Interresting Calculators for everyone

I drive my Quigley 4x4 van at 85 regularly on the freeway here in SoCal. It's not a SMB and only weighs 6700 pounds. I didn't before the sway bar and better shocks. But now it's much better dialed in.
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