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Jul 21st, 2025 | | | | Joined: Feb 2012 Posts: 43 New Guy | | New Guy Joined: Feb 2012 Posts: 43 | I found 4 7.5 x 20 mounted with new rubber and 4 9.00 x 20 mounted with 80% rubber. I was thinking of the 9.00s on the rear (more speed) and 2 7.5s on the front. They measure 3" difference in height so the question is will this pitch the truck to far down in the front (look stupid)? The 9.00s are not military tread and they are 10 ply. | | | | | Joined: Dec 2003 Posts: 1,144 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 1,144 | I have seen 750s on front with 825s on the rear and didn't think it was to bad. I haven't seen the 750 with 900 rears | | | | | Joined: Feb 2004 Posts: 28,675 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,675 | You'll create some steering wander by reducing the caster angle with the raised rear end. It might be necessary to add a thicker caster correction shim on both sides between the axle and the springs.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | knuckles: well I wouldn't have said it that way but yes, it will look stupid, not to mention Jerry's point that it will create steering issues (re: safety) you don't need.
| | | | | Joined: Nov 2009 Posts: 86 'Bolter | | 'Bolter Joined: Nov 2009 Posts: 86 | If the overall height difference of the wheels is 3 inches, wont that only effect the height difference at the hub by 1.5 inches, and isnt it going to be the height difference at the hub that determines where the suspension carries the chassis?
I know I'm pretty redneck, and cant tell cheap wine from good wine, etc... But I doubt that I could even spot a 1.5 inch difference in the height of the front and the rear.
I'm too lazy to do the math to figure out how many degrees that comes to for the effect it has on the steering... Would also have to know the wheel-base... The longer the wheel base, the lesser the detrimental effect to the caster angle would be, wouldnt it? | | | | | Joined: Aug 2009 Posts: 184 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2009 Posts: 184 | Another thing to think about is that the 9x20 will also be wider than the 7.50 or 8.25's so you may have clearance issues between your duals or to the springs.
As to looking stupid, put some blocks under your truck to simulate the height difference and see what you think. If the 9x20's are 3" taller it will only raise the rear end 1.5", not 3". I personally wouldn't worry about the difference in caster angle. It may theoretically cause a difference...but probably not noticeably.
Tad
1946 Chevy OS 1.5ton, 1955 GMC 3100, along with other various IH,Ford,Nash,MGB,.....
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