Suspension and Tires - JeepForum.com
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  • 3 Post By JoonHoss
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post #1 of 11 Old 10-13-2021, 09:47 AM Thread Starter
JeepGuy41
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Cj Suspension and Tires

I have an 84 CJ7 currently with 32 inch tires. The suspension needs to be gone through and replaced but before I do that I would like to have a good ballpark range of what tire size I want to go with. Currently thinking 33 or 34. 34's seem hard to find however for the 15 inch factory rims which I want to keep. Does anybody have photos of their CJ7 on 33s or 34s? Also if you could tell me your lift height it would be much appreciated. It is a daily driver so it can't be too tall in lift height just to keep it from being sketchy. Thanks!

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post #2 of 11 Old 10-13-2021, 10:47 AM
JoonHoss
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I've always been partial to 32s and a 2.5" lift on CJ7s.

Here is my '83 with that set up



You won't find a true dual purpose tire in a 34" height for a 15" wheel.

Do you know what your current gears are?

Hoss
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post #3 of 11 Old 10-13-2021, 11:17 AM
jurgen24
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Suspension and Tires

33, 2.5 lift, 4.10 gears (with T5) are are good combinations for mild+/medium trail rig.

The only issue I have come across is that some tire shops will not mount a 33 tire on a 7 wide (stock) wheel.


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post #4 of 11 Old 10-13-2021, 11:19 AM
Nick4320
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Most people here will probably tell you a 2.5 in lift works best. Ik alot of people have an old man emu leaf spring set, with the front converted to the YJ springs.
Me personally I have a rocky road outfitters kit, which is a old man emu conversion. I think everyone who has done this conversion is highly impressed with it.

As for my tires im currently running 33s pro comps. It looks great rides great, but a little rubbing on full flex. So I have a 1in body lift in my future.
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post #5 of 11 Old 10-14-2021, 08:26 AM Thread Starter
JeepGuy41
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Stock gears currently i believe. That is partially why I am trying to figure out what tire setup I want to go with so I can base suspension and gearing off of that and get it ordered especially with shipping delays so it can be done before the new year. I do like the look of that setup.
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post #6 of 11 Old 10-14-2021, 10:23 AM
bob4703
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There is a little known and if known often ignored relationship between tire size and gear ratio. Larger tires also can decrease your braking efficiency. Lifts if not done properly can affect on road driving and make access harder for the ladies of shorter stature.

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post #7 of 11 Old 10-15-2021, 10:06 AM
Matt1981CJ7
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The general rule of thumb is a 2.5" lift will allow 32" tires without any rubbing at full flex/tuck.

33" or taller tires will require more lift.

I'm with JoonHoss, I think a 2.5" lift and 32" tires is the perfect look for a CJ. Anything taller looks weird, IMO, and requires more work to retain good drivability.

Here's mine with 2.5" OME lift and 32"s. As you can see, the 32" tires barely clear the tub at full tuck. 33"s would surely rub.

Matt
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post #8 of 11 Old 10-15-2021, 10:41 AM
keith460
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Same here, 32" tires and 2.5" lift are an excellent sizes for the CJ for good drivability, road manners and looks. But proper gearing is a must for larger diameter tires in order to take full advantage of a CJ's potential.

I have a 4.10 gears with a T5 and 32" tires, along with a 2.5" OME lift. Great for the hilly terrain I live in PA. You might want to consider 3.73 gears for a much flatter Florida.
I had a 3.5-4" lift, 33" tires and factory 3.31 gears. What a god awful setup that was. Wander on the road as wide tires like to follow the grooves in the road. Gearing that was too low, the Jeep couldn't get out of its own way and a ride that was like sitting in a horse drawn wagon heading out west.


It's no mystery as to why Chrysler has 4.10 gears and 32" tires on factory Rubicon models with the V6 engine. They know what it takes to turn large diameter tires and a vehicle that weighs, when fully equipped, much, much more than a CJ ever did.


img_0122.jpg

img_1771.jpg

img_1772.jpg
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post #9 of 11 Old 10-15-2021, 02:18 PM
80cj
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Nice flexy OME springs...
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post #10 of 11 Old 10-16-2021, 10:40 AM
pg_jglr
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If you are looking for more of an engineering type look there are several sites that will help. I ran the numbers when planning my transmission / transfer case swap using these sites:

http://www.offroaders.com/info...cor...alculators.htm

http://www.grimmjeeper.com/gears.html

My drive train consists of: AMC 304 --> T-18 (1st @ 6.32) --> D300 (low @ 2.62) --> Stock axials from 81 CJ5 (HH code @ 3.73) --> 33" tires. I originally wanted to go for 32s but i had a hard time finding what i wanted in that size. So far I'm happy with the driveability on pavement, when i do the YJ OME lift and 1" body lift I'm expecting it to be just right offroad too.

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post #11 of 11 Old 10-16-2021, 01:36 PM
80cj
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Quote:
Originally Posted by pg_jglr View Post
If you are looking for more of an engineering type look there are several sites that will help. I ran the numbers when planning my transmission / transfer case swap using these sites:

http://www.offroaders.com/info...cor...alculators.htm

http://www.grimmjeeper.com/gears.html

My drive train consists of: AMC 304 --> T-18 (1st @ 6.32) --> D300 (low @ 2.62) --> Stock axials from 81 CJ5 (HH code @ 3.73) --> 33" tires. I originally wanted to go for 32s but i had a hard time finding what i wanted in that size. So far I'm happy with the driveability on pavement, when i do the YJ OME lift and 1" body lift I'm expecting it to be just right offroad too.

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In looking at different M/T selections in 32's, I've also noticed that many manufacturers will list 31's and 33's but not 32's.
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