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  #25  
Old 03-21-2017, 04:46 PM
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Re: Newbie lift/tire questions

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Originally Posted by AmpLighter View Post
Not knowing my self but based on members suggestions I'd have to say that if one has the 3.21 gears a 2'' lift would the max. Unless one upgrades to either the 3.73. I'm assuming one could add an half an inch to an inch per gear ratio?

3.21 = stock - 2''
3.73 = 2'' - 3''
4.10 = 3'' - 4''

Lift height and gear ration have no correlation. By lifting higher it does allow you to fit a larger tire that does correlate to gear ratio. In theory you could lift a base sport with 29" tires and 3.21:1 gears as high as you want without doing anything else to it.


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  #26  
Old 03-21-2017, 05:07 PM
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Re: Newbie lift/tire questions

Lift has nothing to do with gears. If you want a 4" lift on a JK, do it but be prepared to add control arms, driveshafts, etc to correct the geometry that will need to be corrected.

Tire size has everything to do with gears. I have a chart for the 3.6L that shows optimum gear ratio for tire size.
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Old 03-21-2017, 05:43 PM
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Re: Newbie lift/tire questions

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Originally Posted by cranbiz View Post
Lift has nothing to do with gears. If you want a 4" lift on a JK, do it but be prepared to add control arms, driveshafts, etc to correct the geometry that will need to be corrected.



Tire size has everything to do with gears. I have a chart for the 3.6L that shows optimum gear ratio for tire size.


Your chart doesn't seem to specify, but IIRC that's engine rpm at 70mph.


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  #28  
Old 03-21-2017, 06:55 PM
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Re: Newbie lift/tire questions

ImageUploadedByJeepGarage1490140471.060617.jpg

Here's the one with the other information
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  #29  
Old 03-22-2017, 08:45 AM
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Re: Newbie lift/tire questions

Thanks, TL. I find this chart to be somewhat scary because I believe the standard Chief edition tires (LT255/75R17C BSW Off-Road tires on a 17" rim) are 32's (and just to prove my incompetence in this subject I confess I had to do a fair amount of internet research just to figure that out and am still not sure I have it right).

So for a manual transmission, your chart says that's the minimum allowable gear and that I should expect sluggish performance. Yay me!

Also, looks like I should never consider going above 34 - which is fine with me.
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Old 03-22-2017, 09:27 AM
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Re: Newbie lift/tire questions

Here's another question for those with the patience to continue to indulge me. Let's say I'm going to put a modest body lift on this (1.5 - 2"). Will the stock tires look OK with that or will they look too small?

Our goal is to beef the looks up just a bit, but not go overboard. I was thinking of doing that with both a lift and new wheels/tires. But now I'm wondering if the latter is necessary.

OTOH, I saw a wrangler around town the other day with a nice lift job (probably more than a couple of inches) and what looked like tiny tires to me. Maybe they were just a seasonal change for the snow, but it was laughable. I couldn't imagine paying $ for a nice jeep and then having it look like that. Wish I had taken a pic.
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Old 03-22-2017, 09:50 AM
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Re: Newbie lift/tire questions

Check out these two links... It will answer most of your questions.

Beginners guide to lifting your JK - Jeep Wrangler Forum

JK Tech common questions here!!!! - Jeep Wrangler Forum
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Old 03-22-2017, 09:54 AM
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Re: Newbie lift/tire questions

Not sure the increments on the body lift spacers.. but if there is an inch lift that might be acceptable.. more over a leveling kits would suit anyone wanting to get rid of the rake.. I think I seen some where a coil spacer would replace the factory spacer?.. or are they the same and can they be stacked?.. Not sure on the body lift and I think it would look silly if you did this without increasing the tire size, plus one is asking for trouble when taking sharp curves with a higher center of gravity.

Defiantly something to consider.. spacers on the wheels. spacers on the body and/or spacers or a hard coil lift all within specs.
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  #33  
Old 03-22-2017, 12:46 PM
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Re: Newbie lift/tire questions

I guess it would also be fair to ask what "sluggish performance" in the chart is referring to. I take it to refer to acceleration and/or rock climbing. I'm thinking road driving would be fine.
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Old 03-22-2017, 01:39 PM
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Re: Newbie lift/tire questions

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Originally Posted by pnwtoc View Post
I guess it would also be fair to ask what "sluggish performance" in the chart is referring to. I take it to refer to acceleration and/or rock climbing. I'm thinking road driving would be fine.
Actually, you will feel it more on the road than off. Especially on the highway running 70mph. In 4low, the transfer case helps out. On road, running 3.21 gears and 35s (315/70), you will be down shifting 1, sometimes 2 gears with the slightest hill and/or head wind. If you have additional weight in the Jeep, forget using your top gear.

This is a general rule of thumb:

3.6 engine:
1. 33' tires, the 4.10 Ratio.
2. 35" tires the 4.56 Ratio
3. 37" tires the 4.88 Ratio

3.8 engine:
1. 33" tires with Manual 4.56 Ratio.
2. 33" tires with Auto 4.88 Ratio.
2. 35" tires with Manual 4.88 Ratio.
3. 35" tires with Auto 5.13 Ratio.
4. 37" tires with Manual 5.13 Ratio.
5. 37" tires with Auto 5.38 Ratio.

I have 35s and 4.10s It does pretty good. You can feel it lose power on some hills and heavy head winds. It will even downshift a gear on longer/steeper grades. My buddy has 3.21s and 35s. He rarely uses 5th gear at all. (both autos)
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  #35  
Old 03-22-2017, 01:47 PM
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Re: Newbie lift/tire questions

The auto on 3.21 gears and 33"s would sometimes hunt for the right gear on the highway, doing the mountains on the interstate was really noticeable and I have a programmer to put the trans shift back where it belongs for the tire size. Off road, it wasn't bad. So yes, in some driving conditions I would call it sluggish. I'm dropping mine off this afternoon to have 4.56's installed, which will set me up for 35's down the road and I'll still be good with the 33's currently on it.
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Old 03-22-2017, 01:48 PM
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Re: Newbie lift/tire questions

You Go @Gotbru see I knew there was some sort of chart that those of us who aren't aware of these things, can actually read. Thx bunch
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