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Old 07-15-2014, 04:15 AM   #1
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Understanding lift and gears

Hey y'all, recently bought a 90 YJ and love it. Came with some lift on it but not sure what kind or exact size (would be about an inch if I had to guess). How do I figure out size and type?

Also, seems to be geared really low (can start from a stop in second), in third by twenty mph and about 1700 rpm, fourth by thirty mph. Assumed that it was just because 1) it was a jeep, and 2) it's almost 25 years old. Is there any visual marks to determine how its geared? And is there any sort of ratio of lift size to gears that I should be looking at?

Thanks for the help. Excited to learn more about my wrangler, it's really fun and interesting!

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Old 07-15-2014, 05:12 AM   #2
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4 or 6 cyl? Congrats on the purchase. I have a 90 also.

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Old 07-15-2014, 05:14 AM   #3
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Never mind. Prob a 6 after seeing that it's a Sahara . Looks good!
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Old 07-15-2014, 05:27 AM   #4
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Old 07-15-2014, 05:31 AM   #5
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It's a six
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Old 07-15-2014, 05:38 AM   #6
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The gears should be stock if you have stock axles and stock wheels and tires. Even with some lift. Unless for some reason the previous owner just wanted more torque. Some people change gearing when they get 33" tires, but most would change gearing when they get 35" tires or bigger. Then they are usually swapping out the stock axles for stronger ones and gearing the new axles to go with whatever tires they are running. Do you have any more pics of yours?
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Old 07-17-2014, 01:32 AM   #7
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Not on my new phone, but will take some in the morning
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Old 07-17-2014, 02:01 AM   #8
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This info is wrong! 6cyl manuals all came with 3.07 gears stock, 6cyl auto's came with 3.54 mostly with a few early 3.07's. 4cyl Manual/auto mostly came with 4.10. the way to know for sure is pull the diff cover off and look for the numbers on the ring gear. It will show numbers like 43 14 for a 3.07 or 41 10 for 4.10. 43 ring gear teeth and 14 pinion teeth is what these numbers mean

The reason autos come with lower gears is because a good amount of power is lost in the torque converter where a manual has the full power running through it.
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Old 07-17-2014, 07:59 AM   #9
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This info is wrong! 6cyl manuals all came with 3.07 gears stock, 6cyl auto's came with 3.54 mostly with a few early 3.07's. 4cyl Manual/auto mostly came with 4.10. the way to know for sure is pull the diff cover off and look for the numbers on the ring gear. It will show numbers like 43 14 for a 3.07 or 41 10 for 4.10. 43 ring gear teeth and 14 pinion teeth is what these numbers mean The reason autos come with lower gears is because a good amount of power is lost in the torque converter where a manual has the full power running through it.
Thanks, good to know!
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Old 07-17-2014, 08:01 AM   #10
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We need to tell whoever posted that chart before on WF... That where I found it.
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Old 07-17-2014, 12:34 PM   #11
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There are a few items on that chart that are correct.

Except for the 4.0 and the 4.2 gearing, those are way off.

You have to check the gearing yourself. The only proper way to do that is to drop the cover and look at the ring gear. The ratio is stamped into it.

And, lift has absolutely nothing to do with the gear ratio. It is tire size/ gear ratio that you should be concerned with. The proper gears with the size tires that you choose to run.
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Old 07-17-2014, 01:43 PM   #12
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How about the lift part of the question? I just finished reading other thread with the same question but I'm still confused about what to look for. My brain hurts. Can you give me a simple answer?
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Old 07-17-2014, 01:49 PM   #13
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You have to check the gearing yourself. The only proper way to do that is to drop the cover and look at the ring gear. The ratio is stamped into it.
That's what I already said, and it's not stamped with the ratio but the number of ring gear and pinion teeth for you to calculate the ratio. like 43 14 which you take 43 divided 14 =3.07
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Old 07-17-2014, 02:48 PM   #14
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How about the lift part of the question? I just finished reading other thread with the same question but I'm still confused about what to look for. My brain hurts. Can you give me a simple answer?
Telling lift height, tire size to gear ratio, tires for different lift size? If you want a simple answer, you have to ask a specific question?
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Old 07-17-2014, 07:45 PM   #15
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Are you sure you're not in Low Range? Those speed through the gears seem awfully low. 30mph in 4th and you're not bogging down? Something is wrong here.
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Old 07-17-2014, 08:27 PM   #16
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Are you sure you're not in Low Range? Those speed through the gears seem awfully low. 30mph in 4th and you're not bogging down? Something is wrong here.
I do 30 in 4th alot in town, it holds my revs at about 1100 for easy cruising. 3.07 gears and 31x10.5
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Old 07-17-2014, 09:04 PM   #17
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Are you sure you're not in Low Range? Those speed through the gears seem awfully low. 30mph in 4th and you're not bogging down? Something is wrong here.
The 4.2l does that. What do you think all that low end torque does
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Old 07-17-2014, 09:27 PM   #18
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The 4.2l does that. What do you think all that low end torque does
Yep I love the low end of my 4.2l. Stock gears and 35's it turns 2k Rpm at 70 But I am going to build a 29 spline 8.25 I'm getting for free to replace my d35 then it's getting 4.56's and lockers. Possibly a rear disk conversion from a kj also
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Old 07-18-2014, 08:38 AM   #19
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Okay... My specific question is how much lift in on my jeep? I'm wanting to get new tires (as you will see the tires on this jeep do not match what they should have), But I'd like to know how big of a tire I can go without having to do any or minimum mods.
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Old 07-18-2014, 09:02 AM   #20
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your springs look like stock, your shackles have been changed. measure from bolt to bolt, stock shackles are 4", 1/2 of the length over that is the amount of lift, i.e. 6" shackles would be 1" lift. you could run 31"s if you don't wheel hard.
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Old 07-18-2014, 02:09 PM   #21
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I agree with roadyrob, springs look stock, only lift is the shackles, and it looks minimal.

I wouldn't go above a 30x9.50x15 for a tire. The reason is because with those wheels, a 31 which is normally a 10.50 wide tire will rub the leaf springs when you turn. Unless you adjust the steering stops to prevent it, or buy different wheels with less backspacing. A 31 will, or should fit for height, but I doubt that it will fit because of the width.
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Old 07-18-2014, 05:25 PM   #22
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I was told it was 1 1/2"... But disappointed they only changed shackles...
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Old 07-18-2014, 08:54 PM   #23
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The reason autos come with lower gears is because a good amount of power is lost in the torque converter where a manual has the full power running through it.

I think You Have That 180 degs. OFF! They Run Higher Gears, You Gain Torque With a "Torque Converter" that's way they run 3.07s and not 3.54s.. or on an inline 4 they run 3.73s and not 4.10s, They Gain Torque! LOL
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Old 07-18-2014, 09:03 PM   #24
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I think You Have That 180 degs. OFF! They Run Higher Gears, You Gain Torque With a "Torque Converter" that's way they run 3.07s and not 3.54s.. or on an inline 4 they run 3.73s and not 4.10s, They Gain Torque! LOL
Im going to assume you're joking
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Old 07-18-2014, 09:36 PM   #25
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No I'm NOT JOKING AT ALL! Go To School and learn something, Off the start an Auto pulls higher RPMs = More Torque! I'm Not Joking, Why do you think a Pick Up with an Auto has a Higher Tow Rating that one with a Stick, In All Transmissions the Auto has the more Torque.
The Stick may be able to take more Heat, But it does not give more TQ. Get a small engine with a stick an try to pull a large Boat up the Ramp, LOL, Now do the same, with same engine and a Auto, Small test that we all should know.
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Old 07-18-2014, 11:50 PM   #26
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The reason autos come with lower gears is because a good amount of power is lost in the torque converter where a manual has the full power running through it.

I think You Have That 180 degs. OFF! They Run Higher Gears, You Gain Torque With a "Torque Converter" that's way they run 3.07s and not 3.54s.. or on an inline 4 they run 3.73s and not 4.10s, They Gain Torque! LOL
Now you're just full of crap, autos have the 3.54 gears and manuals have the 3.07. You need to go back to school and learn the 1st law of thermodynamics.

You cant create torque from nothing, the torque converter allows a good amount of engine slipping sort of like a clutch and that slip is moving the fluid around the tranny which also means that much of the engine's power is being turned into heat and then lost through the transmission. The reason autos seem like they have more torque is because the engine can be at higher rpms in the same speed range as a manual and autos are normally geared lower.
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Old 07-19-2014, 06:33 AM   #27
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I agree with roadyrob, springs look stock, only lift is the shackles, and it looks minimal. I wouldn't go above a 30x9.50x15 for a tire. The reason is because with those wheels, a 31 which is normally a 10.50 wide tire will rub the leaf springs when you turn. Unless you adjust the steering stops to prevent it, or buy different wheels with less backspacing. A 31 will, or should fit for height, but I doubt that it will fit because of the width.
I ran 30x9.5x15 on stock height. I have a slight rub at lock in one direction only. I have within the last year did .5" lift shackles similar to yours. The 30x9.5 on stock wheel is a good fit like stated above.
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Old 07-19-2014, 04:19 PM   #28
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Torque from nothing. Finally, perpetual motion...

Waiter, I'll have 3 torque converters please.

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