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Old February 16th, 2009, 06:48 PM   #1
wildbill4770
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Cool 4 cylinder build up

i want to run 33s on my yj but want to keep the 4 cylinder in it i just want to know if i put the correct gears in it will it perform as i does now nearly stock. also any ideas on the correct gearing etc.. thanks
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Old February 16th, 2009, 06:49 PM   #2
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you are an idiot for running a 4 cylinder er..... i guess i posted this oops sorry
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Old February 16th, 2009, 07:30 PM   #3
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I ran my 4cyl YJ with 33's, 35's and eventually 37's, it's all in the gearing.

With the original 4.10's and 33's it was a dog, driveable around town, but 5th was useless on anything other than a downhill run on the freeway with a tailwind.

The lowest gears you can put in the stock axles are 4.88:1, which wasn't low enough for me, so I swapped in a 44 front and 9" rear with 5.38's, which proved enjoyable to drive with the orignal 5-speed. I could even pass people on the freeway in 5th...until the 5-speed went boom. I swapped in an SM-420 4-speed and my crawling became effortless, but the lack of overdrive made freeway travel challenging, nothing like 4500rpm just to keep up in the slow lane, but I had plenty of power.

Even with 35's, the 4cyl still got the job done, especially after I switched to a 4.0L throttle body. I did end up re-building the 4cyl after it slushed-over during and winter trailride/campout and blew a head gasket. The additional power from the Mopar cam and extensive head work really helped for high-rpm stuff, but the factory ignition and rev-limiter never really let the "little-mill that could" show it's stuff. I stopped driving it on the street before I went to 37's, so I don't really know how it behaved, but I would suspect it was probably more tolerable, it still had plenty of low end.

I also installed a flywheel weight shortly after going to 35's, it hurt my low-end acceleration, but it could idle up a tree until it flipped over.

Good luck
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Old February 16th, 2009, 07:30 PM   #4
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5:13 gears will greatly help 4:88 would also help out You already have 4:10's in it Buy some 5:13's and put the old 4:10's up for sale.
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Old February 16th, 2009, 07:37 PM   #5
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i have the same motor it has some balls for a 4 cylinder its nearing the end of its life though and i am looking to change it out for a cummins 4bt with an ax 15 tranny if anyone knows where to find a 4bt i would appreciate it thanks.
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Old February 17th, 2009, 08:26 AM   #6
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I would google Gear ratio chart... You will find a lot of resources like this: http://www.4lo.com/calc/geartable.htm

If you are in the need for some new gears, or want to look at other options, PM Ironman. He is located in Midland and can make or get anything that you need.
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Old February 17th, 2009, 04:04 PM   #7
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Thanks for the info i know little about axles so any info is appreciated. i don't want to put different axles into it so hopefully 4.88 gears will work if not maybe i will have to stick to a smaller tire thanks
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Old February 17th, 2009, 05:06 PM   #8
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Quote:
Originally Posted by wildbill4770 View Post
Thanks for the info i know little about axles so any info is appreciated. i don't want to put different axles into it so hopefully 4.88 gears will work if not maybe i will have to stick to a smaller tire thanks
I would think that 4.88 would be Ok, but I am pretty new to the sport. I would contact Pat (Ironman - www.ironmanoffroad.com). He has quite a bit of experiance and can point you in a good direction that will work for what you want to do with the Jeep.



BTW - if you ever need a hand wrenching, let me know, I am just down the road.
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Old February 17th, 2009, 05:57 PM   #9
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i have a 93 yj with a 4 cyl. i am running 36"tsl with 4.88 gears it does pretty good except for deep snow and sand hill climbs, 2nd low is too low and 1st high and 3rd low is too high, so you run around in 2nd low and let the valves float
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Old February 17th, 2009, 06:11 PM   #10
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i was looking at the gear ratio chart that u sent me tweak and with stock 4.10 gears and 32 inch tires it should put me right in the middle 2805 rpm at 65 mph that is assuming my 5 speed has a 1:1 ratio in fifth which i think it does. i don't plan on this being an extreme offroader so i wonder if stock gears would be ok
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Old February 18th, 2009, 11:18 PM   #11
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I just test drove my YJ the other day. I have 33x14.50x15 tires and a RE SOA lift with stock axles 4:10s. On I-69 I was running 68-70 mph in fourth gear at about 2800-3000 RPMs. 5th gear is useless, It just wont hold it with this set up. That is ok with me because 70 is fine. Thought this would help you out a bit.
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Old February 18th, 2009, 11:31 PM   #12
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i had 5.89's and 38's that measured 37 inch and i still could not use 5th gear.........

go huge gearing if you can, i think 5.89's and 35's would have been perfect for me, the added rolling resistance makes a large difference when you have 100ft lbs of torque
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Old February 19th, 2009, 10:49 AM   #13
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I'm running 4.88's and 35's and a lot of weight from armor and such....it runs nearly as well as it did when I had the stock 4.10's and 31's....and I drive it on the highway nearly everyday using 5th gear reaching speeds around 75 mph.

Go to 5.13's if you can afford the axle swap. I went with 4.88's because it was close enough to what I was used to and I plan on swapping in a V8...some day....
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Old February 19th, 2009, 03:53 PM   #14
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thanks for the info i am not ready for new gears yet so i might just stick some 31's under it till i am ready
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Old February 19th, 2009, 05:01 PM   #15
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...that is assuming my 5 speed has a 1:1 ratio in fifth which i think it does...

4th gear is 1:1, 5th is more like 0.75:1, that's why it's called OVERDRIVE.

Stock gears are "okay" for up to 33's, but expect some loss of performance and freeway driveability.

If you don't feel you'll ever need to upgrade axles due to your offroad driving style, then re-gear to 4.88:1 when you can afford it, that will keep your performance for up to 35's without a huge expense.
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Old February 19th, 2009, 05:39 PM   #16
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Its 0.81 in that trans, I believe. I would go with 4.88s with either 33s or 35s. Above that, you'll really start struggling with anything that you need power/wheelspin.

I ran 4.88s with 38.5s, but couldn't really go above 55 mph. Crawled fine (100:1 gearing).
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