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Old 03-10-2018, 12:38 AM
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Question for Regearing my YJ

I have a 91 YJ (manual)with 36's on it that I have recently purchased (First Jeep)
Been slowly looking into fixing several small things the previous owners didn't do. The told me the engine was swapped from 4cyl 2.5 (stock engine) to inline 6 from a 95 wrangler. I believe they never changed the gear ratio when they put on the bigger tires as it feels like it loses a lot of power trying to hit highway speeds. I was wondering as to what gear ratio I should be running if I keep the 36's on it.

Side note I had someone tell me I should put smaller tires on it if I want to do abit of offroading and not change lift (recommended I run 32's or smaller) if I ran 32's what kind of ratio should I run?

I want this to be mostly street driving but leave the option open for offroading

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Old 03-10-2018, 06:31 AM   #2
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For mostly st driving I would go with 33s and 4.11s anything over 33s I would look at 4.56s.... Good Luck!

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Old 03-10-2018, 07:34 AM   #3
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Most 33" tires actually measure somewhere near 32" when loaded. If you have enough lift to fit 36" tires, I'm guessing you have way more lift than you'll need for 33" tires... something to consider would be removing some of the lift (if possible) or new springs in the future. Not a requirement, but with possibly 6" of lift on a 32-33" tire, you'll look like you skipped leg day and be unnecessarily tall.

That being said, 33" tires do well with 4.88 gears in a 5-speed application, especially in hilly or mountainous terrain, or if you do a lot of slow, technical trails. If you're mostly trail riding or highway driving, 4.56 gears are a good compromise, though 4.11's are usable for many (though not as friendly when wheeling slow). I'm running 4.88 gears now with 33" Duratracs (measure 32" diameter when loaded) and am happy with the performance on and off-road, including highway driving at 75 MPH.

I just built a set of Dana 44's and although my plan is to go with 35" tires, I kept the 4.88 gears since the 35" tires I'm looking at (BFG's) are notoriously undersized (typically measure 33.4-33.8").
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Old 03-10-2018, 01:06 PM   #4
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My 4.0 95 yj has 4.10's w 33's... for trails city driving and most hwy driving is is great.... when I'm in 80 mph traffic w a little wind I occasionally have to kick off the cruise and downshift to maintain speed on a hill or overpass..... If you don't do much interstate driving you'll probably be very happy w 4.10's

That said 4.10 would be the stock ratio for a 4cyl 5 speed so maybe you should figure out what you have now before going any further.
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Old 03-11-2018, 03:30 PM
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I appreciate all the advice and feedback. I plan to verify the gear ratio and actual tire size this week. This definitely helps me feel a lot less lost and more confident going forward.
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