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Discussion Starter · #1 ·
I have a 97 jeep wrangler with a 4 cylinder that i just put a 4 inch lift and 33 inch Swampers on. It has 4.10 gears right now, but with the new big tires i dont know if the old gears would be enough. And with the anemic engine that the car has im doubly worried. Should i upgrade to 4.56, or even 4.88 gears? Or am i worrying for nothing?
 

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My dad has a 97 with 35's and same 4 banger. He has an atlas II but as I remember it he was running around 5.00 r/p. I can confirm that for you and let you know. It was enough to get around town and plenty of crawling power with the Atlas. I think he could do about 65 to 70 on the highway. I will find out.
Adam
 

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What do you do with it? If its your daily driver, Maybe give the stock gears a try for awhile. Switching gears is expensive. If you plan on running 35" in the future, maybe 4:88's might be a good idea.



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Discussion Starter · #4 ·
Yeah its a former daily driver now retired to 90% off-road use but i still wanna be able to drive it to town sometimes, and at least have the option of going on the highway if i want to but i dont think ill be doing much of that. :scared:
 

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Ok, I got the information on my dad's jeep. Here is a flow chart of his set up with four different r/p's.

1997 TJ
Transmission - AX-5
Transfer Case - Advance Adapters Atlas II - 4.3:1
Axles - Dynatrak, Dana 44's front and back. 5.89 ratio. ARB Lockers
Engine - AMC 150 I4
123 HP @ 5250
139 Lbs @ 3250

Final Drive Ratio
Rear End Ratio
Gear Gear Ratio 4.11 4.88 5.13 5.89
first 3.93 16.15 19.18 20.16 23.15
second 2.33 9.58 11.37 11.95 13.72
third 1.45 5.96 7.08 7.44 8.54
fourth 1 4.11 4.88 5.13 5.89
fifth 0.8 3.29 3.90 4.10 4.71


Final Drive Ratio (low range)
LOW Range 4.3 Rear End Ratio
Gear Gear Ratio 4.11 4.88 5.13 5.89
first 3.93 69.45 82.47 86.69 99.54
second 2.33 41.18 48.89 51.40 59.01
third 1.45 25.63 30.43 31.99 36.72
fourth 1 17.67 20.98 22.06 25.33
fifth 0.8 14.14 16.79 17.65 20.26


Tire Diameter 35 (28 inches standard)
Miles Per Hour 55
Engine RPM
Gear Gear Ratio 4.56 4.88 5.13 5.89
first 3.93 9462 10126 10645 12222
second 2.33 5610 6004 6311 7246
third 1.45 3491 3736 3928 4509
fourth 1 2408 2577 2709 3110
fifth 0.8 1926 2061 2167 2488

Tire Diameter 35 (28 inches standard)
Miles Per Hour 65
Engine RPM
Gear Gear Ratio 4.56 4.88 5.13 5.89
first 3.93 11183 11967 12580 14444
second 2.33 6630 7095 7459 8564
third 1.45 4126 4415 4642 5329
fourth 1 2845 3045 3201 3675
fifth 0.8 2276 2436 2561 2940

My dad has 5.89's on his. He says he can cruise at around 65 on the highway at just over 3000 rpm's.
 

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:scared: oh man, that is all jumbled. If you want I can send you the excel sheet this is created on.
Adam
 

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If you don't take it on the highway that much just put a 5.13 R&P in it or go as low as you can even with the 5.13s you will probably be able to run about 55-60 on the highway :rotfl:
 

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That chart is such a mess I went ahead and emailed you the excel sheet.
 
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