post #1 of Old 10-22-2001, 03:42 PM Thread Starter
SFM1AE2
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Factory gear ratio for Dana35 in 87 YJ?

What is it cause I think I need 4.11 gears?


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post #2 of Old 10-22-2001, 03:55 PM
Wicked YJ
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If it is a 4 banger it has 3.73.
If it is a 6 banger it has 3.07

94 Red YJ
4" RE lift, 2" body lift, 4.10 gears, ford 8.8 in the rear, powertrax No-Slip in the rear, lockrite in the front, complete custom roll cage by Carolina rock shop, and corbeau seats and 5pt. harnesses, and of course herculined
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post #3 of Old 10-22-2001, 04:27 PM
Nightclaw
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I thought 4-cylinders all had 4.10:1, and 6-cylinders had either 3.07 or 3.55:1...?

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post #4 of Old 10-22-2001, 07:03 PM
NaeKid
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Actually ..

4cyl = 4.11 or 4.10 gears

6cyl = 3.07, 3.55, 3.73 gears

Mine, with tow package and all the extras has the 3.73 gears. My buddy that didn't have the tow package, but everything else has the 3.55 gears .. and another friend with the "cheap jeep" 6cyl has the 3.07 gears .. and he complains about it all the time!

If you look at the tag on the differential cover (if its still there), it will tell you which gears you have.

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post #5 of Old 10-22-2001, 08:53 PM Thread Starter
SFM1AE2
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So if my diff tag is no longer there how do I determine what my ratio is? What are the different options that rated different gear ratios?

87YJ I-6 Offenhauser intake Holley 4bbl MSD 6AL box
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post #6 of Old 10-23-2001, 03:56 AM
AJ
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'94 4.0 5spd... 3.73, and not enough for the 31's I'm running much less the 33's going on.

Chock your front wheels and place the back of your jeep on jack stands. Put the tranny in neutral and turn the rear driveshaft by hand, counting the number of turns it takes for 1 complete rotation of the tires. You'll see either about 3 1/2 ds turns = 3.55, a little past = 3.73. Or you could pull your diff cover, count the teeth on you r & P and do the math.
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post #7 of Old 12-13-2013, 01:50 PM
Kingston
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Whats a good everyday gear for daily driver use? I got 31" at tires n it pulls great, i just see alotta ppl useing a smaller gear but im assuming ppl are usein these for rock crawling since i see thats more popular up here
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post #8 of Old 12-13-2013, 03:59 PM
superj
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My 87 has 3.07, if I remember properly. It was fine when it had 31s on it. I have an auto and 6 cylinder

I don't feel like working on anything, at this time.
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post #9 of Old 12-13-2013, 04:00 PM
superj
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Oh ya, I have the top model for 87 so I have all the options and still have 3.07s so you can't go by model.

I don't feel like working on anything, at this time.
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post #10 of Old 12-13-2013, 04:10 PM
jeepguy85
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I got an 87 4.2 5 speed and 3.07s. I am going to 3.73s. I know, I know 4.10s are better. I like the 3.73 ratio. It makes me smile.

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post #11 of Old 12-13-2013, 04:43 PM
jserna
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My 87 had 3.55 stock, 5 spd
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post #12 of Old 12-13-2013, 07:12 PM
YJ4LIFE
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Quote:
Originally Posted by jserna View Post
My 87 had 3.55 stock, 5 spd
ditto with the '89. www.car-parts.com can tell you the gear ratio options of almost any car or truck

'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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post #13 of Old 12-13-2013, 07:36 PM
Kingston
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Is there a way to tell by the vin number?
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post #14 of Old 12-25-2013, 06:41 PM
jojojeep1
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all i6 jeeps come with 307s if it comes with auto tranny they get 355 gears.
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post #15 of Old 12-25-2013, 07:07 PM
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lots of bad information and wrong guesses in here but I bet the OP has figured it out over the last 12 years.

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