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Old 03-28-2012, 09:26 AM   #1
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AxL questions!

K so it looks to be that: I have a Dana 44 rear and a 35 front, my jeep is a 2000 TJ sahara with a 6.5 lift running 35s so the question I have (newb to gearing) how do I tell if the PO had it re geared ?? Thanks for the help!

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Old 03-28-2012, 09:52 AM   #2
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K so it looks to be that: I have a Dana 44 rear and a 35 front, my jeep is a 2000 TJ sahara with a 6.5 lift running 35s so the question I have (newb to gearing) how do I tell if the PO had it re geared ?? Thanks for the help!
MOst of the time the new gear ratios are indicated on the little alluminium plate mounted on the differential cover.

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Old 03-28-2012, 10:02 AM   #3
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Quote:
Originally Posted by Rolf

MOst of the time the new gear ratios are indicated on the little alluminium plate mounted on the differential cover.
No plate but my speedo is 6mph off (-) of what my GPS says
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Old 03-28-2012, 10:08 AM   #4
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Turn your tire and count how many times you have to rotate a tire to turn over the drive shaft once. That will tell you roughly where you are geared.
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Old 03-28-2012, 10:13 AM   #5
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Turn your tire and count how many times you have to rotate a tire to turn over the drive shaft once. That will tell you roughly where you are geared.
Wouldnt it be the other way around? Count how many turns in the driveshaft to turn the tire once?

and to the OP, you have a D30 front, not a D35 .
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Old 03-28-2012, 10:19 AM   #6
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Quote:
Originally Posted by Cons_Table

Wouldnt it be the other way around? Count how many turns in the driveshaft to turn the tire once?

and to the OP, you have a D30 front, not a D35 .
^This

And your tire size affects the speedometers as well.
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Old 03-28-2012, 10:24 AM   #7
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[QUOTE="Cons_Table"]

Wouldnt it be the other way around? Count how many turns in the driveshaft to turn the tire once?

and to the OP%2
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Old 03-28-2012, 10:39 AM   #8
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Ok cool so do you mark the tire, also will u spin one or both?
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Old 03-28-2012, 10:43 AM   #9
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Most Jeep TJ's have a Dana 30 front axle, except Rubicon which comes with a Dana 44, so a 35 in the front would be odd. The tag on the axle housing / differential cover (if the tag is even there) would tell you what gear ratio it came with the from the factory. If you think the gears have been changed you can find out with just a floor jack. If you have an open differential (no locker), chock the front tires & jack up 1 rear tire, mark the tire & drive shaft, spin the tire 2 complete revolutions & count the number of revolutions of the drive shaft. If the drive shaft spins a little more than 3 times, that would mean 3.07. Close to 4 revs but not quite = 3.73, 4 & a hafl revs = 4.56, etc.
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Old 03-28-2012, 10:44 AM   #10
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Quote:
Originally Posted by Cons_Table

Wouldnt it be the other way around? Count how many turns in the driveshaft to turn the tire once?

and to the OP, you have a D30 front, not a D35 .
Yep, sorry, had it backwards.
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Old 03-28-2012, 10:45 AM   #11
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Ok cool so do you mark the tire, also will u spin one or both?
Ya if you just put the rear axle on stands, both tires will spin. Just make a mark on the tire with chalk or something, and then spin the drive shaft until the mark makes its way back to its start location.
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Old 03-28-2012, 10:47 AM   #12
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Most Jeep TJ's have a Dana 30 front axle, except Rubicon which comes with a Dana 44, so a 35 in the front would be odd. The tag on the axle housing / differential cover (if the tag is even there) would tell you what gear ratio it came with the from the factory. If you think the gears have been changed you can find out with just a floor jack. If you have an open differential (no locker), chock the front tires & jack up 1 rear tire, mark the tire & drive shaft, spin the tire 2 complete revolutions & count the number of revolutions of the drive shaft. If the drive shaft spins a little more than 3 times, that would mean 3.07. Close to 4 revs but not quite = 3.73, 4 & a hafl revs = 4.56, etc.
If you spin the tire for 2 revolutions, you are gonna be looking at 6-9 spins of the drive shaft...
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Old 03-28-2012, 10:51 AM   #13
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Transmission needs to be in neutral of course, lol
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Old 03-28-2012, 10:54 AM   #14
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Edit: damn iPhone just read the entire thread thanks all
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Old 03-28-2012, 10:57 AM   #15
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Ok sounds simple enough but a few more questions should I mark it somewhere? And also both tires jacked up? And front or back? ::
Yes, mark the tire...you need to be able to see when it has made its full rotation. You can jack up one tire IF you are open or have selectable lockers. LSD or autolockers, you will need to jack up both tires. The back would be easier to deal with.
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Old 03-28-2012, 10:58 AM   #16
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With only 1 axle turning you have to make 2 revolutions to spin the ring gear 1 revolution because of the 2-1 ratio between the spiders and side gears.
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Old 03-28-2012, 05:54 PM   #17
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hartattack, did you find out what gear ratio you have?
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Old 03-28-2012, 10:29 PM   #18
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Quote:
Originally Posted by 50Johnbob
hartattack, did you find out what gear ratio you have?
Not yet had a friends b-day dinner to get to, I'll check out and post pics this weekend around Sunday and I'll post thanks for all the help
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Old 03-28-2012, 10:46 PM   #19
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With only 1 axle turning you have to make 2 revolutions to spin the ring gear 1 revolution because of the 2-1 ratio between the spiders and side gears.
That's not how it works.
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Old 03-28-2012, 10:54 PM   #20
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Quote:
Originally Posted by freeskier

That's not how it works.
By all means share dude
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Old 03-28-2012, 11:15 PM   #21
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The spider gears and side gears do not share a gear ratio relationship. I really don't know how to explain it. The best I can do is show you this video and watch very carefully the relationship of the spider gears and side gears.

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Old 03-29-2012, 12:09 AM   #22
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Quote:
Originally Posted by freeskier
The spider gears and side gears do not share a gear ratio relationship. I really don't know how to explain it. The best I can do is show you this video and watch very carefully the relationship of the spider gears and side gears.

Great vid !
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Old 03-29-2012, 07:23 PM   #23
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For a locked or LSD-equipped axle, it takes one revolution of one tire to spin the driveshaft the number of revolutions to equal the ratio.

But with an open axle, it takes rotating a tire two revolutions to rotate the driveshaft the number of revolutions to equal the ratio.

Note step 5 at http://www.ehow.com/how_12156231_cal...ear-wheel.html and also note the Tips & Warnings at the end that talk about rotating it just one revolution for locker or LSD equipped axles.
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Old 03-29-2012, 07:47 PM   #24
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Thanks jerry can't wait for sunday
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Old 03-30-2012, 12:09 AM   #25
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Thank you Jerry for your post & the link. I tried to find an example on the web that would explain or verify the method I posted earlier. I'm glad you were able to find one.
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Old 03-30-2012, 06:02 AM   #26
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your tire size or gear size will affect your speedo your best bet is to see what gears you have in it and get you a new speedo gear to correct your speedometer for your gear and tire size
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Old 03-30-2012, 09:38 AM   #27
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Quote:
Originally Posted by Jerry Bransford
For a locked or LSD-equipped axle, it takes one revolution of one tire to spin the driveshaft the number of revolutions to equal the ratio.

But with an open axle, it takes rotating a tire two revolutions to rotate the driveshaft the number of revolutions to equal the ratio.

Note step 5 at http://www.ehow.com/how_12156231_cal...ear-wheel.html and also note the Tips & Warnings at the end that talk about rotating it just one revolution for locker or LSD equipped axles.
So i def don't have an LSD or lockers unless the PO hid the switch still searching ha ha so I'll just do the two spins, one more question what if I open the diff and take a picture? I needed to do a drain and fill anyways. Would any of you be able to tell?
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Old 03-30-2012, 09:41 AM   #28
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Too much crap, just pop the cover and look at the numbers on the ring gear....the oil prolly needs to be changed anyway
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Old 03-30-2012, 09:42 AM   #29
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We can tell if it's open or not if your picture is good enough.
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Old 03-30-2012, 09:46 AM   #30
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Quote:
Originally Posted by Ibuildembig
Too much crap, just pop the cover and look at the numbers on the ring gear....the oil prolly needs to be changed anyway
I've had great experiences with royal purple syncromax for the tranny but never tried it with diff have any of you? Or can you? Like I said super newb when it comes to axels ha ha

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