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Unread 06-29-2013, 09:26 AM   #16
justinwatts8282
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1985 CJ7 
 
Join Date: Feb 2013
Location: fayetteville, NC
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speaking of gears for this axle i have the previous owner cant remember the gearing within the new axle what can i do besides pull the cover off and count the teeth to figure out what the gears are i have looked over the axle and i cant see any stamp or anything but it may be hidden i know there is a way to be able to jack it up and count the rotation of the drive shaft and the tire but not 100% sure on how to do that if you can inform me on how to do it properly it would be greatly appreciated.

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Unread 06-29-2013, 11:46 AM   #17
Spieg8
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1984 CJ8 
 
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Agreed that the 9" is a strong axle. It does have a couple of things about it that I don't care for (you cant just pop the cover like most axles, so you have to pull the axles and gear assembly every time you want to inspect the gears). Not sure why you're so concerned about the current gear ratio. Either it drives the way you want, or it doesn't. Should be the same ratio as the front axle... have you looked for a ratio label on the front? Counting teeth is probably your best option if you need to know exactly what's in there now (labels can be wrong).

If you want to change gears, I would use a calculator like this one to make your decision rather than basing it on your current gear setup.

http://www.grimmjeeper.com/gears.html
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Unread 06-29-2013, 11:58 AM   #18
LumpyGrits
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The ford 9" is the easiest of all to do a R&P change and to replace a pionion seal or bearing. 4 bolts on each axle tube and side the axle out 6", then remove the carrier bolts and put it on the bench and go to work. You don't even use shims to set the carrier ring gear up.
I can set up a 9" in have the time it takes for the others.
LG
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Unread 06-29-2013, 12:09 PM   #19
justinwatts8282
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im just currious for my knowledge of the jeep is why i want to know the gearing and i dont see any tags or stamps on the front or the rear axle but i do know the jeep will cruise at 60 mph at 2000 rpms in 5th gear and that is just fine with me but the tires are currently 31s and i want to run 33s im just currious as the the gearing so i can accuratly use the calculator to make sure i get the best performance and gas mileage that the jeep has to offer but i dont want to just pull the axle out and have to redo everything just to count teeth that was why i was asking if theres another way to get a rough idea of what is currently in the jeep im going to try and contact jeep to see if i can get the build sheet on it via the VIN but i was just asking if there was another way to judge what i had in there.
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Unread 06-29-2013, 12:17 PM   #20
LumpyGrits
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You want to know, because 2K rpm's at 60 is lug'n that engine. You want to be around 2500rpm, at a true 65mph. With my 4:88's and 33" BFG' I run about 2650 at a true ground speed of 65 mph confirmed via my GPS.
BTW, with those 31's, you ain't doing 60 mph, because the speedo is off now from the OEM size tires.
Use a GPS to confirm/prove what I say
With your 5 speed-You relly should look at 4:56 or better yet 4:88 R&P with 33's.
LG
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Unread 06-29-2013, 12:21 PM   #21
justinwatts8282
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hahah yeah thats why im trying to figure out the current gear
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Unread 06-29-2013, 01:20 PM   #22
jp360cj
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Easiest way to find it will be to pull the cover off the front axle and look at the outer edge of the ring gear. It will have either the ratio or tooth count stamped into it.
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77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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Unread 06-29-2013, 09:15 PM   #23
Spieg8
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Quote:
Originally Posted by jp360cj View Post
Easiest way to find it will be to pull the cover off the front axle and look at the outer edge of the ring gear. It will have either the ratio or tooth count stamped into it.
x2 (at least it will save you from pulling axles out of the rear)
0
Also agree with LumpyGrits about using GPS to determine accurate speed (PO may or may not have calibrated speedo for current setup, GPS will be true speed)
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Unread 06-30-2013, 11:32 AM   #24
justinwatts8282
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yeah ill just do that and see exactly where its at cus it may have the gears i need but im just watching the speedo not the gps but ill see what its at.
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Unread 08-23-2013, 09:07 PM   #25
row684
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Quote:
Originally Posted by justinwatts8282
yeah ill just do that and see exactly where its at cus it may have the gears i need but im just watching the speedo not the gps but ill see what its at.
Did you ever figure out what it was?
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