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Old 11-25-2007, 10:30 PM   #1
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lowering the TJ

I recently got my own jeep tj, im running dana 44 axles front and rear with 37 inch tires, so far I have yet to refine my driving before I hit the severe trails. im not sure how low I can go without clearance issues, the front fender has been opened up, and the rear looks to have been opened up some too.
The jeep has a 5.5 inch Rubicon express lift kit, can I just buy shorter springs to lower the jeep, or will that screw up my geometry?

I read that one should not go any bigger than 37 inch tires on the stock wheelbase due to it wanting to roll over backwards, is that due to the necessary lift needed to clear the tires? If i lower the jeep a few inches, do I need to worry about my tire size? also, the jeep has a yukon spool in the rear, am I likely to break a shaft just using it as a daily driver (small turning circle in a parking lot)?

Im pretty sure its a dana 44 in the rear, but to be sure are there any fool proof ways to identify an axle, im looking to buy a detroit locker, but need to know exactly what axle I have, and the spline #.

thank you
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Old 11-25-2007, 11:07 PM   #2
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Don't lower it, extend the wheelbase!

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Old 11-25-2007, 11:09 PM   #3
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I second that ^^^^^^
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Old 11-26-2007, 08:21 AM   #4
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while thats always good, a LCOG sure doesn't hurt. you can do a straight up swap to 4.5" springs...if you rub a little then adjust your bumpstops. Or you could add a 1" BL. same amount of lift but it doesn't change the COG near as much as suspension lift does.

i sure as heck hope that the axles are dana 44's with you running 37's.

rear dana 44= square metal fill plug on back side of diff
rear dana 35= rubber/plastic fill plug

now the dana 30 (front axle) has a square metal fill plug also so if you see that up front don't assume its a 44
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Old 11-26-2007, 09:51 AM   #5
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If you are indeed running 44's as you said then you will have 30 spline axle shafts. Unless they have already been upgraded, in which case they could have been beefed up to 33 spline. You will need to figure out if they are aftermarket shafts or not. Also, if you are running 37's on 5.5" of lift then I wouldnt go down any. You will rub when your flexing it all the way out. If you want to lower your cog then Id suggest going down to a 35" tire and then you can lower it onto some 4.5" springs. Otherwise, stretch it out to 106" or so. But even before you do that, build some dana 60's to run those 37's on before you find yourself up the creek without a paddle.
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Old 11-26-2007, 10:30 AM   #6
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i have 5.5" of lift adn 35's so i would not go any lower with that size tire, personally i would even give it a 1" BL

I have never heard of a jeep flipping over backwards ont he road, and if you mena while off raoding then you will have to just not pick those lines. As for teh spool you wont break a shaft instead you will sqeal your tires and they will wear down very quickly on pavement.
sounds to me like you need to take out that spool adn put in the detroit , and then leave everythign as it is

thats what i would do at least
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Old 11-26-2007, 01:25 PM   #7
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thanks for the info guys, the rear axle diff plug needs a square key, but the front needs a hex (it is a poison spider diff cover) are there any other ways to determine the front axle. The seller didn't mention anything about upgraded shafts in the axles, and im sure he would, considering that it is a upgrade that one really cant forget doing.

the jeep is a 98 tj, the other day i tried to fit my brothers 2000 tj doors on it and the latch loop did not line up with the door catch, is this normal for the difference in model years, or is something up with my jeep? i have some bestop element doors on the way and i want to know whether they will just bolt right up.
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Old 11-26-2007, 01:35 PM   #8
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hmmm, i think the doors should fit, but im not positive, to find out i would go to somewhere like quadratec.com adn see if they have differetn models for the differetn years. It could be that the PO went hardcore off orading and flexed the body a little.
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Old 11-26-2007, 04:18 PM   #9
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Post some pics up of the front end and we'll be able to tell you better what you have up there.
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Old 11-26-2007, 07:39 PM   #10
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ok, i wont be able to post pics until this weekend. my camera broke, and the new one doesn't arrive until later. also, the guy installed one of the rear lower links upside down (the zerk, is on the bottom of the link) im sure that will be ripped right off once it meets something. Is that a difficult thing to fix? Also on that link he missed the first washer that the bolt goes through that attaches the link to the chassis, so i guess i'll have to fix both problems at once.
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Old 11-26-2007, 08:10 PM   #11
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Quote:
Originally Posted by GrnTJ View Post
If you are indeed running 44's as you said then you will have 30 spline axle shafts. Unless they have already been upgraded, in which case they could have been beefed up to 33 spline. You will need to figure out if they are aftermarket shafts or not. Also, if you are running 37's on 5.5" of lift then I wouldnt go down any. You will rub when your flexing it all the way out. If you want to lower your cog then Id suggest going down to a 35" tire and then you can lower it onto some 4.5" springs. Otherwise, stretch it out to 106" or so. But even before you do that, build some dana 60's to run those 37's on before you find yourself up the creek without a paddle.
if he wants to lower the COG a little, he can buy a 1" BL and swap to 4.5" springs. lower COG but same amount of clearance.

btw, a local jeeper runs 2" springs, 1" BL and 35's...i recently saw a pic of him flexing his jeep on a 37 or 39" tire (no rub). point is, i think you can clear 37's with 4.5" of lift if you wanted too...of course you have to adjust some stuff.
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Old 11-26-2007, 09:13 PM   #12
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Our youth sure do crack me up...............
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Old 11-27-2007, 03:38 AM   #13
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Your just an old timer bluv
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Old 11-27-2007, 12:33 PM   #14
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Our youth sure do crack me up...............
thanks

i've never tried flexing on a tire...i sure do want to though! i may try it on my buddys YJ...
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Old 11-27-2007, 01:14 PM   #15
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I found that my front axle is at the very least, not a dana 30.
my brother has a stock jeep tj, and so I took a shoestring and wrapped it around the axle's circumference, and then to my axle, and my axle is larger than his.

are there any wheelers in carson/minden/gardnerville that would let a newbie join in on a trail run?

There is just one question I still have, that I still feel a little unsure of. Its already been answered by one guy, but i'd like to hear it from more people. That question is "will I break an axle shaft with the 37's and a spool on a high bite road when making a sharp and slow turn? i.e, in a high bite parking lot turning around in a small circle. id much rather have my tires churping than my shafts breaking.
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Old 11-27-2007, 02:02 PM   #16
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Just start on little trails dont go extreme until you are ready and always take a spotter with you. It won't take long untill you are wheeling like a champ.

as far as the axles are concerned you should be ok for a little while but I would think about putting a better set up in there for the long haul.
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Old 12-04-2007, 04:33 PM   #17
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well, finally got the camera. btw, I haven't been able to play with the settings yet so my jeeps color is off. It is bright red, not hot pink. I need another roll cage to body bolt (near the door latch) anyone know what size and thread that bolt is? also, the hose that leads into the transmission is leaking, what does it do? is it clutch fluid, or lubricant?

The bestop element upper doors don't fit in the element lower doors as well as one would expect, its not a tight fit, I can wobble the window when its in the holes. Do I need to get these things? http://www.4wd.com/productdetails.as...=0&partID=7538
also, my latches don't work all the time, the latches bend while im on the trail so that the pull bar wont fit through the hole, has anyone else had this problem?
i want to get a proper rear diff, but not sure which i need. will a lockrite locker act like the detroit soflocker, or like a spool? http://www.4wd.com/productdetails.as...00&partID=4922
not sure whether to get a detroit, or the lockrite(providing they behave the same)
which is more durable/suited to my jeep?

anyway, enough with the chat, here is the rig.


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Old 12-04-2007, 07:36 PM   #18
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Hmmm...wowah. Wait a sec. Correct me if im worng but is that a dynatrac D44 in his front end!? If thats the case than your pretty well off!
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Old 12-05-2007, 09:36 AM   #19
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nice rig...i would get a lockrite. if i recall correctly its similar to the aussie. actually, i may be thinking of the powertrax no slip.
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Old 12-05-2007, 11:41 AM   #20
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haha.
bigjeep,
the lockrite is much like the aussie. The aussie is a slightly more reliable design. Actually, the designer of the lockrite left the company and designed the Aussie, so it was an improvment on the original design. The powertrax on the other hand is a much higher quality locker than either of those two. I would not suggest getting a lockrite as there are countless horror stories I have heard. But the Aussie seems to be a good product for most people that use it. And everyone I have talked to about the powertrax has loved theres except that very rare case here and there where someone had a bad experience. Although powertrax apparently sent them a new one. Either way, if your going to do a lunchbox style locker than Id deff. go with a no slip.
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Old 12-05-2007, 12:59 PM   #21
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The thing is I have a spool in the back so I assume I don't have the diff carrier. Im thinking of getting the detroit soflocker. That is the one that pops apart on turns right? not the normally open one, correct? btw, that leak must be the clutch, the pig wont start today. I guess i'll have to attach the winch to the back of my bros jeep and have him tow me to the shop, could be interesting.
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Old 12-05-2007, 01:00 PM   #22
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the softlocker is not a selectable locker...so it will not normally be open.
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Old 12-05-2007, 01:03 PM   #23
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but it still allows different speeds in wheel rotation during turns on the street, right. the screeching that results from the spool is driving me crazy, let alone the extra ware on the tires.
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Old 12-05-2007, 01:05 PM   #24
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it will not be near as bad as a spool...the spool is fully locked all the time.
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Old 12-05-2007, 05:25 PM   #25
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Correct. An aussie will still give you that tire chirp a little bit and it will some times make a clicking kind of noise. That is the clutch packs inside the locker sliping over each other. It will allow the tires to spin more freely obvisiouly than a spool. Its a great alternative, especially to save your tires for a little longer. Plus its cheap. Compared to other lockers that is. They are only about $250. Good luck on whatever your choice may end up being. You got a nice rig there too!

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