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Old 03-26-2013, 08:24 AM   #1
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Bogging down and new LSD

Okay, I am new to this online posting stuff, I have always just tried to figure everything out on my own. I have now come to realize that is a very stupid idea, and there are plenty of jeep guys that are full of useful information. With that being said, I have a 97 tj 4.0 manual. It has 33"s lifted and some pretty heavy duty bumpers on it. When I am running through some mud, nothing too deep, the jeep is going but then obviously starts to bogg down. It will do it even in deeper puddles when it rains. I was wondering if this is because I have not re-greared since the taller tires. Would the stock gearing contribute to the problem? My next question was that I also wanted to install a limited slip diff. The jeep is not my daily driver but I don't want to get too crazy with it. Anyway, I was wondering if it would be okay if I just installed the LSD in the rear or would it be better to install it in the front,or at all for that matter. Any help with this would be greatly appreciated.

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Old 03-26-2013, 11:55 AM   #2
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If you dont know the gearing, you might want to find out. Gearing will help, but bogging down could also be something engine related. Have you pulled the plugs and checked the fuel filters?

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Old 03-26-2013, 11:58 AM   #3
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Also, by bogging down do you mean like you are trying to make the engine work harder but it seems like its just not got any power? Or is it a constant sluggish feeling?
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Old 03-26-2013, 01:09 PM   #4
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Okay, you need to find out what your stock gearing is. Also, what is your back axle? And what exactly do you mean by bogging down? And by mud puddles how deep are we talking? When going through mud, your tires will gunk up causing them to spin thus lack of traction causing the vehicle to sink. (Especially in South TN and North GA mud) Which is what "bogging down" means, atleast in my neck of the woods

Now on to the LSD, if you have a 44 in the rear, chances are you already have one. If not, just put in a selectable locker in the front or rear. (I prefer front) Don't waste your money, you'll thank yourself later.
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Old 03-26-2013, 11:26 PM   #5
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I have a 3.07 stock gear ratio and a Dana 35c in the rear. I do want to step up the gearing into a 4.10, do you think that may help the situation? As far as the stuff I am going through it is nothing too special and the obstacles are not too deep, maybe eight inches or so. I know I don’t have an LSD already though. Anyway, I know everyone holds selectable lockers in such high regard but I want something that is not going to put too much stress on the parts. But one question is; what is the benefit of installing a LSD or locker in the front over the rear? Any info would be greatly appreciated.
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Old 03-26-2013, 11:28 PM   #6
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Quote:
Originally Posted by CoreyZ View Post
Also, by bogging down do you mean like you are trying to make the engine work harder but it seems like its just not got any power? Or is it a constant sluggish feeling?
First off thanks for the response, I really do appreciate it. Anyway, when I say bogging down what I mean is that when I get in the mud or water I am stepping down on the gas and then everything starts to slow down and even though my jeep is floored the RPM’s begin to drop and it gets to the point where it starts to sputter. The jeep is not constantly sluggish though. When I am running on dry stuff it still has some get-up an go. I live in NC, but I am new to the area and don’t know how the mud effects how well the jeep drives in it.
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Old 03-26-2013, 11:29 PM   #7
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Originally Posted by ThatWhiteMachine101 View Post
Okay, you need to find out what your stock gearing is. Also, what is your back axle? And what exactly do you mean by bogging down? And by mud puddles how deep are we talking? When going through mud, your tires will gunk up causing them to spin thus lack of traction causing the vehicle to sink. (Especially in South TN and North GA mud) Which is what "bogging down" means, atleast in my neck of the woods

Now on to the LSD, if you have a 44 in the rear, chances are you already have one. If not, just put in a selectable locker in the front or rear. (I prefer front) Don't waste your money, you'll thank yourself later.
I have a 3.07 stock gear ratio and a Dana 35c in the rear. I do want to step up the gearing into a 4.10, do you think that may help the situation? As far as the stuff I am going through it is nothing too special and the obstacles are not too deep, maybe eight inches or so. I know I don’t have an LSD already though. Anyway, I know everyone holds selectable lockers in such high regard but I want something that is not going to put too much stress on the parts. But one question is; what is the benefit of installing a LSD or locker in the front over the rear? Any info would be greatly appreciated.
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Old 03-27-2013, 03:39 AM   #8
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Does is still bog down in say 1st Gear and/or while in 4-Low? If so, there is something wrong with either your engine or drive train. Possible transfer case power loss issue but I've never heard of this happening before. Id take it to an offroad (or any) shop and get it inspected. Could be something simple like a vacuum leak, clogged throttle body, or air intake (I found a birds next in mine once)

Also, if your getting a LSD, put it in the rear, this will also help the on road drive ability all round. But for a selectable locker, put it in the front. Don't waste your money locking a D35. They're inferior axles and cost more than 500$ to do correctly and (somewhat) reliably. It's a very weak axle and building it up is not an option. If you ever decide to go bigger in tires or how hard you wheel, find a Dana 44 for the rear.

Below is some links to help you, these guys have alot more knowledge than I and can point you in the right direction.

Here's a link for the lockers
http://www.jeepforum.com/forum/f9/sh...r-axle-911143/

Here's a link for the LSD
http://www.jeepforum.com/forum/f9/ax...35-lsd-137080/

And finally for your engine (not sure if this applies)
http://www.jeepforum.com/forum/f9/my...power-1374324/

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