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Unread 08-13-2011, 08:32 AM   #1
calebrandal
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1991 YJ Wrangler 
 
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Bogging out in 4 high

Every time I try to use 4 high to climb even the smallest grade the engine boggs down and stalls. It doesn't do it in 4 low. Could it be a vacumn leak. I no longer have the vacumn actuated set up. Maybe the PO forgot to plug something? Any Ideas??

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Unread 08-13-2011, 12:12 PM   #2
srdart67
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I would start with checking for vaccuum leaks and if nothing check your transfer case linkage to make sure you are going all the way into gear.
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Unread 08-13-2011, 03:24 PM   #3
MJMPC
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What speed and RPM are you hitting the bottom of the hill?
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Unread 08-13-2011, 03:33 PM   #4
Xpress
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Does it do the same in 2wd?
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Unread 08-13-2011, 03:44 PM   #5
giggityjeeper
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maybe it just needs gears and it cant climb the hill in 4th..... vacuum leak would give ya grief all the time I would think.....

since the tire upgrade 4th and 5th are nonusable in mine pretty much till I get gears
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Unread 08-13-2011, 04:06 PM   #6
calebrandal
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does not stall in 2wd
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Unread 08-13-2011, 04:07 PM   #7
calebrandal
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usually pretty slow
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Unread 08-13-2011, 04:24 PM   #8
Xpress
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Might be something up with your vacuum disconnect system if it doesn't stall in 2wd. I'd say go through all of your vacuum connections going to the t-case, the vacuum switch on the t-case, and then the lines running to the shift motor. Either that or plug up the manifold vacuum that operates these and get a posi-lock system.
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Unread 08-13-2011, 04:28 PM   #9
giggityjeeper
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Quote:
Originally Posted by Xpress View Post
Might be something up with your vacuum disconnect system if it doesn't stall in 2wd. I'd say go through all of your vacuum connections going to the t-case, the vacuum switch on the t-case, and then the lines running to the shift motor. Either that or plug up the manifold vacuum that operates these and get a posi-lock system.
he dont have a vacuum system anymore..... Im guessing he has a posi...

im gonna go with it dont have enough power to turn the 4 tires in high range.... if its the vacuum it will do it all the time low range or high, you have a posi kit??... pull cable style?

off road, mine is LOW RANGE only, it wont turn my 33 in 2nd gear off raod let alone 4th.....


nothing really to unhook vacuum wise that would make your jeep run bad..... you need gears is my thinking, as it runs down the RPM, it will start to buck and stall out.......
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Unread 08-13-2011, 04:34 PM   #10
Alext13
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Not enough power in 4 high, to much strain on the drivetrain. Time to buy gears
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Unread 08-13-2011, 08:43 PM   #11
Bigboyky
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Whats the condition of your motor? With the 3:07's and 31" tires you should have power to wheel... Now me personally I don't use 4H for anything but on winter/snow covered roads. When I'm, off road it's 4L and I have 4:88 gears! If your're talking steep hill climbs or deep mud then you should use 4L. Just my opinion though
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Unread 08-16-2011, 06:26 PM   #12
calebrandal
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Quote:
Originally Posted by giggityjeeper View Post
he dont have a vacuum system anymore..... Im guessing he has a posi...

im gonna go with it dont have enough power to turn the 4 tires in high range.... if its the vacuum it will do it all the time low range or high, you have a posi kit??... pull cable style?

off road, mine is LOW RANGE only, it wont turn my 33 in 2nd gear off raod let alone 4th.....


nothing really to unhook vacuum wise that would make your jeep run bad..... you need gears is my thinking, as it runs down the RPM, it will start to buck and stall out.......
Yes, have posi-lock.
guess I'l check for vacuum leaks and use low. never had any problem in my S10 with 3.73's and 31's
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Unread 08-16-2011, 07:04 PM   #13
USMC3531
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Maybe I''m missing something but the 4 high has nothing to do with gear advantage, it's the same as 2 high, same gearing, just 4 wheel drive. You just need to downshift into a lower gear in high if the hill isn't too steep, or into 4 low for steeper hills. That will give you the gear torque multiplication to keep the motor from bogging.

I think your jeep has 4.10's stock, my 90 does. My little 2.5 with 31's will climb a wall in 4 low with no bogging.

Posi-lock has nothing to do with it, that just locks the halves of the front axles together, giving you 4 wheel drive. And even if your posi-lock wasn't working, that would just make your rear wheels spin, not bog the motor.
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Unread 08-16-2011, 07:30 PM   #14
calebrandal
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Quote:
Originally Posted by USMC3531 View Post
Maybe I''m missing something but the 4 high has nothing to do with gear advantage, it's the same as 2 high, same gearing, just 4 wheel drive. You just need to downshift into a lower gear in high if the hill isn't too steep, or into 4 low for steeper hills. That will give you the gear torque multiplication to keep the motor from bogging.

I think your jeep has 4.10's stock, my 90 does. My little 2.5 with 31's will climb a wall in 4 low with no bogging.

Posi-lock has nothing to do with it, that just locks the halves of the front axles together, giving you 4 wheel drive. And even if your posi-lock wasn't working, that would just make your rear wheels spin, not bog the motor.
it bogs out in 1st gear and 4 high.
not for certain, but you have 410 gears because you have a 2.5
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Unread 08-16-2011, 07:38 PM   #15
USMC3531
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Hm, I was missing something.... 1st gear in 4 high range is a different story, although my jeep starts bucking in that gear if the speed gets too low and I try to nurse it along with the clutch. It would die if I kept on in high range. Shifting into 4 low range lets me crawl along without the bucking. Yeah, 4.10's are stock with my 2.5.
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