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Unread 06-21-2011, 08:20 PM   #1
CK3
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Join Date: Sep 2010
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Highway Help ('00 TJ, 2.5 / Auto Trans)

So I have a 2000 TJ with a 2.5 & a 3 speed auto..(yea, yea, I know....) I'm running 32x11.5x15 ProComps.. The highway is KILLING me!!! 55/60 mph @ 3500/3700 rpm (with a headwind.... forget it!!) The real annoying thing is that the trans shifts non-stop between 2nd & 3rd constantly at 55/60 with the slightest incline in the road. Normal road driving is great... I just can't hit the highway...




Short of swapping in a 5-speed, doing a motor/trans swap or putting the stock wheels & tires back on... Is there anything I can do to enjoy driving this thing on the highway? My God please dont tell me to put lower gears in it.. lol.. with the 2.5L it would be faster to walk to work..

Thanks,
Bear

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Unread 06-21-2011, 09:26 PM   #2
TheDodson
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Quote:
Originally Posted by CK3 View Post
My God please dont tell me to put lower gears in it.. lol.. with the 2.5L it would be faster to walk to work..

Thanks,
Bear
Put lower gears in. Only thing that will recoup the power loss. Your rig won't get slower by lowering gears it will actually get faster.
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Unread 06-21-2011, 09:31 PM   #3
LilyBayXJ
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Are you seriously running 3700 RPM at 60 mph? My 2.5 with the 5-speed runs about 2800 RPM at that speed, with 31's.
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Unread 06-21-2011, 09:38 PM   #4
CK3
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Originally Posted by TheDodson View Post
Put lower gears in. Only thing that will recoup the power loss. Your rig won't get slower by lowering gears it will actually get faster.
I meant slower acceleration with lower gears. The ole 2.5 isnt a rocket with the current gearing..
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Unread 06-21-2011, 09:41 PM   #5
CK3
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Originally Posted by LilyBayXJ View Post
Are you seriously running 3700 RPM at 60 mph? My 2.5 with the 5-speed runs about 2800 RPM at that speed, with 31's.
Yep... with stock wheels all is good.
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Unread 06-21-2011, 09:52 PM   #6
rcman1993
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lower gearing as in going from 4.11 to 3.73, or going 4.11 to 4.56 gearing, if you have the 4.11 gears, then if you get 4.56 gears, then your acceleration and rpm will increase but the 2nd to 3rd gear constant shifting will go away cause of the increase in power. i highly doubt that you are in 3rd gear with 32's and stock gears going 60 at 3xxx rpm, it should be like under 3xxx rpm. did you change the speedo gear with the new set of tires and have you had the transmission checked out? it might be slipping a little or your going like 80mph. very possible its that your going 80mph. in my jeep, i cant tell the difference between 60 and 80mph, im still holding on for my life.
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