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Old 08-14-2010, 12:37 PM   #1
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5th Gear Bogdown

2004 TJ, 4" lift on 33". I noticed today on the highway that when i shift to 5th gear it actaully slows down to 60 miles per hour and will not let me go any faster. I took it to 70 in 4th and sure enough, as soon as I shifted to 5th and floored it the jeep actually slowed down gradually to 60 miles per hour. WTF! anyone know what causes this? Thanks.

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Old 08-14-2010, 12:47 PM   #2
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Originally Posted by sdbryant View Post
2004 TJ, 4" lift on 33". I noticed today on the highway that when i shift to 5th gear it actaully slows down to 60 miles per hour and will not let me go any faster. I took it to 70 in 4th and sure enough, as soon as I shifted to 5th and floored it the jeep actually slowed down gradually to 60 miles per hour. WTF! anyone know what causes this? Thanks.
You probably have 3.07 gears with your 33" tires. Did this recently start happening or was it after you got bigger tires.

I have 33's and 3.73 gears in my axles. I can still get going in 5th, it is slow but I can keep it up.

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Old 08-14-2010, 01:02 PM   #3
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I just boughit, already had the lift. Why can i get to 70+ if 4th but when i jump to 5th it takes it down to 60 only, even with the pedal to the floor.
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Old 08-14-2010, 01:13 PM   #4
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You have an electronic fuel injection system that only allows enough fuel into the engine that it can combust. Your gears are too high(or numerically low) and cause your overdrive gear to have too low of RPM's to generate enough torque to keep you going. Also the wind resistance at 70 is much greater than at 60 due to the bricks we are driving.
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Just bought a True Hi9 rear and a D44 front, both with ARB's and 4.88 gears!! Check out the build!
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Old 08-14-2010, 01:25 PM   #5
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I have the same problem i need to regear also. my friend has a jk on 35's with stock gears 5th and 6th are useless for him now.
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Old 08-14-2010, 02:31 PM   #6
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Thanks everyone. Thought I had a transmission prob, glad I dont. Last question, excuse my ignorance on this subject. Is it normal to be able to get to 70 - 75 in 4th gear but when I get to 5th gear it drops down to 60. I can understand needing to re-gear (I actually didnt think I had to that until I went up to 35" tires), but where I get confused on the subject is that if I needed to regear wouldnt 60 be as fast as I could get even in 4th?
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Old 08-14-2010, 02:45 PM   #7
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It's a matter of torque. You just don't have the torque necessary in 5th but have it in 4th. What are your RPM's when you shift into 5th? 4th gear is a direct drive, and your 5th is overdrive at a ratio of .78:1 requiring less RPMs for higher speed(originally for the 29" tires that it had stock).

Also if you have 3.07 gears then regearing should be in your imediate future. I have 3.73's and I still feel the need to gear up. Check your gears by looking on the axle cover for a plate at about the 10 o'clock position between two bolts. There you will find a number stating your gear ratio.

Edit: If your going to regear look at putting in 4.56, if you plan on getting 35" in the near future think about 4.88.
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Old 08-14-2010, 04:02 PM   #8
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My rear diff only reads Dana 43225. I shift @ 2500 rpm in 4th and am at about 70 mph. if I dont regear will it do damage even if I rarely need 5th gear?
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Old 08-14-2010, 04:51 PM   #9
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I have a 98 TJ, I had 3.07 gears with the same problem. I got some friends that do the rock crawling thing, they changed them out to 4.56. HOLY SHIT what a difference!!! I can actually get in traffic and drive this thing!! I have a 4.0 with 5 speed.
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Old 08-14-2010, 04:57 PM   #10
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I've got a 97' TJ and I have 4:10 gears and it does fine on the highway, besides shifting down to fourth on hills... 4 banger got to love... Not lol... I'll be throwing a i6 in there soon
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Old 08-14-2010, 06:51 PM   #11
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Quote:
Originally Posted by sdbryant View Post
2004 TJ, 4" lift on 33". I noticed today on the highway that when i shift to 5th gear it actaully slows down to 60 miles per hour and will not let me go any faster. I took it to 70 in 4th and sure enough, as soon as I shifted to 5th and floored it the jeep actually slowed down gradually to 60 miles per hour. WTF! anyone know what causes this? Thanks.
It's nothing more than your 33" tires were installed without also having regeared the axles to a lower ratio. To run 33" tires without it bogging down, you need to regear your axles to 4.56 which will increase your engine rpms slightly so to restore the performance lost because of the 33" tires.

It's not cheap to regear your axles, the cost is pretty close to $1100-1200 for both axle.

However, regearing your axles (both must be done) to 4.56 will totally restore your TJ's performance and you will be grinning at the much improved power afterward.
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Old 08-14-2010, 08:26 PM   #12
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It is in the rolling radius of the 33" tires.
Jeeps either came with 245/65/16 or a variation of that in tire size some were 15"s it takes more power and rotations to get a 33" to 50mph than a 31" tire. I have 15x10's with 32/11.50/15's and it seems to lug a bit in 5th but I never use 5th unless on the Interstate or a very flat road.
If you want to pick up some power downsize your tires!

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Old 08-15-2010, 07:05 AM   #13
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Thanks everyone for the useful information. Looks like its time to regear.

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