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Old 06-19-2014, 11:16 AM
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5th gear speed loss?

Hey guys I have a 2000 TJ Sport with a lift kit. I'll be driving at highway speeds(55-65) on straight stretches, sometimes even going downhill, and when I shift into 5th I lose pretty much all power and speed even with the pedal all the way to the floor. Is this normal or should I get it looked at?

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Old 06-19-2014, 11:24 AM   #2
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35" tires and what axle ratio? If you haven't regeared your axles to a ratio that is appropriate to that size tire, your engine can't develop enough power to turn them.

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Old 06-19-2014, 11:28 AM
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I'm not entirely sure on the ratio. I'll have to jack it up and put it on stands and see..that would make sense for some mpg loss.
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Old 06-19-2014, 11:32 AM   #4
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5th gear is pretty much like over drive, never used it.
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Old 06-19-2014, 11:43 AM   #5
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The axle ratio is stamped into a steel tag bolted onto the differential cover at its 9 o'clock position. Like "3 73" means a 3.73 ratio.

Regardless of the existing axle ratio, regearing to 4.88 is the fix that will restore the power.
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Old 06-19-2014, 11:48 AM
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Then they're 3.73. Would that be the appropriate gearing for 35s with a 5 - 6inch lift?
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Old 06-19-2014, 11:51 AM   #7
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4.88 is the appropriate ratio for 35's. Lift height has nothing to do with it.
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Old 06-19-2014, 12:01 PM
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Okay cool thanks a lot! I'll look into it
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Old 06-19-2014, 03:50 PM   #9
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What's the appropriate ratio for 33x12.5?
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Old 06-19-2014, 04:00 PM
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I've been reading a lot and either 4.56 or 4.88 for 33". From what I've read most people prefer 4.56 with 33" tires and 4.88 for 35" tires.
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Old 06-19-2014, 05:01 PM   #11
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Quote:
Originally Posted by NoBoat0429 View Post
5th gear is pretty much like over drive, never used it.
5th gear IS overdrive and with your tire and gear combo why wouldn't you use it?
Edit re read your post I see you were not talking your ride
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Old 06-19-2014, 09:08 PM   #12
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Quote:
Originally Posted by bhayden14 View Post
I've been reading a lot and either 4.56 or 4.88 for 33". From what I've read most people prefer 4.56 with 33" tires and 4.88 for 35" tires.
Quote:
Originally Posted by BigBull Gator View Post
What's the appropriate ratio for 33x12.5?
That all depends on the engine and transmission type. What are you running? That could be anything from 4.10 to 4.88 depending on what engine and transmission you're running.

For example with the 4.0L engine and 33" tires.
3-speed 32RH automatic transmission: 4.10
4-speed 42RLE automatic transmission: 4.88
5-speed manual transmission: 4.56
6-speed manual transmission: 4.56 or 4.88 depending on highway vs. offroad mix.
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Old 06-20-2014, 04:05 PM   #13
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Thank you. I have a 4.0 I6 w/ 5 spd manual. Much appreciated!
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Old 06-20-2014, 04:21 PM
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^X2 thanks a lot man! I really appreciate it.
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Old 06-20-2014, 05:12 PM   #15
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I have 35x12.50s and just did 4.56 with my 5 speed. Pretty much returns it to stock power and puts the gas mileage back where it was.

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