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Old 12-01-2012, 02:13 PM   #1
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97 wrangler sahara decelerates when u gun it in 5th gear

Hello all!!! ruby here. I look forward to being apart of this community and learning lots about jeeps. ok heres whats up. When in 5th gear doing 55-60 if u ease the gas nice and easy u can get up to 70mph but no more but if u gun it at the same speed and gear it decelerates. Thank you soooo much for ur replies!!!!!!!!

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Old 12-01-2012, 02:14 PM   #2
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I hope this is in the correct forum.

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Old 12-01-2012, 02:19 PM   #3
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So if you step down aggressively on the gas pedal it slows down but if you slowly step down on the gas it will accelerate?

And 70 mph is tops?

What size tires? And do you know your axle ratio?
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Old 12-01-2012, 02:33 PM   #4
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Yes that correct. There over sized tires. i cant tell u the exact size at the moment but there soo big i need a slight lift because when u cut the wheel all the way they hit the fenders. and i do not know axle ratio. wow im sorry im ignorant. im prolly no help jerry Whats your thoughts soo far jerry?

Yes 70mph is tops!! thats prolly a whole other problem
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Old 12-01-2012, 02:38 PM   #5
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Flooring it at 55 mph in 5th is a quick way to blow a head gasket. Downshift!
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Old 12-01-2012, 02:39 PM   #6
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wow ok thanks jurob but it still shouldnt decelerate? right?
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Old 12-01-2012, 02:44 PM   #7
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Originally Posted by rubycoolness View Post
Yes that correct. There over sized tires. i cant tell u the exact size at the moment but there soo big i need a slight lift because when u cut the wheel all the way they hit the fenders. and i do not know axle ratio. wow im sorry im ignorant. im prolly no help jerry Whats your thoughts soo far jerry?

Yes 70mph is tops!! thats prolly a whole other problem
All you have to do to know your tire size is to look at it on the sidewall.

Your axle ratio is embossed into a steel tag held between two bolts at the 9 o'clock position on either of your differential covers.

The axle ratio on the below tag shown for example is indicating the axle has a 3.73 ratio. You can see the "3 73" circled in red below.
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Old 12-01-2012, 02:46 PM   #8
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also any throttling above 1800rpm it bogs/slows. a friend of mine said maybe the screen in the gas tank? and they asked me if was ever submerged in salt water which to my knowledge it never has.
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Old 12-01-2012, 02:48 PM   #9
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ok jerry. my friend is borrowing it at the moment thats why i dont have that info at the moment. but ill call her and get it.
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Old 12-01-2012, 02:53 PM   #10
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Also, are you by any chance new to driving a manual transmission? Many who are try to accelerate without first downshifting to a lower gear first which can cause problems for the engine.

But I'll be awaiting your tire size & axle ratio since the two may be grossly mismatched based on your already saying the tires are oversize.
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Old 12-01-2012, 02:57 PM   #11
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Na im good with a manual. soo a bad mis match can cause this huh? and ill have that info shortly. ur my new best friend!!
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Old 12-01-2012, 03:19 PM   #12
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ok tire size 31x10.5R15 bf goodwrench. and my girl cant find ratio but im thinkin its 3.07. she text me what the numbers looked like on the casing tag

52099458
07 610630

for 97 sahara it should be either 3.07 or 3.55.

maybe she couldnt see the 3 or the decimal but she also said it was the same on both sides. idk.
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Old 12-01-2012, 03:52 PM   #13
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31's with 3.07 gears would do it. You need to regear your differentials.
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Old 12-01-2012, 04:01 PM   #14
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31's with 3.07 gears would do it. You need to regear your differentials.

Would do these exact symptoms?
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Old 12-01-2012, 04:17 PM   #15
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Not necessarily since we can't drive your TJ to exactly know its symptoms. But let's say you're trying to accelerate hard from 5th gear when driving at lower speeds when for example you should actually be using 4th gear or maybe even in 3rd gear when accelerating. That alone can cause the engine to not have enough power and either lug or balk.
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Old 12-01-2012, 04:35 PM   #16
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So, does your rpms ever go up some when you floor it like that? It sounds to me like your clutch may be slipping.
Gears wouldn't cause him to slow down. A clutch slipping would. Unless something is horribly wrong with his gears.
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Old 12-01-2012, 04:46 PM   #17
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Quote:
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So, does your rpms ever go up some when you floor it like that? It sounds to me like your clutch may be slipping.
Gears wouldn't cause him to slow down. A clutch slipping would. Unless something is horribly wrong with his gears.
^ This. You're clutch disk is slipping.
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Old 12-01-2012, 05:26 PM   #18
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If the clutch was slipping it would happen in every gear under acceleration.
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Old 12-01-2012, 05:48 PM   #19
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If the clutch was slipping it would happen in every gear under acceleration.
Nope. I took a Mustang for a test drive one day. Accelerated great in first, second, third and forth. But when driving along in forth, I gave it gas and the engine accelerated, but the car did not. The engine can overcome the grip the clutch has in higher gears. But in lower gears the clutch can hold the connection better.
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Old 12-01-2012, 06:04 PM   #20
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Yeah its all about how much torque is applied
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Old 12-01-2012, 08:58 PM   #21
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My tj does the same as OP. If I'm traveling at 65mph in 5th gear and pin the throttle it will not pick up anymore speed but instead decelerate (speed and rpms drop really really slow). If Instead I ease into it it will pick up speed.

I also have 31x10.5x15s and 3.07s
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Old 12-03-2012, 06:51 AM   #22
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Quote:
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If the clutch was slipping it would happen in every gear under acceleration.
It's a hell of a lot easier to speed up in a lower gear, why? Less power applied because of the larger gear. Like on a bike.

While, in 5th, if you floor it, if there isn't enough friction from the clutch, it will slip even if your clutch is good. That's why it isn't ideal to drive in 5th at say 35 mph.
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Old 12-06-2012, 08:02 PM   #23
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It's a hell of a lot easier to speed up in a lower gear, why? Less power applied because of the larger gear. Like on a bike.

While, in 5th, if you floor it, if there isn't enough friction from the clutch, it will slip even if your clutch is good. That's why it isn't ideal to drive in 5th at say 35 mph.
You will lug the engine and it will die before that happens.
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Old 12-06-2012, 08:10 PM   #24
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Sounds like how a wrangler would behave with 3.07's and 31's. I barely even had a fifth gear with that combo before I re-geared..

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