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Old 11-13-2015, 11:09 AM
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Acceleration

My acceleration has gotten very, very slugglish and slow on my automatic 2000 TJ. Could this be spark plugs/motor issues, gears, or most likely just a transmission issue?

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Old 11-13-2015, 11:17 AM   #2
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Originally Posted by riverlsu View Post
My acceleration has gotten very, very slugglish and slow on my automatic 2000 TJ. Could this be spark plugs/motor issues, gears, or most likely just a transmission issue?
spark plug coils possibly? Do you lose RPMs while goin up hill

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Old 11-13-2015, 11:47 AM   #3
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honestly I would think upstream o2 sensor. Try unplugging it and running it like that.
If it gets better replace it.
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Old 11-13-2015, 12:36 PM
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I just had my transmission "rebuilt" but it's still very slow. When I start accelerating past first gear, my gears shift really slowly and I feel like I have to push the pedal to the floor just to barely keep it up to speed but my gears seem like they're revving up over and over again and running on top of eachother.
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Old 11-13-2015, 12:37 PM
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and yes, it is worst when going uphill but still bad on flat road.
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Old 11-13-2015, 03:05 PM   #6
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its worse than it used to be correct?

Have you checked exhaust manifold? Cat converter? Spark plugs?
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Old 11-13-2015, 03:41 PM   #7
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What size tires are you running and have you recently installed larger diameter tires?
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Old 11-13-2015, 04:16 PM
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I'm running 35x12.5 on dana 35/30 set up.
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Old 11-13-2015, 04:21 PM   #9
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on stock gears? 3 speed auto?
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Old 11-13-2015, 04:40 PM   #10
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I'm running 35x12.5 on dana 35/30 set up.
Ooohhhh, that 35" tire diameter is why your acceleration is so bad if you have never regeared your axles to a more appropriate lower ratio like 4.56. Not to mention that if your rear axle is still running stock axle shafts, there's a time-bomb ticking on one of your rear axle shafts. A stock Dana 35 is just not up to a tire as large as a 35", a broken axle shaft on the trail is the usual result.
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Old 11-13-2015, 07:31 PM
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i really did think it was the gears! what would be the best gear ratio in your opinion? and how hard/long does it take to install a new one?
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Old 11-13-2015, 07:34 PM   #12
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Depends on your engine and transmission

Most likely 4.88s since that's the biggest that would would in your front diff

To install you need a lot of specialty tools and experience so it is often recommend to have a professional install which is about 5-700 per diff
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Old 11-13-2015, 07:43 PM   #13
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i really did think it was the gears! what would be the best gear ratio in your opinion?
As I suggested above, 4.56 is appropriate for your 35" tires in view of your 3-speed 32RH automatic transmission. 4.88 would only be appropriate for a transmission with an Overdrive ratio, which your 32RH does not have.
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Old 11-16-2015, 07:58 PM
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As I suggested above, 4.56 is appropriate for your 35" tires in view of your 3-speed 32RH automatic transmission. 4.88 would only be appropriate for a transmission with an Overdrive ratio, which your 32RH does not have.
So 4.56 with 35's is the way to go? Is this going to help my acceleration if my current gears are much lower than 4.56? Is this going to put any extra stress on the dana 35? Also, is this going to affect my gas mileage?
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Old 11-16-2015, 08:25 PM   #15
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So 4.56 with 35's is the way to go? Is this going to help my acceleration if my current gears are much lower than 4.56? Is this going to put any extra stress on the dana 35? Also, is this going to affect my gas mileage?
As was already mentioned elsewhere in my post you quoted, your Dana 35 is not up to 35's. What I would do is downsize the tires to 33" which will improve power and reduce the load on the Dana 35 down to a more acceptable level. 4.10 would be the optima. axle ratio for 33's and your 3-speed automatic.
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Old 11-28-2015, 12:42 AM
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As was already mentioned elsewhere in my post you quoted, your Dana 35 is not up to 35's. What I would do is downsize the tires to 33" which will improve power and reduce the load on the Dana 35 down to a more acceptable level. 4.10 would be the optima. axle ratio for 33's and your 3-speed automatic.
How would downsizing to 315/75r16 tires with 3.73 gears do on a dana 35? or would 33's be much better for stress on the dana 35/30 and best for acceleration?

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