loosing power going up hill

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Louie

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Apr 30, 2021
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usa
Hey Guys,
i have a 2009 JK 3.8 manual trans with 35'' tires, it looses power driving up hill. even downshifting fells like it takes a while to catchup.
any advise?

Thanks
 
Louie said:
Hey Guys,
i have a 2009 JK 3.8 manual trans with 35'' tires, it looses power driving up hill. even downshifting fells like it takes a while to catchup.
any advise?

Thanks
Click to expand...

What is your axle gear setup? Anything below 4.10 for a manual 3.8 on 35's is going to be sluggish.
 
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Recalibrating the speedometer is super important on automatics because it manages the shift points, but manual trans it only changes what the speedo says, so that is not your problem.

I would change spark plugs, if you haven't already. It's time. I was surprised how much difference it made when I did my 2009.

Use the gearing chart to see where you fit. I would hope that the ratio is on the rear diff. It's just a little metal tag, so may have been taken/ fallen off. Probably buried under gunk. Start there. If you have 3.21 or 3.73 that is probably the problem. Especially 3.21.


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