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Old 06-14-2011, 08:40 PM   #1
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Auto Trans

I have a 2005 stock Wrangler Unlimited with auto trans. It is used in the mountains with very steep grades and performance is marginal with the auto trans. Question = is it possible to install the 6 sp stick that was optional for that model?

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Old 06-14-2011, 08:44 PM   #2
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Sure is.
Another option is to regear the axles in the jeep.
If you are taxing that auto add an external oil cooler to it.

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Old 06-14-2011, 08:54 PM   #3
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regear the axles. 4.88s for 33s, 5.13s for 35s. you can only go to 4.88s with a D30 front.

it is possible to swap to a 6-speed, but its a huge undertaking. lots of new parts required, and its an electical nightmare.
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Old 06-14-2011, 10:40 PM   #4
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agreed that gears would be the better choice. plus it's an upgrade most people do anyway.
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Old 06-14-2011, 11:00 PM   #5
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If you have the standard gears that comes with an auto you'd probably really be in trouble after switching to a standard transmission since the autos usually come with higher gearing (lower numbered) than standard transmissions. My 2001 Sahara I6 with auto came standard with 3:07 gears whereas I think the standard had either 3:42 or 3:73 gears.
As stated above a change in gears would be easier and probably a lot cheaper, and an automatic with the right gears can be awsome in the mountains. No brake, clutch, throttle to operate at the same time with just your 2 feet. At least this has been my experience.
Good luck on your decision.
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Old 06-15-2011, 06:40 AM   #6
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I think stock unlimited's with auto are 3:73. With stock tires, overdrive is useless except when flat. It is better with the OD off, but not really good enough for the mountians. 4:10s?
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Old 06-15-2011, 06:43 AM   #7
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Monty, (OP) I just noticed you are in Florida! Isn't the highest mountain there a freeway overpass?
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Old 06-15-2011, 07:02 AM   #8
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Quote:
Originally Posted by Gorving3 View Post
If you have the standard gears that comes with an auto you'd probably really be in trouble after switching to a standard transmission since the autos usually come with higher gearing (lower numbered) than standard transmissions. My 2001 Sahara I6 with auto came standard with 3:07 gears whereas I think the standard had either 3:42 or 3:73 gears.
As stated above a change in gears would be easier and probably a lot cheaper, and an automatic with the right gears can be awsome in the mountains. No brake, clutch, throttle to operate at the same time with just your 2 feet. At least this has been my experience.
Good luck on your decision.
if you're using the brake and throttle at the same time you're doing it wrong.
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Old 06-15-2011, 06:44 PM   #9
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I am from Florida, but this Jeep is used at my NC mountain cabin!
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Old 06-15-2011, 08:19 PM   #10
Knows a couple things...

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When you are noticing a lack of power, turn the transmission's Overdrive off. That is controlled by a switch on the dash above the shifter. The newer 4 speed automatic transmission has such a steep overdrive ratio that it makes the engine rpms too low which reduces engine power.

The good news is that the torque converter inside the automatic transmission actually gives you more low end power than a manual transmission would.

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