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Old 04-27-2007, 08:55 PM   #1
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Higher gears, better with auto or stick

Does the automatic transmission react differently than the manual when referring to the use of larger tires. Is the automatic handle larger tires better or worse do you think??? THanks for any ideas. Highway, off road, etc..

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Old 04-27-2007, 08:57 PM   #2
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I'm guessing possibly a bit worse since it has less gears compared to the 5-6 speed manuals..

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Old 04-27-2007, 08:58 PM   #3
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I would think that the manual tranny would be better as you would have more control over gear selection and how long each gear is held out before shifting, but this is really just an opinion based on running my own rig with a 5 speed and 33's.
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Old 04-27-2007, 08:59 PM   #4
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manual.
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Old 04-28-2007, 08:37 PM   #5
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i have the feeling that my 06 TJ with 4speed auto tranny and 32s drivves better and faster than my old 00 TJ with 5speed manual tranny and 30s.
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Old 04-28-2007, 09:29 PM   #6
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Did it have a four banger or something compared to a 6? Because the manual tranny actually has lower gears.
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Old 04-28-2007, 09:44 PM   #7
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The auto is higher geared, so the manual is better.
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Old 04-28-2007, 10:19 PM   #8
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Eric the +02 models have 10-15 extra horses... maybe thats why? It's newer and newer usually runs smoother.. as faster goes maybe its because its not worn and/or trashed? I'm just wondering thats all
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Old 04-29-2007, 01:04 AM   #9
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Automatic transmissions cope far better with bigger tires because of their torque converter. The torque converter gives more torque at startup and also gives what is in effect an infinitely low first-gear ratio... as well as an infinitely high crawl ratio.

Automatics cope with bigger tires due, again, to that torque converter.

And because of that torque converter which also gives 2-3X more torque (yes, no rumor), that infinitely low first gear ratio gives the effect of having a lower (better) axle ratio and that higher crawl ratio.

So if anyone were to compare the first gear ratios of an automatic and a manual and assume the 5-speed gives better performance if it had a lower first-gear ratio, that would be incorrect... again due to that magical torque converter box that gives (again) what is, in effect, an infinitely low first-gear ratio.

Again, don't let first gear ratios shown in various guides throw you when comparing autos vs. manuals because the torque converter really makes them meaningless where an automatic is concerned.
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Old 04-29-2007, 01:20 AM   #10
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What Jerry said was very right. Look at it like this. There are times with your stick that you might have to slip the clutch to get things moving on an obsticle. On the same obsticle with an auto my auto will be sitting on the torque converter and want to dig in and climb right off the spedal instead of needing more RPM's to do the same work.
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Old 04-29-2007, 01:47 AM   #11
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I have an auto and agree that off road it's great. However, on the highway, especially steep inclines, the auto is even more of a pig when on oversized tires (even regeared).
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Old 04-29-2007, 01:59 AM   #12
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Quote:
Originally Posted by RedRubiTJ View Post
I have an auto and agree that off road it's great. However, on the highway, especially steep inclines, the auto is even more of a pig when on oversized tires (even regeared).
What size tires and what ratio did you regear to? It sounds like you didn't regear low enough, a common mistake.
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Old 04-29-2007, 02:12 AM   #13
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No mistake here , I'm on 37's and 5.13's which are the biggest gear you can go on the 44's. In actuallity I am lower geared (~0.95) than I was stock (31's/4.10's), The problem lies in the larger rotational mass in addition to the larger diameter.
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Old 04-29-2007, 02:24 AM   #14
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Red, you also have the 4 speed tranny which is a dog with any tires/gearing on it with the O/D on. I'm sure you've kicked it off every once in awhile and see the difference it makes.
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Old 04-29-2007, 02:32 AM   #15
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Incline = OD off, although TBH with the stock setup I didn't need to very often. Now, I get a mildly steep incline and with OD off it kicks out of 3rd to maintain (40 mph?). I wouldn't mind so much but 2nd and 3rd are pretty far apart so RPMs go pretty high if I'm not careful. And I counted the teeth before we put them in .

Edit: around town and on the normal LA freeways it's not a big deal, only when I have to go up to the mountains or through the high passes (cajon, grapevine).
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Old 04-29-2007, 02:46 AM   #16
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Edit: around town and on the normal LA freeways it's not a big deal, only when I have to go up to the mountains or through the high passes (cajon, grapevine).
Grapevine is a pretty good pass though. I'm sure my dog with 35's and 3.73's wouldn't like it up there.
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Old 04-29-2007, 03:00 AM   #17
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Grapevine is a pretty good pass though. I'm sure my dog with 35's and 3.73's wouldn't like it up there.
Yeah, it sucks getting passed by an empty semi (prior 37's and 4.10's) .

I've only been buying automatics for about 10 years now. I previously always ran manuals. However, even with the lack of power, I would choose the auto again. The OP just asked which would be better and if things like that really matter to them, manual may be a better choice. Personally, I didn't get the TJ for racing so I don't mind much.

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