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post #1 of 7 (permalink) Old 09-26-2008, 01:26 PM Thread Starter
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transmission question

ok, so im only 18 and I am just starting to get into cars and the technical parts of them, i know intrepids and other LH cars have 4 speed transmissions..my question is

Are there any advantages to having the 4-speed transmission or are there any disadvantages?

i am just curious
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post #2 of 7 (permalink) Old 09-26-2008, 02:11 PM
 
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Compared to what? Compared to a 3 speed automatic, yes, there is a big advantage, that being that you can have an overdrive ratio for slower engine speed and increased fuel mileage at highway speeds. Also, you can use a lower (Higher, numerically) differential ratio for acceleration, allowing the overdrive to drop RPM's to a reasonable level for cruising. For example, if you lock OD out on your 4 speed automatic so that you're in 3rd gear, you'll observe that the RPM's at 60 MPH are probably 2800 rather than 1900 in OD. Of course, going all the way back to 2 speed automatics like the Powerglide, the advantage is even greater. The fewer gears you have designed in, the more compromises you have to make. For a 2 speed automatic to give decent acceleration, you have to force the engine to buzz at highway speeds (or have a huge engine with lots of torque so it can give acceleration with a high (lower numerically) gear ratio). Suffice it to say that your Intrepid would be much slower with a 3 speed unless it was geared way down, which would increase gas consumption.
Compared to a 5 speed, 6 speed, or even the 7 or 8 speed automatics coming on some cars, the 4 speed is at a disadvantage. The more gears you have, the better you can choose ratios to keep the engine in the power range you want. All things being equal, a transmission with more gears should give better acceleration, and OD can also be a higher ratio for better mileage.

Last edited by CluelessinMO; 09-26-2008 at 02:17 PM.
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post #3 of 7 (permalink) Old 09-26-2008, 10:43 PM Thread Starter
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ok thanks ...and i was comparing to 5 & 6 speeds lol not 3 speeds
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post #4 of 7 (permalink) Old 09-26-2008, 11:41 PM
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ok thanks ...and i was comparing to 5 & 6 speeds lol not 3 speeds
Read clueless' answer near the end, it must have been an edit.

More speeds = better. But also more complex, more expensive and not what Chrysler would do since they are not the best when it comes to transmissions. What also sucks about a 4 speed is that in autostick ure out of gears in no time LOL.

Most automatics are 5, so its not an amazing disadvantage with ours like the 3 was for the minivans. I think the new chargers are 5 speed automatics so chrysler made the change.

You wont see 7 speed automatics on anything but benz suvs or other high class vehicles.

Regardless of how many speeds they have, they wont outperform a manual car when it comes to acceleration :(

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post #5 of 7 (permalink) Old 09-27-2008, 11:54 AM Thread Starter
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yeah i figured that...has anybody ever done a 5 speed manual swap in a LH?

ive never heard or seen it..probably too much money
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post #6 of 7 (permalink) Old 09-27-2008, 11:56 AM
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yeah i figured that...has anybody ever done a 5 speed manual swap in a LH?

ive never heard or seen it..probably too much money
probably not very practical.

If anything i would rather invest in a RWD conversion from the LX. If there was enough room a 5.7L would be nice LOL. But when you add up the costs, you are prob better off getting a charger LOL. They arent that expensive and options are pretty endless on those cars.
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post #7 of 7 (permalink) Old 09-27-2008, 12:06 PM Thread Starter
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yeah...i would love a 5.7 rwd intrepid r/t
even a 3.5 s/c or something that would be crazy...
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