3.73's or 4.10's in 01 trans am?? - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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Old 07-30-2006, 10:17 AM   #1
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Default 3.73's or 4.10's in 01 trans am??

Just picked up an 01 ramair trans am with an automatic trans.It has 3.23 gears now and i'd like to wake it up a little bit. Whats the gear of choice for an automatic car ???? The car is just a cruiser and will never see any mods other than a shift kit and gears. also who makes the best gears for these rears,and what has to be done for the speedo ???

thanks much.........

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Old 07-30-2006, 11:02 AM   #2
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have you considered getting a larger stall? i think that will help to "wake" it up some. maybe something in the 2800-3400 range.
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Old 07-30-2006, 11:44 AM   #3
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if you absolutely want gears most people suggest 3.73's for an A4, 4.10's for an M6, but... if you dont drive it everyday, its going to be a pure drag car and you want to get off the line like a mofo, id suggest getting a 12 bolt then decide what gears you want...
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Old 07-30-2006, 03:19 PM   #4
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if it's just a cruizer, I'd recommend:

shift kit
3.73
3k to 3500 stall
and maybe some longtubes and TD's for sound, but I know you didn't ask about those
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Old 07-30-2006, 05:46 PM   #5
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Quote:
Originally Posted by CamTom12
if it's just a cruizer, I'd recommend:

shift kit
3.73
3k to 3500 stall
and maybe some longtubes and TD's for sound, but I know you didn't ask about those
My thoughts exactly.

See you got the beastly 22-RE too(defnitely a force to be reckoned with on the streets).
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Old 07-30-2006, 06:18 PM   #6
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Thanks guys, I already have a 10 second firebird,i'm not looking for another what i am looking for is a little more power and a crisper shift. I think gears and shift kit is all i need. I wouldnt mind getting a little more mpg either !!!! Exhaust is out of the question. I dont like em loud. A converter is an interesting thought...... how bad does it effect the mileage and drivability ??? remember..........DAILEY DRIVER.


thanks much


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Old 07-30-2006, 07:20 PM   #7
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Driveability in my friend's 4k stalled car is awesome!

...but it's a little high of a stall for a no-track DD . city mpg went down a little, highway stayed the same. If you have a buddy with a stalled auto car (doesn't so much matter what it is) I'd ask him if you could take a 'wussy-foot' trip around the block to feel it out. Part throttle feels a little 'squishier' the larger you go on the stall rpm, but once you start leaning into the gas it'll feel a lot better . I personally prefer a stalled auto over a stock TC (all my cars are manual, thank goodness hahaha. EDIT: forgot about the T-bird... yeah, it's been sitting in storage that long . It's getting a stall, though )

As far as exhaust goes, there's a lot of good flowing exhausts that are pretty quiet, but that's really a personal choice if you want to do it or not.

And as far as my 22-RE goes, I need to do the !plugged cat mod before I can really find out how beastly she is
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Old 08-20-2006, 09:31 PM   #8
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Why dont you just try a good converter first. You may not need gears. I just put in a 3200 Vigilante and picked up .4 in 1/4 mile times, and that is with a 2.73 gear. On the street it is awesome, the only other mod is a lid. Ive heard either a gear or a converter will give a good improvement, but both together will not be that much more improvement. Good luck with your choice.
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Old 08-29-2006, 06:53 AM   #9
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Quote:
Originally Posted by 98ls1blackbird View Post
Ive heard either a gear or a converter will give a good improvement, but both together will not be that much more improvement. Good luck with your choice.


going to 3.73's from 2.73's with that convertor willgive you ATLEAST, .25 in the 1/4. IIRC, Gears help a convertor more than a convertor helps gears.

Not to be a dick.

Anyways. AAM makes just about the best gears. They are OEM quaility. I would think that 3.73's will suit you pretty nice with about a 26" tire. But steping up to bigger tires, like "20's", that put you closer to a 30" tire, the car would like 4.10's. A high stall convertor is also a nice option, as it doesn't effect highway milage once it locks up. and only takes 1-3 MPG off the cit milage.

If you wanna improve MPG, a catback is a must, and adding headers is even better. It doesn't have to be loud. Even dynomax/summit turbo mufflers flow very well, and are quite controlled. Just keep away from flow(not the)master.
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Old 08-29-2006, 07:02 AM   #10
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try 3.42s a friend of mine put them in his auto TA and he loves them. still very streetable. but i wouldnt going higher then 3.73s. 4.10s are for the M6s. although if i ahd another car could drive id put 4.56 gears in my car.
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Old 08-29-2006, 08:51 PM   #11
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the difference between 3.23 and 3.42's is so small, that it's hard to justify doing. it's about a 6% difference. meaning if your crusie rpm is 1500 at a givin speed, is about

Gears RPM ........ Difference . Starting gear
3.23's : 1500 ...... 0% ......... 9.88
3.42's : 1588 ...... 6% ......... 10.47
3.73's : 1732 ...... 13% ....... 11.41
3.90's : 1811 ...... 17% ....... 11.93
4.10's : 1904 ...... 23% ....... 12.55

I forget how tires play a role, but I think 11 is about perfect for a 27" tire.

It's nice to know facts when making a decsion like this.

Gear installs run about $200-400, plus gears($175), thats about $500 in the middle ground. A convertor on the other hand can be install be most people, and tend to run about 500+ for a quaility 9.5" unit. I would also think at this point the convertor of about 3000 would drop about .5 in the 1/4.
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Last edited by mrcadillac; 08-29-2006 at 08:54 PM. Reason: screwy
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Old 11-03-2006, 12:31 AM   #12
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i do believe summit has some 3.90s that will fit the stock rear end.
that may be a thought. although i did hear they were nosier than both the 3.73 and 4.10s. hopefully somebody can verify something i've said.
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Old 11-14-2006, 01:23 PM   #13
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supercharged A4 lt1 camaro with 315/35's on the rear, what kind of gear woudl be preferred with a 3200-3600 stall?
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Old 11-14-2006, 01:23 PM   #14
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p.s. not to steal your thread sorry man!
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Old 11-14-2006, 01:49 PM   #15
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On an A4 LS1 a 4.10 gear is waaaay too steep 9 times out of 10. 3.73 is really the biggest you want to go. Maybe 3.90, but that's pushing it.
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