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2.73's to 3.73's wow

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Old 06-02-2012, 01:05 AM
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Default 2.73's to 3.73's wow

Well after 4 nights of messing around after work finally got them put in. Saved 600 bucks though doing it myself... as long as it doesn't fall a part. After i bought the nittos 555R's i went to test them out and couldn't even turn them over with my old 2.73's from a dig, even with a 3600 stall. Somebody on here was saying that with a high stall you will only gain .1 on the 1/4 from gears. I think i gained a bit more than that from how hard it launches and the nose really comes up now and scratching for traction I am very happy with my investment and just letting people that are contemplating doing a gear swap know that it's totally worth it in my opinion. 2.73's can suck my *****.
Old 06-02-2012, 09:57 AM
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is your car and auto? if so,did the gear swap change your shifting any?im going from 2.73s to 3.73s and was wondering if i was gonna hit the rev limiter or if i had to get the transmission retuned.
Old 06-02-2012, 10:51 AM
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$600 for a gear install labor? Seems a little high, usually $200-$300 for a speed shop.
Old 06-02-2012, 11:00 AM
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That depends were you are in gear install pricing. In Colorado, Jeeping is a huge sport and shops take advantage of that fact. Your lucky to get away with 500.00 per axle.

Glad you like your new gear set. I will be moving to 4.10 soon myself
Old 06-02-2012, 11:37 AM
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Originally Posted by Leeroyws6
is your car and auto? if so,did the gear swap change your shifting any?im going from 2.73s to 3.73s and was wondering if i was gonna hit the rev limiter or if i had to get the transmission retuned.
Yes his car is an auto....He had 2.73 gears which were only available in the A4 cars and he said he has a 3600 stall too

You should have the car tuned after a stall and gears, if you do them separately you should have it done again so it doesn't hurt the transmission and you aren't missing out on any gains.
Old 06-02-2012, 08:16 PM
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Congrats on doing it yourself....
Old 06-03-2012, 01:29 AM
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I just made that same change tonight. Mine would spin pretty bad with the 2.73's but I took it done the road for a test drive and it was all over the place. If it doesn't pick up at the track I'll be amazed. I hope you pick up a lot from them. Good luck!
Old 06-03-2012, 08:37 AM
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2.73 to 3.73 is an increase of 37% torque to rear wheels,I did 3.23 to 4.56 for a 41% increase(very similar percentage) so I understand your 'WOW'.
Old 06-03-2012, 04:35 PM
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what would the increase be from 2.73 to 3.42? wiould it be drastic?
Old 06-03-2012, 06:22 PM
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Originally Posted by Leeroyws6
what would the increase be from 2.73 to 3.42? wiould it be drastic?
Yes, I don't know the exact figure but its fairly close to the 3.73 so it would be a huge difference from the 2.73.
Old 06-03-2012, 08:17 PM
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Originally Posted by little_chewy_69
Well after 4 nights of messing around after work finally got them put in. Saved 600 bucks though doing it myself... as long as it doesn't fall a part. After i bought the nittos 555R's i went to test them out and couldn't even turn them over with my old 2.73's from a dig, even with a 3600 stall. Somebody on here was saying that with a high stall you will only gain .1 on the 1/4 from gears. I think i gained a bit more than that from how hard it launches and the nose really comes up now and scratching for traction I am very happy with my investment and just letting people that are contemplating doing a gear swap know that it's totally worth it in my opinion. 2.73's can suck my *****.
419 lbs of tq and you couldn't spin your tires even with a 3600 stall because of your 2.73 gears?
I have to ask, how is that possible?
Old 06-03-2012, 08:47 PM
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Originally Posted by FirstYrLS1Z
2.73 to 3.73 is an increase of 37% torque to rear wheels,I did 3.23 to 4.56 for a 41% increase(very similar percentage) so I understand your 'WOW'.
Actually, there are a few posts in the dyno results forum where they show on graphs that changing to lower gears will cost you hp/tq, all else being equal.
Gear swaps are great for the seat of the pants feel. And if you have a stall they will make it easier to keep up with stop and go traffic too. But seriously, they just don't seem to have much of an impact on 1/4 mile times if you are already stalled.

Last edited by dannyz; 06-03-2012 at 09:13 PM.
Old 06-03-2012, 09:36 PM
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I did the 2.73-3.73's first and it was huge difference not to mention with some dr's shaved .4 off my time. Now with a stall - crazy. lol
Old 06-03-2012, 10:53 PM
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Originally Posted by dannyz
Actually, there are a few posts in the dyno results forum where they show on graphs that changing to lower gears will cost you hp/tq, all else being equal.
Gear swaps are great for the seat of the pants feel. And if you have a stall they will make it easier to keep up with stop and go traffic too. But seriously, they just don't seem to have much of an impact on 1/4 mile times if you are already stalled.
Well, we def will see if mine helped because it will be at the track tuesday or friday of this week! It would have been today but I got busy.
Old 06-04-2012, 01:14 PM
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Originally Posted by Leeroyws6
what would the increase be from 2.73 to 3.42? wiould it be drastic?
I went from a 2.73 to a 3.42 and WOW, it was like night and day. I'd live to get a set of 3.73's but all I have is a 4.10 rear. I may try it for grins but will probably end up keeping the 3.42's.
Old 06-04-2012, 04:32 PM
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are those the 4.10s' I sold you a couple years back.
4.10s' grin ?,a bigger grin would be 4.56s' with a yank SS3600 like i've been running for 4 years,but now I'm back to the OEM 3.23s'.
Old 06-04-2012, 05:13 PM
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What size rear tires are you running, and are you running a street tire, drag radials, or slicks? I only ask because that 10 bolt is a ticking time bomb. My buddy was running his t/a at the track, he had richmond 3:73 gears with 295 drag radials. The lights on the trees went green and his 10 bolt went snap. So just watch how hard you are launching that car.
Old 06-04-2012, 10:05 PM
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Originally Posted by bigz28man
What size rear tires are you running, and are you running a street tire, drag radials, or slicks? I only ask because that 10 bolt is a ticking time bomb. My buddy was running his t/a at the track, he had richmond 3:73 gears with 295 drag radials. The lights on the trees went green and his 10 bolt went snap. So just watch how hard you are launching that car.
He has an auto, so he should be fine.
Old 06-04-2012, 10:06 PM
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yeah i know my 10 bolt isn't gonna hold up very long with the nittos i don't intend on running it down the track with it. Have plans for an S60 soon but transmission is first on the list. Hopefully have that ordered within the next weeks. i'm more worried about wrecking a 900 dollar stall converter when the tranny goes. But it's not i drive it like a 16 year all the time so i think i'll be okay for a while.
Old 06-04-2012, 10:17 PM
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Originally Posted by little_chewy_69
yeah i know my 10 bolt isn't gonna hold up very long with the nittos i don't intend on running it down the track with it. Have plans for an S60 soon but transmission is first on the list. Hopefully have that ordered within the next weeks. i'm more worried about wrecking a 900 dollar stall converter when the tranny goes. But it's not i drive it like a 16 year all the time so i think i'll be okay for a while.
Oh, I think your 10 bolt will hold up just fine on nitto's.
Untill your 60' times get down into the very low 1.5's and under your good.
And you won't see those on your current set-up.


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