Gears & Axles - Who has 410's, Or 373's In there A4?

Im gearing the rear end... And want to know what was the performance diffence from stock gears. 1/4 gains, ET, Trap. And never the less...

Top End!?

Im gearing the rear end... And want to know what was the performance diffence from stock gears. 1/4 gains, ET, Trap. And never the less...

Top End!?

I picked up a .2 tenths going from 3:23's to 3:73's without my converter. it was not as good on gas on the highway. 2700 rpm at 70-75 ish id say. been a while since i drove it.

I picked up a .2 tenths going from 3:23's to 3:73's without my converter. it was not as good on gas on the highway. 2700 rpm at 70-75 ish id say. been a while since i drove it.

Did you ever try top end?

Thx, for posting! :cheers:

I just had 3.73 installed along with heads cam intake. The car is a beast is all I can say right now. Im still getting used to it.

Do you currently have 3.23s? If so, ET reduction from a 3.73 swap with the 3800 stall already in your sig will be limited to about 1 tenth.

Do you currently have 3.23s? If so, ET reduction from a 3.73 swap with the 3800 stall already in your sig will be limited to about 1 tenth.

I do have 3.23s... So gear swap will not be too beneficial? And Top end is sacrificed. right?

4.10s or more dont be a pussy. 4.56s FTW!

I had 3.73 in my 97 z28... with the longtubes ORY and cutout open it was a mean SOB... i could roast the hell out of the tires at will. The Butt-O-Meter approved.

I just had 373's installed..its a big time accelerstion improvement over the 273's...im also getting used to them

I do have 3.23s... So gear swap will not be too beneficial? And Top end is sacrificed. right?

3.23 to 3.73 swap isn't worth much in the way of ET reduction once you have a 3500+ stall. Some of the people responding who have done this swap seem to still have stock stalls, which is entirely different than doing the swap with a 3800 stall already in place. Unless you need a new rear anyway, or are able to do the labor yourself and only pay for the gears, it's not worth the cost IMO. But if you're running out of other things to do and you want every last ounce of ET reduction, or if you don't like the street manners of the 3800 stall and want a "tighter" feel around town, then this could be a good option. Don't expect significant gains though. Even a 2.73 to 3.73 swap isn't worth much in the way of ET reduction with a 3500+ stall already in place.

Yes, top end will be reduced some with the 3.73s, but you'd still be able to hit around 130mph at ~6500 rpm with a stock tire diameter in 3rd gear (much higher if your trans can handle a WOT upshift into OD).

You will lose MPG with the 3.73s though. Not a huge difference, but there will be a loss. Just something else to consider.

Cheaper solution... Find a rear end out of an M6 car with low miles and 3.42's you might even be able to trade...

Cheaper solution... Find a rear end out of an M6 car with low miles and 3.42's you might even be able to trade...

3.23 to 3.42 swap would be almost imperceptible in terms of performance improvement, and even if you find a great deal on the axle and install it yourself, there will still be the cost of a retune for shift point and speedo correction (unless you have your own tuning software).

But I understand your reasoning, and think this would be (and is) a good option for 2.73 cars that want more gear.

With 3.23's, like rpm said, I wouldn't mess with it unless you can install them yourself. If your paying someone, it would be no where near worth the cost involved. Save your money for a 9 inch and worry about gear ratio then.

Wouldn't recommend doing the 4.10's or higher if it's a DD car. I'm doing 2500 rpm's at 70 in mine. The get up is nice but not fun when cruising down the highway. Gas mileage suffers.

I noticed a huge performance feel going from 2.73 to 3.73. I also had a 3200 stall and then swapped to a 4000 stall. I loved it..

I sold that car and now looking into another fbody with 3.73.. But my car wont really be a DD so im wondering how a 4000 stall and 4.10 gears in an auto will perform.

4.10s or more dont be a pussy. 4.56s FTW!

lol i agree. i like having 4.10s. it sucks gas but i dont care it compliments my setup perfectly but im nowhere near stock.

Had 4.56s' A4 for 4 years,just recently went back to the OEM 3.23s'. 1st & 2nd were wicked,mpg was good and freeway running was OK. Damn,I miss those 4.56s',but the 4.56 rearend is complete so I can put it back in anytime.

In my opinion if ur trying to better ur 1/4 mile times would look at converters o went from 2.73 to 3.73 picked up 2 tenths added a yank 4000 ss picked up 4 tenths more car still drove good on the street but I know every set up is different. Good luck

I do have 3.23s... So gear swap will not be too beneficial? And Top end is sacrificed. right?

no not in your position

and how often do you exceed 130mph anyway.

I really liked my 3.73's when I had my 10 bolt. Good on the highway and still had good get-up. I'd do the 3.73's for a nice street car. You can really roast the tires with the 4.10's though which is fun and you do notice quicker acceleration. Just not a fun highway car.

On the topic of gears, I would love to try my hand at some road courses, does that impact the 3.73 v 4.10 debate at all? I also have an A4 with 3.23.

I had mine top out the speedo with 3.73 just for shits and giggles only time ive did it though

Had 323 gears with a 3800 stall. Car felt faster with 373s installed but on roll races with cars a tad faster than me I still lost. At the track I gained nothing. I should have kept the old gears in-ring and pinion stronger with the taller gears.

I have 373s in my 98 a4. Love em

I just bought a rear with 4.10's in it. I'm coming from 2.73's and I can't wait for the change. I barely take it out on the hwy anymore so I could care less about high rpms or gas mileage. I will be doing a lot of 1/8 mile racing, so I think these will suit me just fine.

For 1/8th you could run higher or are you street driving it too?

4.10's and higher are great for the track. Mine isn't a dd so it doesnt bother me to have 4.10's or higher.

For 1/8th you could run higher or are you street driving it too?

Probably only drive it on the way to the track, and that's it. I might take it through town every once in awhile. I got bored with it being a street car.

You could probably run the next higher gear ratio if you just do 1/8th

my A4 with 4.56s' was great for the 1/8 but had to shift to 4th to finish the 1/4.

Yeah, do 4.10's for the 1/4 mile. I'm trapping around 6500 rpms with the 4.10's. I wouldn't go any higher unless you get a taller tire under there.

I have the setup in my sig, absolutely love the 4.10s and 28" tire with a 4k+ stall. Will be doing 3.90s when I upgrade the rear though as I am on the limiter before the stripe. I recommend 3.90s over the 4.10 as they are much stronger and would be a good improvement over the 3.73s for road course work IMO.

I DD with 4.10s, its not that bad compared to my 3.73.

3.23 to 3.73 swap isn't worth much in the way of ET reduction once you have a 3500+ stall. Some of the people responding who have done this swap seem to still have stock stalls, which is entirely different than doing the swap with a 3800 stall already in place. Unless you need a new rear anyway, or are able to do the labor yourself and only pay for the gears, it's not worth the cost IMO. But if you're running out of other things to do and you want every last ounce of ET reduction, or if you don't like the street manners of the 3800 stall and want a "tighter" feel around town, then this could be a good option. Don't expect significant gains though. Even a 2.73 to 3.73 swap isn't worth much in the way of ET reduction with a 3500+ stall already in place.

Yes, top end will be reduced some with the 3.73s, but you'd still be able to hit around 130mph at ~6500 rpm with a stock tire diameter in 3rd gear (much higher if your trans can handle a WOT upshift into OD).

You will lose MPG with the 3.73s though. Not a huge difference, but there will be a loss. Just something else to consider.

I agree with the bolded sentence but once the cam is changed, gear has to be changed to match. When I had the stock cam, the car was a beast off the line with the converter, now with the aftermarket cam, it's very lazy off the line but picked up MPH on the top end. When I had the runs recorded, managed to hear the car just get into 3rd and the traps were only a few feet away as opposed to the stock cam where the car would get into 3rd sooner. So it depends on the setup.

I believe my friend picks up 1-1.5 tenths and mph or better from from running 3.73 to 4.10. This is in a mild SB in a 3rd gen w/ shift points arund 6k if that matters. 3400lb car with drivier

What is a comfortable rpm for the ls1 on highway cruising?

3:73's :cheers:

I agree with the bolded sentence but once the cam is changed, gear has to be changed to match. When I had the stock cam, the car was a beast off the line with the converter, now with the aftermarket cam, it's very lazy off the line but picked up MPH on the top end. When I had the runs recorded, managed to hear the car just get into 3rd and the traps were only a few feet away as opposed to the stock cam where the car would get into 3rd sooner. So it depends on the setup.

This. I have a MS3 and it felt good with 3.73s. The pinion gear ate a tooth and I had to swap a 2.73 10 bolt in for the time being. The car is a dog now, takes forever to get into its powerband and seems slower...

There's a 4.10 10 bolt for sale locally for $250 that I'm thinking about getting but my car is a DD and I also do t want to shift into 4th at the track so I'm hesitant.

3.73 is cheap power. One of the biggest differences I've seen on my car

I really liked my 3.73's when I had my 10 bolt. Good on the highway and still had good get-up. I'd do the 3.73's for a nice street car. You can really roast the tires with the 4.10's though which is fun and you do notice quicker acceleration. Just not a fun highway car.

i enjoy my 4.10s the most on the highway.

i had a 4.10 in my old 98 z28 with a lid,catback and programmer,went 8.20 at 86 mph on et streets,and 8.20 @88 mph on street tires sprayin a 125 dry shot in 2nd gear lightly,then it blew out lol