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Thread: Rearend Gears
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03-30-2010, 01:24 PM #1
Rearend Gears
I have a basically stock 99 T/A. Auto 4spd. Bought it new in 99.
Added a magnaflow exhaust and a Ram Air hood with air box,3.73 gears.
My question is this. I really don't have the cash to stick in the motor right now.
Other than bad fuel mileage,what would the cons be to put in some 4.10 gears to get this thing off the line a little quicker. This is an everyday car other than winter months. Will there be much difference or worth it changing the gears?
Thanks.
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03-30-2010, 01:32 PM #2
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- Jan 2010
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Black- 99 WS.6 - Modified
Top speed will drop, rpms will be higher when crusing at higher speeds. Tach and speedo will read different too without an adjustment tune. Most people are of the opinion that 3.73s are the best gear for an a4. You might see a slight pickup in your 1/4 mile et - maybe .05 to .1 or so. If you're running a stock stall - IMO you'd be better off putting a better stall and maybe a shift kit + tune instead. Your call though.
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03-30-2010, 02:08 PM #3
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- Feb 2007
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- San Diego, CA
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- 5,823
2002 Z28 A4 NBM- Sadly now demodded :(
Big stall (3400 or bigger) will put a smile on your face. You'll need supporting mods also like a tranny cooler and tuning. While it's out you might want to take a look at the tranny internals.
If you do gears 3.73 is better than 4.10 for an A4 because we only have 1 overdrive gear.
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03-30-2010, 08:19 PM #4
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- Jun 2008
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- Euclid,ohio
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Black- 1998 Z28
I gained .5 in the 1/4 going from 3.23s' to 4.56s',going from 3.73s' to 4.10s' you might gain .1-.15. Do a stall w/fluid cooler,as you already have the ideal gear(3.73) for an A4.
MPG is right foot dependent,I only lost 3mpg with the 4.56s'.
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03-30-2010, 08:21 PM #5
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04-03-2010, 03:01 PM #6
I have an A4 with 3.73's and it's only a weekend toy and I wouldn't go up to a 4.10 unless I was just driving it to the track and meets. With the 3.73's it's at 2500rpm and we do alot of highway driving and even the backroads are 65 to 70mph an usually going faster so my car is always at 3k rpm so I couldn't see 4.10's if you drive it alot.
1998 Trans Am 85k miles.
Bolt ons, MS3 113LSA cam, Circle D Stall, Tune, Modified WS6 style hood, Full Suspension, 6000k HID's, Clear Side Markers w/ Leds, Led 3rd Brake Light and 18" AR Staggered Killer Wheels w/ BFG KDW NT's.- Weekend Toy/DD
02 Trailblazer -Sold
09 Ram 1500 CC - Sold
09 Cobalt SS/TC - Sold
13 ram 1500 LoneStar CC 4x4 - Magnaflow, K&N,and more to come-DD/Toy
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04-04-2010, 04:41 AM #7
one of the "cons" of 4.10 gears in an A4, would be highway driving. Just say you were doing 70 MPH in O.D., and you need to pass (go around another vehicle), so you give it more gas, and the PCM decides to drop it into 2nd gear, you are now way over the redline, and you can blow the engine.
I have 3.73's and a Y3000 yank stall, and I go from "farfegnugen to fukenmovin".
Get a 3600 stall, and forget the 4.10's
SteveC
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04-04-2010, 05:31 AM #8
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- Jun 2008
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- Euclid,ohio
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- 197
Black- 1998 Z28
I have 4.56s' in an A4,the PCM does not/will not drop it into an inappropiate for passing.
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04-04-2010, 05:03 PM #9
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04-04-2010, 07:21 PM #10
Ive never heard a PCM dropping it in a wrong gear just because you've moved up to 4.10's in a A4. This could be something i wasnt aware of but ive never heard of it nor thought it was possible.
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04-05-2010, 05:24 PM #11
4.10's in the auto would be brutal! In a good way! Top speed obviously and a higher cruising RPM would be affected. Plenty have done it Just have to play around with gear calculators to see if it would be for you.
It would definitely put some kick in.
I would do a stall way before going to a higher numerical gear though.370 CI - Twin 6766 Turbo - Jakes stage 5 4L80E - MWC 9" - Holley Dominator
Build in progress...
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04-05-2010, 07:02 PM #12
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- Jun 2008
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- Euclid,ohio
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- 197
Black- 1998 Z28
my 4.56s' with my 2800 stall(1000 over stock) is brutal in 1st and 2nd.
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