transam69230

iTrader: (49)

I want to get 3.73 gears for my a4, and i have been searching around and am not completely sure what i need. Like a n new instal kit, ring pinion spacer. I don't know what size carrier i need ither. Will 3.73's be to high for a daily driver. Right now all have is headers, lid, and custom 2.5 in exuhasut. I really need help with getting some gears.

HotRodNeil

I just checked this out, and here's what I found. Richmond are too noisy for many people for a street machine. Some were lucky, but in general that make more noise. If you have a series 2 carrier, like me, you will not be able to get the gears from Motive, as they don't make series 2 for us. It appears that USgear, which also makes Strange may be the best. The ring & pinion are about $225 and the bearing kit is $95. I'm going from a 2.73 to a 3.73 and have an A4 with about 330HP.

I've been making phone calls all day on this, so your timing is excellent.

99z20ate

iTrader: (1)

wow neil............i just ordered mine also same exact setup crazy.

transam69230

iTrader: (49)

So I need a series two carrier. I called MTI and they said that i just need to order the ring and pinion. No instal kit except the gasket for the griddle cover

HotRodNeil

I think you already have a series 2 carrier, if you have a 2.73 or maybe even a little higher. You absolutely want to check this out first. If you do have a series 3, just order the ring & Pinion for that. Real easy.

99z20ate

iTrader: (1)

if u dont know what gears u have, on the inside of the door theres 3 stickers, the top sticker is the one u want to look at, somewhere in the middle of it, u will either see gu2, or gu5. Gu2 is 2 series 2.73, gu5 is 3 series 3.42. So if u have 2.73 get 2 series. Its also probably a good idea to get the install kit, ive heard that when u take the old gears out, u can ruin the bearings and stuff.

s346k

iTrader: (4)

going from a 273 to a 373 got me 1.5 mph and .25 et @ the track, no other mods. my 60' was about the same, it just picked up everywhere else. (car is stock, also) with mods i'm sure those numbers would increase.

HotRodNeil

I got .25 from my dual-dual, and then got another .25 from the FTRA. If I get .25 from the 3.73, I'll be down in the 12's. Those .25 seconds really add up!! If I lost some weight, that would be more (keep dreaming).

transam69230

iTrader: (49)

I know i am trying to figure this **** out before i buy. I have a series two carrier because right know i have 2.73's. So what i need to buy is a series 2 carrier 3.73's and what install kit just basic one or the expensie one? .

I think if get gears i can get down to low 13's i headers and custom 2.5 exhaust and a MTI lid. I ran a 13.7 at the track at like 80% humidy and 80 plus degrees outside.

HotRodNeil

Then you only need the "thick" ring & pinion gears 01-875373X 3.73 Ratio (Thick), and the install kit - contact Strange for this. Please double check these numbers.

http://www.usgear.com/us_strange.htm

transam69230

iTrader: (49)

Okay so how much for everything and were do i buy?

Ouija

iTrader: (3)

While I was changing out my gears I went ahead and did a complete rebuild.

No reason to mess around. You are in there, and the parts are cheap.

Pick up the full kit with races and bearings all the way around.

You will end up getting 2 axle seals, 2 axle bearings and races, one pinon seal, inner and outer pinon bearings and races, shims & a crush collar.

Thunder has a full kit it's their expensive one, usually about $200

I went ahead and slapped on a reinforced Diff cover and preloaded studs.

I think I spent $200 on install kit, $100 on the cover, $20 on the studs, $200 for installation, and $200 on gears. Little misc costs like fluid additive etc. Around $700 for me. Most shops here charge abotu $350 to install it all if you give them allt he parts.

transam69230

iTrader: (49)

Damn that seem really expensive for gears. Is it really worth it i mean you lose mpg, and then you have to have a tune. And what you gain like .2 of second or your 1/4. Not that i don't want gears any little bit helps to kill another honda.

99z20ate

iTrader: (1)

i order through one of the sponsors on the site, www.flp2win.com. I got the 2 series 3.73 gears and install kit with everything u need for a total of 350 bucks with shipping. And the shop i have doing it is charging me around 250-300 bucks for install.

Ouija

iTrader: (3)

I did gears, stall and nitrous at the same time. Already own HP tuners, and without modifying my tune I saw a 1.3 sec gain & 10MPH, but I lost 5HP on the Dyno (NA).

HotRodNeil

That's very interesing. The stall and gears won't change HP, but the nitrous does. How can this be? What shot nitrous were you using?

Ouija

iTrader: (3)

From my understanding gears do eat up HP. The guy running the dyno said he's lost 15 HP on a viper that he had done just the day before.

My NA Pull before everything was 345ish, and after gears and stall was 340ish.

With Nitrous it pulled 413/415

I still have some tuning to do for the 100 shot.

HotRodNeil

The only time I've heard of the gears eating HP was with a 9". Is that what you have.?

Ouija

iTrader: (3)

Believe it or not HP loss when changing gears is a common thing. There's actually a wonderful discussion going on about it right now over here:
https://ls1tech.com/forums/gears-axles/370931-power-drop-when-going-3-42-4-10-a.html

And no, I dont' have a 9" or 12 bolt. We can discuss this more over there if you want to, since we're hijacking this thread.

HotRodNeil

You're a good man! Thanks for the pointer.