Gear ratio question who's running what..??

[ManMuchwano93Z28]

Hey guys so I'm looking into getting some gears on a A4... I have 3.23 in there right now.. And I was looking at eaither 3.73 or 3.89 my Carrier is a 3 series so I just wanted some insight on who is running what gear and also what brand and install kit should I get I heard Richmond and motive are good

[jaysz2893]

I have 3.73 with Eaton in a 10 bolt. Fun with the 6 SPD. I was 3.23. I ran a 12.88 with the new rear... but I hurt it... back to the 3.23 for a while

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[Sahara54]

Usually, rule of thumb is 3.73's for auto, 4.10's for 6spd. They'll also last a lot longer behind the auto. 6spd's are hell on rears if you don't treat er' right.

[jaysz2893]

Usually, rule of thumb is 3.73's for auto, 4.10's for 6spd. They'll also last a lot longer behind the auto. 6spd's are hell on rears if you don't treat er' right.
I have the m29 t56 so the 3.73 was a good compromise so1st gear would still be usable. 3.90 is about as big as i would go with a m29 t56 6 speed and yeah, 6 speed beats up even "strengthened" rears.. LOL
Since OP has an A4 3.90 would be fine compromise for "spirited" driving. FWIW my gears are Richmonds..

[JCzNova]

I am running 3.73's in a Ford 8.8 posi. A4. Ran a best of 12.92 so far with some decent wheel-hop off the line.

[ManMuchwano93Z28]

Anyone running 3.90 gears.. Cause my car is full bolt ons with stock milled heads and a lt4 hot cam if I go 3.73 it should be like 12.8 12.9 ish My car ran a best of 13.1 with 3.23 in it on a nitto 555r

[DMBlack]

I am running 3.90 gears in my bolt-on only car. With a 26" tire it runs well at the track.


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[JCzNova]

Anyone running 3.90 gears.. Cause my car is full bolt ons with stock milled heads and a lt4 hot cam if I go 3.73 it should be like 12.8 12.9 ish My car ran a best of 13.1 with 3.23 in it on a nitto 555r

Was that time with the milled heads and hotcam? What was your 60' looking like?

[96lt1m6]

6speed, bolt ons, 4.10s, great tune 12.98@106 3000'+ .... 96 z28
New set up in the back 40 is Cam,heads,freshend shortblock, 4L80e,3800stall,8.8 w/3.73s 93 TA

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[Dangerous95lt1]

3.50 gear QP 9 inch.
7.93 at 89 on motor

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[ManMuchwano93Z28]

Was that time with the milled heads and hotcam? What was your 60' looking like?

Yes it was my 60 ft was 1.9

[ManMuchwano93Z28]

Any one else have any more info about the 3.90's cause I'm going back and forth from 3.90 to 3.73 leaning more towards the 3.90's my car is stock suspeion.. I been reading some forums and from what I seen the 3.90's will need some suspeion to stop the wheel hop

[Still2slow]

When mine was a bolt-on stalled A4 with a 3.73 my best was a 12.9x at 104.5mph. If you don't plan on spraying and aren't worried about a few hundred higher rpm on the highway I think 3.90 is a great option. When I was spraying a 175 shot on the stock motor (with 3.73's) it would top 3rd gear before the end of the 1/4 on 17" nitto DR's on ZR1's, coasting to 11.6x's. These times were before the cam, blower, t56 swap, 12 bolt, etc

Do you have a stall yet? If your stock suspension I recommend subframe connectors, LCA's and relo brackets to plant the rear. I always remove the front swaybar for track trips too.

[ManMuchwano93Z28]

When mine was a bolt-on stalled A4 with a 3.73 my best was a 12.9x at 104.5mph. If you don't plan on spraying and aren't worried about a few hundred higher rpm on the highway I think 3.90 is a great option. When I was spraying a 175 shot on the stock motor (with 3.73's) it would top 3rd gear before the end of the 1/4 on 17" nitto DR's on ZR1's, coasting to 11.6x's. These times were before the cam, blower, t56 swap, 12 bolt, etc

Do you have a stall yet? If your stock suspension I recommend subframe connectors, LCA's and relo brackets to plant the rear. I always remove the front swaybar for track trips too.

Ya I have a 2800 stall I hate the gears I have now 3.23 when u hit 3rd it just falls on it face lol but it's also a daily driven car

[Still2slow]

If its your DD I'd go 3.73, good track performance without too high of rpms on the highway. I ran gm motive gears in my 7.5 and have motive 3.73's in my 12 bolt.

[Still2slow]

Has your car been dyno tuned? What elevation/da are you running down the track at?

[popo8]

When I bought my ex a 95 z28...it was an a4... Put 4.10s in it...and it was a blast!!

Co-Owner/Admin @ LTXtech.com

[ManMuchwano93Z28]

Has your car been dyno tuned? What elevation/da are you running down the track at?

Ya it was dyno tuned by mad tuner put down 302 rwhp 310rwtq and I have no idea what elevation I'm in. I live in Illinois/Wisconsin border I go to Great Lakes drag way in union grove wi And I have a stock 10 bolt forgot to mention that lol

[ManMuchwano93Z28]

When I bought my ex a 95 z28...it was an a4... Put 4.10s in it...and it was a blast!!

Co-Owner/Admin @ LTXtech.com
I bet first gear felt like it would do a wheelie lol

[popo8]

I bet first gear felt like it would do a wheelie lol

Had 19" c6 wheels on it with hard ass 295.....

It was like driving on butter anytime u hammered it. Fun¡¡¡

Co-Owner/Admin @ LTXtech.com

[ManMuchwano93Z28]

Had 19" c6 wheels on it with hard ass 295.....

It was like driving on butter anytime u hammered it. Fun¡¡¡

Co-Owner/Admin @ LTXtech.com

Did u ever take it to the track

[popo8]

Did u ever take it to the track

No


;(

Co-Owner/Admin @ LTXtech.com

[ManMuchwano93Z28]

No


;(

Co-Owner/Admin @ LTXtech.com

What other mods did it have... And I think I'm gonna go with 3.73 now

[ManMuchwano93Z28]

When mine was a bolt-on stalled A4 with a 3.73 my best was a 12.9x at 104.5mph. If you don't plan on spraying and aren't worried about a few hundred higher rpm on the highway I think 3.90 is a great option. When I was spraying a 175 shot on the stock motor (with 3.73's) it would top 3rd gear before the end of the 1/4 on 17" nitto DR's on ZR1's, coasting to 11.6x's. These times were before the cam, blower, t56 swap, 12 bolt, etc

Do you have a stall yet? If your stock suspension I recommend subframe connectors, LCA's and relo brackets to plant the rear. I always remove the front swaybar for track trips too.

Hey just wondering with 3.90's would I bounce the Rev at the quarter mile it bounces the rev at 6400 or I wouldn't even be close to hitting it.. I really can't find anyone running the 3.90 gear and since I have to wait until Monday to actually place a order I just wanna get as much info as I can about the 3.90 and also I'm running a 245 50 16. Nitto 555r drag radials.. Sorry guys for so manny post I'm the kinda person that likes to do alot of research in everything.. And I'm also new to lt1 cars Im only 18 and had my car for a year

[Still2slow]

You would be fine in the 1/4 with a 3.90 gear as I'm guessing your car is trapping 105-106 mph.

[popo8]

What other mods did it have... And I think I'm gonna go with 3.73 now

Lol... I made u go the other way...

It was a fresh build... Mild cam from previous owner...exhaust...and that was it.

Co-Owner/Admin @ LTXtech.com

[ManMuchwano93Z28]

You would be fine in the 1/4 with a 3.90 gear as I'm guessing your car is trapping 105-106 mph.

Ya it was trapping at 105 with the 3.232 gear.. Where does the rpm go after you shift at 6200 cause I was looking at my dyno chart lastnight and my Max Tq came in at 4500. Rpm

[ManMuchwano93Z28]

Lol... I made u go the other way...

It was a fresh build... Mild cam from previous owner...exhaust...and that was it.

Co-Owner/Admin @ LTXtech.com

Lol like i said I have until Monday.. And I'm not gonna get 410 but. 3.90 is pretty close and is pretty much the same at least that's what people are saying that had them both

[96lt1m6]

You will love either 3.73 or 3.90 seat of the pants you will not notice the difference and as for the 1/4 mile difference is so small...can't go wrong.

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[DMBlack]

My car does not hit the limiter at the traps with 3.90 gears and a 26" tire. It traps 105-106 N/A but I would have to check what it traps on the 150 shot. I would have to check, but I believe my limit is set at around 6500.

[ManMuchwano93Z28]

My car does not hit the limiter at the traps with 3.90 gears and a 26" tire. It traps 105-106 N/A but I would have to check what it traps on the 150 shot. I would have to check, but I believe my limit is set at around 6500.

My car is n/a and not planning on spraying or boosting it

[95slowmaro]

lol, im running 4.10s with a homemade spool, behind a th350 with a 4K stall. AND I DRIVE IT EVERYWHERE. besides highways..........

[ManMuchwano93Z28]

lol, im running 4.10s with a homemade spool, behind a th350 with a 4K stall. AND I DRIVE IT EVERYWHERE. besides highways..........

Sweet probably feels like a rocket ship... I drive my car pretty much everywhere expect dirt roads lol

[ManMuchwano93Z28]

Pulled the trigger on some Richmond 3.73 and ratech full install kit today.. Thanks everyone for the help!!

[Paulster2]

If you have the ability, get the axle tubes welded to the center section.


lol, im running 4.10s with a homemade spool, behind a th350 with a 4K stall. AND I DRIVE IT EVERYWHERE. besides highways..........

I'm sure you pass everything but the gas station as well :D

[pa formula 78]

I am running 4.11's with a 6-speed also. Makes it pretty fun to drive.

[ManMuchwano93Z28]

I am running 4.11's with a 6-speed also. Makes it pretty fun to drive.
My cousin has a ls Trans am
With 4.11 it's great love driving it but that's he's race car not he's everyday car lol

[SexyTransAm]

Im running a stock 6 speed rear, 3.42 gears. When time comes to dump money into a rear ill be goin with a 4.10. My car is auto

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[ManMuchwano93Z28]

Im running a stock 6 speed rear, 3.42 gears. When time comes to dump money into a rear ill be goin with a 4.10. My car is auto

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Sounds fun let me know how she runs after