carreras

iTrader: (7)

A friend just gave me some new 3:42's still in the box and was thinking about giving them to another buddy who could use them. Would they fit his A4 95 Formy? Are the ls and lt rear ends the same?

davidv

i think its the same rearend not sure.

Formula383

iTrader: (8)

You need to find out which carrier he has and which carrier the gears were made for. I would imagine an A4 Formula would have a 3-series carrier but you need to verify that. Do you know what gears he has now? 2.73 or 3.23?

carreras

iTrader: (7)

im not to sure what gears,carrier he has? how can we find out?

Formula383

iTrader: (8)

Look at this thread or do a search for axle codes.

https://ls1tech.com/forums/showthrea...es#post4517026

GU1 : AXLE REAR, 2.41 RATIO
GU2 : AXLE REAR, 2.73 RATIO
GU4 : AXLE REAR, 3.08 RATIO
GU5 : AXLE REAR, 3.23 RATIO
GU6 : AXLE REAR, 3.42 RATIO

Look on the driver side door for one of these codes. If it's a GU5, it' should be a 3-series.

carreras

iTrader: (7)

will do as soon as i get home. thanks

Formula350

iTrader: (3)

Yea gears for series 3 carrier (3.23 and up) work on all 10-bolt rears to my knowledge. At least we'll see if they do heh Friend is putting 4.10s from a 99 S-10 on my old 10-bolt posi carrier.

carreras

iTrader: (7)

ok the door sticker has been painted over but in the glove box it has a GU5. I can get the vin# if it would help. And the gears came out of an 2000 SS.

infinitebird

iTrader: (11)

They will work fine then.

Although, you probably won't notice much difference going from 3.23 to 3.42. Might not be worth the hassle of changing them out.

carreras

iTrader: (7)

well we both work at a local gm delership so the only cost would be in parts. what else would i need to put them in.

infinitebird

iTrader: (11)

Nothing else as far as parts. You have to have several specialized tools to align them properly when you do the install. I'm sure a dealership would have all that.

carreras

iTrader: (7)

coll thanks for the help. ill let yall know how it goes.

SLawson86

iTrader: (8)

not to be a dick, but if you dont know what all you need to do a gear swap/rearend overhaul then why would you attempt it? its not one of those parts you can just throw in and drive out... there is alot of measurement there. this is coming from a GM tech, i sure hope you have some help to walk you through it man...

carreras

iTrader: (7)

i never said i was doing the work. Im only 22 and dont have enough experiance yet. A older tech who has done mainly tranny's and rear's for about 15 yrs. said if i had everthing he needed he would do it free to help my buddy out. Trust me i have seen it done and i would never attemt to something like that, at least not without an experienced supervisor there with me. i just want to make sure that when he gets started he dont have to wait for something that we forgot to get.

Formula350

iTrader: (3)

Well I just got 3.42s in my car from 3.23 and the little bit I drove it (bad rim, didn't want to thrash on it yet) I could tell. It's kinda like doing a small free-mod or underdrive pulley. It's nothing huge, but it's noticeable.

carreras

iTrader: (7)

Exactly.
gears - $free
labor - $free
what else can you ask for, i think it is going to be worth it.

LoStOCeAnZ63

i just checked my car and its a 95 firebird the guy that had the car before me changed the car to a auto so i got 342 gears in the back i just noticed that i got the car last week autos use alot more gas then my 6 speed camaro did