2.8 front axles same as 1.8t?

[werewolves182]

Like the title states, are the front axles from a 99 2.8 Manual trans the same as the front axles from a 99 1.8t Manual trans?

Ive got the opportunity to pick up a set re-manufactured 2.8 manual front axles for $50 a pop, want to make sure they will fit or if I need 1.8t axles.

Thanks in Advance!

[werewolves182]

C'mon guys, I know someone knows the answer to this. Of course they are going to be different part numbers from Audi but are they really any different? Especially since the 2.8 Manual trans is a direct bolt up. The only thing that would have to be different is the spline that goes into the hub, and I'm doubting its any different. Just would like someone to confirm my suspicions.

[Kyle H]

I'd call up purems or 034motorsport or even raxles and ask them directly since you're not getting an answer on here.

I'm pretty sure they're the same though. There is a difference in one of the model updates... I think in 99.5 they changed them. But don't quote me on that!

[gmx]

C'mon guys, I know someone knows the answer to this. Of course they are going to be different part numbers from Audi but are they really any different? Especially since the 2.8 Manual trans is a direct bolt up. The only thing that would have to be different is the spline that goes into the hub, and I'm doubting its any different. Just would like someone to confirm my suspicions.

That is exactly the difference.

While you're there, get a set of hubs, uprights, lower CAs, and bolt on S4/RS4 brakes

[werewolves182]

That is exactly the difference.

While you're there, get a set of hubs, uprights, lower CAs, and bolt on S4/RS4 brakes

Are you certain of this? (not insulting your knowledge btw)

Might was well just get 1.8T axles in that case. No need for S4 brakes when Ive got Porsche 4-pot calipers that i'm making brackets for to use S4 321mm rotors

[gmx]

No direct knowledge.

From my notes required for a S4 front end conversion (my car is also 99.5+)
Caliper
B6 A4**/RS4/S4 Uprights
A4 2001/2.8Q 98-01 axles Right
A4 2001/2.8Q 98-01 axles Left
RS4/S4/2.8 Hub
S4 wheel bearings
RS4/S4 Lower Control Arm


From that info, I infer
The 2.8Q and 1.8TQ CV flanges are 100mm.
FWD/S4 are 108mm.

The difference comes when the axle splines from 2001 A4s/2.8Q (98-01) will not match up.

More info here (they're all talking about brake conversions but info is applicable)
http://audizine.com/forum/showpost.p...7&postcount=12
http://audizine.com/forum/showpost.p...13&postcount=9
http://audizine.com/forum/showpost.p...8&postcount=29


In short, for your application, it is wiser to just stick with pre 2001 A4 1.8TQ axles.

[werewolves182]

I understand what your saying. That in some good information as well. So basically 2001 A4 1.8TQM axles are the same as 2.8QM axles however pre 2001 1.8TQM axles are needed for all 1.8TQM applications prior to 2001.

Thanks for the help!

[ghost6303]

as long as you match manual to manual and quattro to quattro (or fwd to fwd) they should be the same size. the FWD 5 speed 2.8 axles are the same as the 6 speed S4's. auto transmissions are wider so their axles are shorter. if you are unsure just match part numbers. if they are different part numbers listed for different cars, most likely they wont fit.

[werewolves182]

Just had an idea...Would it be possible to use 2.8QM front axles BUT swap the outer CV's with my current axles in order to retain the outer splines necessary to bolt up on a 1.8t cars hubs?

[biketsai]

I do not believe they are the same for that year.

[Tifun]

have you not tried to cross reference parts on like autozone or whatever to see if the share the same number?????

[Militant-Grunt]

Just had an idea...Would it be possible to use 2.8QM front axles BUT swap the outer CV's with my current axles in order to retain the outer splines necessary to bolt up on a 1.8t cars hubs?

You can use 2.8 axles with S4 uprights or with 2001+ 1.8t uprights. The 1996-2000 1.8t hubs were all small, using toothpick like axles. The actual rod on the axles is bigger as well, you wont be able to swap the joints.

[werewolves182]

have you not tried to cross reference parts on like autozone or whatever to see if the share the same number?????

I have done that. The parts are not the same number through Audi or autozone. I know they are different but we all know there are often parts that fit our cars but aren't made for our cars if you know what I mean.

You can use 2.8 axles with S4 uprights or with 2001+ 1.8t uprights. The 1996-2000 1.8t hubs were all small, using toothpick like axles. The actual rod on the axles is bigger as well, you wont be able to swap the joints.

Gotcha, that answers my question. And to think I was trying to figure out something less expensive...psshhh silly me, I own an Audi after all.

Thanks for all the help everyone!

[zrowcool]

I know this is an old thread but my question is on the subject. Whats the difference btwn the 2.8l left and right axles? Is it the length or are they switchable? A local parts shop can get me the right side by today but i have to wait 3 days for the left one. I need the left one so i want to know if the right side would fit. Thanks.

[onemoremile]

The V6 also has a larger wheel bearing than any 1.8t before 2001.

[alen]

Are you certain of this? (not insulting your knowledge btw)

Might was well just get 1.8T axles in that case. No need for S4 brakes when Ive got Porsche 4-pot calipers that i'm making brackets for to use S4 321mm rotors

how are you going to fit those S4 rotors on the pre 2001 1.8tq hubs?

[alen]

as long as you match manual to manual and quattro to quattro (or fwd to fwd) they should be the same size. the FWD 5 speed 2.8 axles are the same as the 6 speed S4's. auto transmissions are wider so their axles are shorter. if you are unsure just match part numbers. if they are different part numbers listed for different cars, most likely they wont fit.

Do those two statements conflict each other?

[werewolves182]

Alen- rotors are rotors just as long as they have the same bolt pattern and you have a plan to make the calipers, or in my case Porsche calipers fit the larger rotors. Same reason why you can use D2 A8 rotors on out cars with the support of the TT caliper carrier.

Also, to clarify the axle ordeal..
- Automatic axles are different than Manual axles in length
- S4 axles= 2.8 axles= 2001 1.8t axles
- I believe the left is just slightly shorter than the right

[mike-2ptzero]

S4 front shafts are hollow and twist like candy. lol

[alen]

I guess my question was: how are you going to fit the S4 rotors on your 1.8t? Via S4 uprights and 2.8q axles?

[onemoremile]

The S4 rotors are a direct bolt on. Actually, they slide on. You just need calipers capable of dealing with their added width and diameter.

[werewolves182]

Alen- Jim hit the nail on the head, that is exactly what I am doing with the S4 rotors and to compensate for the larger width and diameter I am utilizing Porsche 944 turbo calipers with custom brackets.

[alen]

so you can fit the S4 rotors on the smaller 1.8t hub?

[werewolves182]

Yes, S4 rotors will fit just fine on the smaller 1.8t hub. You just need to have the caliper mounted farther out to clear the larger rotor.

[nyca4tqm]

S4 rotors fit...this is a 98 a4 1.8tqm with s4 rotors

[onemoremile]

S4 rotors fit...this is a 98 a4 1.8tqm with s4 rotors

With those calipers? The S4 rotor is thicker than ours and needs that monstrous HP2 caliper.

[audi til I die]

S4 rotors fit...this is a 98 a4 1.8tqm with s4 rotors

Thats news

[Militant-Grunt]

That's not a S4 rotor. That's a A8 rotor.






Notice how much of the wheel that rotor fills on a 18" wheel.

[werewolves182]

I thought something looked funky about the previous picture. Plus I know the B5 S4 rotor is 321x30 where as the D2 A8 rotor is 312x25. Deff need something other than the stock A4 caliper to clear a B5 S4 rotor.