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View Full Version : Front Suspension/Steering/Hub: FWD vs Quattro



A4ski
12-13-2014, 10:05 AM
Good afternoon, Gentlemen.
I am considering the purchase of some used front end parts from a seller on the classifieds here, and before I commit, I'd like to be sure they will fit. The parts are both steering knuckles/spindle carriers, front cv axles and brake calipers. The parts are from a Quattro and mine is a FWD. One would naturally ASSUME that there is no difference in the front end parts, but I figured I'd ask the experts, seems to be the fastest way to get an accurate answer.
PS: yes, I know I should have gotten a quattro.
Thanks!

thedownwardsprl
12-13-2014, 10:10 AM
Spindles should be the same not sure about the cvs. They might be different if it is an automatic versus a Manuel but other than that should be fine

redline380
12-13-2014, 10:34 AM
The uprights do matter. The only part that is compatible with every scenario are the hubs. Brake calipers are different brands, but should be the same too.

Most importantly, we would need the years, engines, and drivetrains of all the vehicles involved.

A4ski
12-13-2014, 10:41 AM
Fair enough: Donor car is a 98 A4 Quattro, seller did not specify engine, but I'll ask him. My car is an 01 A4 Fwd 1.8 base model. Edit:Both are manual transmission

redline380
12-13-2014, 10:47 AM
Fair enough: Donor car is a 98 A4 Quattro, seller did not specify engine, but I'll ask him. My car is an 01 A4 Fwd 1.8 base model. Edit:Both are manual transmission

You'll have to wait until Walky sees this thread since he knows all the exact differences, but if the donor car is a 2.8, I can tell you the uprights and brake calipers will work, but I am not positive on the CV shafts. I think they will work

MetalMan
12-13-2014, 11:10 AM
There are several big differences for you here:
-ALL B5 A4 1.8TQM cars have the smaller 100mm inner CV joint. ALL FWD B5 manual cars have the larger 108mm inner CV joint. So those won't be compatible.
-In 2001, Audi included the larger 83mm outer CV joint and bearing to the 1.8T (FWD and Quattro). So the '98 1.8T will have the smaller 75mm outer joint and bearing. This means the spindles are also different.

So basically the only parts that will swap are the brake calipers... those are the same (I actually swapped calipers between my '98 FWD and '01 Quattro).

Your 2001 FWD is rather unique in the axle department. Its axles are only found on the 2001 A4 1.8T FWD manual ans B5 S4 manual. The spindles aren't too rare though, as they should be the same as any B5 V6 model or 2001 1.8T.

redline380
12-13-2014, 11:16 AM
So the '98 1.8T will have the smaller 75mm outer joint and bearing.

I thought all FWD were 82mm bearings?

A4ski
12-13-2014, 11:22 AM
Cool, thanks for the input, fellas. Just to simplify, I am not that interested in the axles or calipers, what I really want from the guy is the steering knuckles. Will all this spindle and cv joint difference affect the fitment of those? They're ridiculously expensive to buy new, and I'd like to have a set I can clean up and have ready to go in when I do my whole front end this spring.

redline380
12-13-2014, 11:26 AM
The thing is that all steering knuckles are pretty much the exact same, 2.8, 1.8, and S4. Except, S4 uprights have different mounting points for the caliper than A4's. They also use 82mm bearings. 97-00 1.8t quattros use 75mm bearings. 2001 1.8ts use 82mm bearings. I am not positive on the 2.8's though.

A4ski
12-13-2014, 11:35 AM
Well, now the seller emailed me back and says it's a 97 A4 1.8 quattro. Sounds like the bearing difference makes this a no-go?

walky_talky20
12-13-2014, 06:10 PM
I thought all FWD were 82mm bearings?

Nope.

*for 5 speed manual trans b5's*

FWD vs Quattro specifies the INNER joint size. (Fwd = 108 or 130, Quattro = 100)

Original factory horsepower specifies the outer joint/bearing size. (150hp = 75mm, All else = 82mm)

OP, you are correct. It's a no go because of the bearing size. Best to keep the correct equipment on the car.


Sent from my iPhone using Tapatalk

A4ski
12-14-2014, 06:03 AM
See, this is why I check these things first. Figures, I get the one oddball version of the most popular Audi. Thanks for the input, fellas. You probably saved me some serious cheese here. If you're ever in the Cleveland area, I'll buy ya a German beer.