rear diff rebuild

[lovintheboost]

i posted a while back that there was a noise comeing from the rear of my car. well i took it in and i need the rear diff rebuilt anyone had yjis done or know what i should be paying? its sounding like around $800.00

[onemoremile]

Sounds like a good time to try out the $150 V8 rear LSD.

[smoothie]

has it been done before??

[b00st]

i just had the rear diff seals done....cost me 400.

[audispeed]

Sounds like a good time to try out the $150 V8 rear LSD.

what is this? i only knew of the $2k stasis option, but i guess i havent really looked into it.

[lovintheboost]

hey onemoremile more info please
i've only heared of the big bucks one from stassis as well. if you have some specifics or any place i can start some research that would be great. its funny you probably have no idea how muchinfluence you have had on my car. back in the day you helped me with my first track day to my recent chouce to gut and cage my car and i just decided not to buy a set of crobeau forza in favor of a set of kirkeys (which i had never heared of untill you suggested it

[lovintheboost]

i just had the rear diff seals done....cost me 400.

my rear diff isnt leaking so i think the whole thing has to be rebuilt its pretty damn loud above 35mph

[audispeed]

hey onemoremile more info please
i've only heared of the big bucks one from stassis as well. if you have some specifics or any place i can start some research that would be great. its funny you probably have no idea how muchinfluence you have had on my car. back in the day you helped me with my first track day to my recent chouce to gut and cage my car and i just decided not to buy a set of crobeau forza in favor of a set of kirkeys (which i had never heared of untill you suggested it

beat you, lol

[lovintheboost]

^ya really
150 bucks sound to good to be true i wonder what all is involved

[Daft]

i just had the rear diff seals done....cost me 400.

OMG!! $400!? Was it $200 per hour? That's a ton of cash to replace two $4 seals.

I'll admit that it does require a few tools and some patience but, damn!

[ShawFM]

has it been done before??

Give me some time, I am thinking about trying it out. I need to replace my rear seals. I was looking the LSD has actually been going for ~$250-400 at most places that I have checked.

[lovintheboost]

where did you find them? and what additional parts do i need im looking to replace my diff in the next month so if anyone can help me with info id appreciate it

thanks

[onemoremile]

So far it is an unsubstantiated rumor. I've read that it works and that several people have used it but have no direct information on it. I've been wanting to try it.

[b00st]

OMG!! $400!? Was it $200 per hour? That's a ton of cash to replace two $4 seals.

I'll admit that it does require a few tools and some patience but, damn!

front and rear so maybe 200 for each...dunno but it was expensive. i was say they charge 100 bucks an hr. its a top notch shop and i would bring my ride back in a second.

[smoothie]

no kiding that would be an awsomly cheap deviation from the stasis unit. worth a shot if your looking into a new rear end if any info on this arises let us know, I'm very interested :)

[lovintheboost]

anyone know where to source one?

[ShawFM]

anyone know where to source one?

car-part dot com search "carrier" for 1990-1994 V8 Quattro. I bit the bullet last week and ordered it $150. I figured that if I am going to pull the seals on the rear diff, I may as well have the V8q diff here for measurements and comparison. It will be several weeks before I really do anything. I still have to install the rest of my k04 and exhaust.

[Tiluleshpingen]

WOW.. 150 man am ready to pay 300 for the rear diff. its the whole thing?.. i guess the V8 LSD should be better then what we currenty run, considering we ahve 96 and up A4? . so you guys think this is a good idea to be doing on our cars?

[onemoremile]

car-part dot com search "carrier" for 1990-1994 V8 Quattro. I bit the bullet last week and ordered it $150. I figured that if I am going to pull the seals on the rear diff, I may as well have the V8q diff here for measurements and comparison. It will be several weeks before I really do anything. I still have to install the rest of my k04 and exhaust.

Awesome. If the rumors are true about this diff fitting then a whole lot of folks are going to follow in your footsteps.

[ShawFM]

And if they are false.... I lost $150

Awesome. If the rumors are true about this diff fitting then a whole lot of folks are going to follow in your footsteps.

[lovintheboost]

did you get the whole diff for 150? whats additional parts do you think will be needed

[ShawFM]

I don't know yet. I just ordered it on Wednesday. I should have it sometime next week. Still haven't picked up a new digi cam so no photos of what I will get just a description.

did you get the whole diff for 150? whats additional parts do you think will be needed

[ShawFM]

I got the whole rear diff and housing for the $150. Just arrived today. Quick assesment of physical size: won't fit the A4, crack the housing open and pull the TorSen diff out, a thing of beauty, the V8q housing has a bit of fluff to it. the TorSen is small enough to possibly fit into the A4 diff housing. This is where it will require dismantling the one on the car to say yes or no. Now the weather comes into play, I am in Chicago and it can get cold. So, it may be a while before I work on it. But it is in excellent condition.

did you get the whole diff for 150? whats additional parts do you think will be needed

[ShawFM]

A short E#TA search right seal is the same, right tapered roller bearing is the same, left side is not. The flange shaft (the part that bolts to the axle) is different the V8 is a 108mm flange the A4 is a 100mm flange. Have not checked to see if the splines are the same.

[ShawFM]

I found the Quaife technical drawings online, I can do a comparison on the V8 differential with the drawing for the differential from Quaife that does fit into the A4 This makes things a lot easier. It includes everything we need to know dimensionally, including the number of splines on the shaft.

[lovintheboost]

i will be taking notes keep the updates coming man

[LateraLex]

Very interested in how this turns out

[ShawFM]

Me too, I hope I don't end up biting the $150. But the left side bearing looks like it might be the sticking point, the V8 is I.D. 45.2mm x O.D 77.8mm the A4 is I.D. 41mm x O.D. 68mm I will need to either locate a bearing or price machine work to for this to work. Also take note of what other car the quaife is used in...
D3/A is the problem

Very interested in how this turns out

[onemoremile]

http://www.quaifeamerica.com/differe.../diff_apps.htm

Quaife lists the 40.309.170 as fitting the following:
Audi Rear: A4 Quattro (B5), incl S4
Audi Front: Coupe GT, 4000 Quattro, Quattro Coupe (016/093 trans)
Porsche 944 1986 on including turbo (add'l parts may be required)

The additional parts note for the 944 is as follows:
nstallation Note for 944 Application:
Models with both transmission oil cooler AND open (non-LSD) differential will require the bolt-on type pump drive gear from a limited slip vehicle.
Parts required:
016.115.165 gear
999.119.011.00 screw (4 req)



I had heard of some folks running the 944 rear LSD so this is promising.

[onemoremile]

http://forums.audiworld.com/a4/msgs/2435131.phtml

-the 944 diff fits in our rearend?
-Yes, with some very minor machine work... (Audii-Dudii)
In fact, the LSDs that Stasis originally sold were made by Guard Transmission for the 944. I don't know if they spec'd them any differently, though, and I understand they are now selling units either made by them or made to their specs.

FYI, ZF is the OEM source for the LSDs installed in many european cars. Although the side gears usually have different splines and cannot be easily interchanged, economies of scale dictated that most of the other internal parts be shared among the various diffs ZF produced for several different manufacturers.



For instance, I'm using the thrust plates from an E12 BMW LSD in my setup since they have steeper ramp angles (45/45) than Porsche used (30/30, as shown in the photo above) -- this causes it to lock-up less under load (25% v. 40%), something that's beneficial for a car that understeers -- and stiffer Belleville washers to increase the preload on the clutch discs, which is all that keeps the inside rear wheel from spinning when it's in the air, turning AWD into ZWD.

I haven't yet done a back-to-comparison (but eventually intend to, which is why I bought a second 944 LSD and A4 rear diff) but theory suggests this is a better setup for our front-heavy AWD cars and the results so far have been encouraging.

[onemoremile]

Another great post with a link to info on the Porsche rear diffs:
http://forums.audiworld.com/a4/threa....phtml#2482450

Another on the rear diffs:
http://forums.audiworld.com/canada/t...71.phtml#50500

Link to pic of a disassembled Torsen:
http://pictureposter.audiworld.com/6...sassembled.jpg
^^ You'll probably have to cut and paste it into the browser to get around the AW photo sharing issues.

[onemoremile]

More info on the ramps and whatnot:

I bought mine on eBay for around $400 but had to rebuild it...
Posted by: Audii-Dudii on 2006-10-17 10:46:58
Account #: 69143

and in the process, I swapped the Porsche's OEM thrust plates with 30/30 ramps for the thrust plates with 45/45 ramps out of an old E12 BMW 530i LSD I had lying around. I'm told the thrust plates from an Alfa Montreal have 30/45 ramps, which is probably the best combo, and they're even supposed to fit the Porsche diff housing as well, but I've never come across a used Montreal diff for sale so I can't confirm or deny this.

I acquired another BMW 530i LSD and an A4 rear diff housing late last year and had the 45/45 ramps remachined to 30/45 but I don't have any experience with this setup yet. I did drive the car briefly with the OEM Porsche thrust plates and thought this setup made the car push too much at corner entrance.

[ShawFM]

I remember that, I just forgot about it. I recall searching for a reasonably priced 944 LSD and could never find one. Now in search of a new / cheaper holy grail
[QUOTE=onemoremile;1320160]http://forums.audiworld.com/a4/msgs/2435131.phtml
-the 944 diff fits in our rearend?
-Yes, with some very minor machine work... (Audii-Dudii)QUOTE]

[lovintheboost]

what is the diff code for a 97 1.8t quattro? "daj" or "dak"?

[ShawFM]

Both are good codes for a '97 you need to check the differential or the build sticker for which specific diff you have. but it seems the DAK shows up on a lot of auto;s when looking on car-part dot com

what is the diff code for a 97 1.8t quattro? "daj" or "dak"?

[lovintheboost]

looked on the diff no code. where is the build sticker?

nevermind found it "daj" if anyone was curious

[vitaliko]

im looking to switch rear diff out on my a4 in the near future keep this up

[ShawFM]

The V8 torsen WILL need to be machined. One diameter D3/A from the drawing posted is 45.2mm on the V8 needs to be machined down to 41mm. I haven't been able to check overall width when the flange shafts installed. I want to do that before I spend any more money on machining this. This will have to wait a couple months, as it is now a little cold in Chicago. But the 944 LSD is still an option for you if you can find one and don't mind a clutch pack rear diff.
I know I would like to get this working too, and in a hurry. When the EDL turns off at about 35-40 mph if it is wet out and I am in boost the rear tires now break free way too easily.

im looking to switch rear diff out on my a4 in the near future keep this up

[vitaliko]

btw how da fuck do you get rid for the EDL??

[onemoremile]

EDL has nothing to do with the differential. It senses speed variations through wheel speed sensors and uses the brakes to slow down the spinning wheel. If you have a real limited slip diff then the EDL should activate less.