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Old 10-13-2021, 11:17 PM   #1
cwojcik
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Default Quaife QDH3Y 5MT axle positions

So I am getting my 05 Legacy GT (5MT) back together with a fresh transmission and a Quaife QDH3Y front LSD. However, I have noticed that the passenger side (right) axle does not go as far into the trans as the drivers side (left).



I measured the position of the snap ring groove inside of the differential and noticed that it was a few mm further out than on the stock differential. In speaking with Quaife, they sent me an outline drawing of the differential. This actually showed the passenger side snap ring groove 4mm closer to the bearing shoulder than on the drivers side (which would result in the axle further out). I am concerned about the axle seal leaking because the axle is not fully seated.


Has anybody else run into this issue? I feel like the only other people who try to run this diff in a 5MT are the 818 guys, and their cars never get finished anyway.
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Old 10-16-2021, 11:22 PM   #2
Unabomber
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Aftermarket front diffs are as rare as hen's teeth, so you likely won't get the answer you want.
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Old 10-17-2021, 08:51 PM   #3
cwojcik
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I got the car all back together and took it for a test drive. It drives great, but the seal does leak a little on that side. I am going to machine a bigger seat in the sundial and press in a larger seal in the right position.



Quote:
Originally Posted by Unabomber View Post
Aftermarket front diffs are as rare as hen's teeth, so you likely won't get the answer you want.

I think you are right. The fact that such a big flaw has gone unnoticed for the duration of the product's life means very few people are using them in a 5MT.
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Old 10-18-2021, 03:10 PM   #4
JarHarms
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QDH3Y isn't just 5MTs it is also called out for 6MTs. Only difference is the need to install the 6MT's VSS drive gear prior to pressing on the bearing. That said; I had no problems installing and using my QDH3Y on a 6MT with WRX male-type front axles. No oil leaks with male-type seals installed per FSM. Axles on both sids seated as I expected them to. Hmm. So I am not sure what could be different in your setup. Other than the 5MT.
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Old 10-18-2021, 03:20 PM   #5
cwojcik
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Quote:
Originally Posted by JarHarms View Post
QDH3Y isn't just 5MTs it is also called out for 6MTs. Only difference is the need to install the 6MT's VSS drive gear prior to pressing on the bearing. That said; I had no problems installing and using my QDH3Y on a 6MT with WRX male-type front axles. No oil leaks with male-type seals installed per FSM. Axles on both sids seated as I expected them to. Hmm. So I am not sure what could be different in your setup. Other than the 5MT.

The QDH3Y can be installed in 5MT or 6MT, only difference is the 6MT gets spacers between the bearings and bearing shoulders and the 5MT does not.

https://i.imgur.com/trjMuCI.png

However, with the spacers in the 6MT, the passenger's side axle does stick out a little further than the driver's side, just like on the 5MT. However, the difference is about 1mm, which the seal can probably absorb without leaking. But it can't absorb 4mm on the 5MT.

Edit: copy and paste the link. I can't embed the picture any other way.
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Old 10-19-2021, 11:22 AM   #6
JarHarms
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Interesting. I bought mine out of box and never installed. No bearing spacers so those are not in my 6MT but those dims checked okay against the OEM diff carrier. Hmmm.
I hope you get it sorted out man. Good luck.
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