What to do after blowning a rear differential R36.

[Waah954]

Hi guys
Hope everyone is doing well.

After one s**t day with bad things going wrong left and right my rear diff just gave way while I was driving.

05/10 built R36 with 70k on it.

Where should I be looking to find a rear diff and what will be the damage.

Prompt replies are appreciated as I need to get this back on the road.

Thank you

[h100vw]

How have you diagnosed it's failure mate. Give us a bit more to work with. There has to be damaged cars all around the world for parts, if that's what's needed.
Hope tomorrow goes better for you.

Gavin

[Waah954]

Was driving and there was some noise started to come from the back end, first it sounded like a tyre rubbing on the guard then it went away didn't think much....

Soon after I take a right turn and hear a bit of a clicking/whining sound and then just all sort of sounds, got the car to my mechanic he checked a few things and goes your rear diff is gone.

So that's where I stand, so hopefully tomorrow will start my search to buy one. Thought to ask here maybe someone can point me where to find one.

[Passat R36]

go find a wrecker and buy parts

[Waah954]

Okay...

[Umai Naa!!]

This seems to be the second reported diff failure in a 3C Passat posted on here.

Odd, since the same diff is fitted to several other models, and could be considered bulletproof. It doesn't do a whole lot of work, since the cars it's fitted to are mostly front-drive biased.

Will be the same diff as a Tiguan, just swap the Haldex module over, providing it's not the Haldex module that has failed.

As an aside, the only thing that does actually kill VW diffs is when someone dumps the diff oil, and overfills the Haldex coupling because they haven't sought to work out which drain and fill plugs do what.

[Waah954]

Umai thanks for the reply can you explain more to me on how dumping the diff oil and 're filling can cause this.

So tiguan can fit the car and there is no diffrence in year models 08-10 r36 and wagon/sedan ?

[Umai Naa!!]

People have been known to drain the diff oil, and pump new diff oil into the Haldex coupling, thinking they're one and the same unit.

Diff blows, and Haldex misbehaves.

Apparently Passat diff assembly is uniquie to Passat. Ratios are different between different engines, too.

Best off finding someone who's wrecking an R36, and buy the diff out of that.

Part number is the same for '09, '10 and '11. You shouldn't have too much trouble finding one. The R36 was pretty popular, and people do find interesting ways to write them off.

[Waah954]

Was just reading some horror stories on the tiguan it seems a few people had problems with the rear diff....

Any chance we can get a picture of the diff and haldex coupling oil filling hole.

Oh also can you confirm is the haldex inside the diff, do I need to replace that cause from my understanding (which is limited) you can't replace the diff with the old haldex!

Wagon can fit a sedan ?

Thanks for all the help, looks like I will be on the phone all day tomorrow

[Umai Naa!!]

Plugs:




You can swap the module over easily enough, providing the coupling itself hasn't had an internal failure.

Wagon and sedan will be the same.