[T3] milage spec to change Diff oil with auto trans?

[William J]

Thank you Jim :

 I never had a owners manual . I do have a slight leak on the left axle seal 
, not dripping down but I see it on the left rear shock , not much . It's 
just a bit of light spatter marks not wet or dripping down the shock.. I 
noticed that in 2009 when adjusting the valves . I need to replace those 
seals since they are old .

 I intend to change it and look at the drain plug. If I had known I would 
have changed it long ago.

 I hope since I don't hear any final drive noise or gear or bearing noise it 
should be ok . That is to say it has not failed or changed since I got this 
car.

 I think autozone has those seals National brand.

William
----- Original Message ----- 
From: "Jim Adney" <jadney at VWType3.org>
To: <type3 at vwtype3.org>
Sent: Wednesday, February 24, 2016 2:58 PM
Subject: Re: [T3] milage spec to change Diff oil with auto trans?


> On 24 Feb 2016 at 13:49, William J wrote:
>
>> I always looked in the Bentley and it only states replacing the diff
>> fluid on two model years think 68 &9 . On later modles it only states
>> replacing it if it's contaminated .
>
> I had no idea that this was different for '68-9. It's possible that
> improvements in gear oil made this possible, but it's also possible
> that VW's experience with this system was new enough that they were
> being cautious. I should also note that there are a few significant
> differences between those 2 generations of ATs, but I'm not sure that
> any of them would make any difference in the maintenance schedule.
>
> I just looked at a 1970 owner's manual, the one from the glove
> compartment. It says the AT final drive oil should be checked every
> 6000 mi and topped up if it's low. My practice has always been to
> change that oil any time I buy a new Squareback. It just seems
> prudent after all this time and miles. It also gives you a chance to
> look at the magnetic drain plug and see what it's captured.
>
> Someone once mentioned to me that a lot of Type 3 AT gearboxes die
> because they sometimes run dry and no one notices. Checking every
> 6000 miles would avoid this. There's the tendency to check the ATF
> dipstick and assume you're done. It's unfortunate that the final
> drive oil, like the MT gearbox oil, is much harder to check. If they
> run dry, it's likely because one of the output shaft seals failed, so
> that's worth keeping an eye on.
>
> I have 3 Type 3 ATs, and they've all been fine so far. According to
> Russ, they were always quite reliable.
>
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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