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Old May 1st, 2012, 14:09   #1
bdmartinek
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Default Transmission and Differential Fluid Change

Hi!

I just had the transmission fluid changed for an automatic transmission, 02 Jetta. I was planning to have the differential fluid changed as well, but the shop said that the differential wasn't separate from transmission. I thought that this was true of the manual transmissions but not of the automatic. Can anyone confirm this? If the differential fluid is separate from the transmission in an automatic, I want to make sure I have the fluid changed. It would need to be done.

Thanks for you help.

(If the differential fluid is separate, can someone please tell me how you locate and access it, and how much fluid it would take to change it over.)
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Old May 1st, 2012, 14:14   #2
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it is most certainly separate....uses sythetic gear oil....you can use a pelo to suck it out through the speedo drive gear hole and refill using the same hole....years ago I working on a NB that had a chewed up speedo worm gear....when I called the dealership to find out what oil to use in the final drive they were adamant that it shared the autobox side fluid,....and how many years has VW been making the 01M?after a heated back and forth with the dealer tech I just gave up went to advance and got some mobil1 gear oil and all was happy.... and the kicker was the dealership tech actually called me back after consulting the service manual (imagine that) to let me know that the 01M did have separate gear oil for the final drive...
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Old May 1st, 2012, 14:33   #3
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Definately takes gear lube on diff side.

I do believe it's the same lube as used in manual gear boxes.
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Old May 1st, 2012, 18:06   #4
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Thanks for confirming that. (It's crazy that a dealer wouldn't know that the automatic takes separate fluid, but that's what this forum is for, right!)

I suppose I'll just take care of the fluid change myself, but I don't know where the "speedo drive gear hole" is located. Could someone give me a rough idea? Is there a cable that I would follow to get to it, or is it located near the transmission, front/ rear? Also, do I need a special tool to remove it or is it tricky to get to? And how much gear oil does it take? I don't have a Pelo, so would any generic pump from a auto parts store work?

Thanks in advance for your help!!
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Old May 1st, 2012, 18:14   #5
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Pella or similar to suck it out.
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Old May 2nd, 2012, 09:06   #6
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I found a good thread that explains how to change the differential oil on an automatic. For any one interested, here's the link:
http://forums.tdiclub.com/showthread.php?t=142277
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Old May 2nd, 2012, 09:12   #7
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G052145S2 x1 (dry capacity 0.75 L) in case you are interested. It's supposedly (according to VW) a 75W90 synthetic.
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Old May 2nd, 2012, 16:49   #8
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An decent synthetic GL-5 gear lube should work, all it does is lube the diff gears.
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Old May 2nd, 2012, 16:56   #9
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I should point out that I'm painfully aware of 3 01m failures due to the diff. Two in my car (the original that went 60k and the VW reman they installed under warranty that went 155k) and a dead Jetta I bought from another member.

I dream of something as simple as a valve body rebuild.

When the diff grenades usually the car wont move (even if dragged) one direction - in my cases reverse. The axles had to be removed every time.

Change the diff fluid!
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Old May 2nd, 2012, 18:49   #10
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Had my diff checked for the 1st time 170k+ miles. It was down about 1/2 so had it sucked out and refilled with synth 75-90.
Whew, so much for lifetime fluid!
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Old May 2nd, 2012, 19:47   #11
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Thanks jcrews for the part # on the differential oil. That's some pricey oil. Is there really that much of a difference between what Volkswagen recommends and what you can get at an auto parts store?

Also, I need to get an oil extractor to do the job. I know that the Pela 6000 comes highly recommended but I wanted see if there are any other suggestions. Would Napa carry a comparable product at a better price?
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Old May 2nd, 2012, 19:50   #12
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I would use a high quality synthetic gear oil at 75W90. There aren't any brass synchros to deal with so GL5 is OK.

I bought a Moeller brand 5L unit at a west marine store many years ago, and it works very well. It think I paid about $60 for it.
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Old May 2nd, 2012, 20:41   #13
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This is random for this thread, but, out of curiosity, how do the engine oils provided by IDparts.com rank in comparison to Mobil 1 TDT? Are they equivalent, is one better than the other, or is one preferred? What's the best oil on the market for a TDI? I haven't used idparts before, but it looks like a credible website. Has anyone had problems with them or would they recommend anyone else?
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Old May 3rd, 2012, 05:18   #14
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Also, most of those diff covers leak/seep oil especially now with their age. Keep an eye out for any leaking on the cover gasket. It is a paper type gasket, and not available separate to my knowlege. Available only as part of a tranny rebuild kit from what I remember from my research. Also, I noticed a slight bump in FE when I changed mine to Mobil One 75w90 full synthetic. Good luck.
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Old May 3rd, 2012, 08:37   #15
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Quote:
Originally Posted by bdmartinek View Post
...out of curiosity, how do the engine oils provided by ...
OK, just STOP RIGHT THERE!

Switch to the fuel and lubes forum and read to your heart's content.
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