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Transaxle / differential oil for t25 auto
Posted: 14 Jul 2018, 21:48
by flatnbroke
Hi guys , we have a 1987 t25 automatic gearbox . It has a leak off the sump gasket so am going to replace it .what oil do I use as just as well change it while I'm there.many thanks.
Re: Transaxle / differential oil for t25 auto
Posted: 14 Jul 2018, 22:14
by Sir Brixalot
ATF fluid. I'll check tomorrow for exact spec. There's also a final drive that owners often don't know about that takes gear oil - accessed with a large allen key.
Re: Transaxle / differential oil for t25 auto
Posted: 14 Jul 2018, 22:21
by flatnbroke
Ah , cheers . I have a Haynes manual and a Bentley one but still not sure . I know the gearbox takes dexron 6 as just had a rebuild.
I just don't want to muck it all up making a rookie mistake!! I have seen a section on final drive oil but not sure what it is tbh , I have the seal on the way from vw heritage for the sump and know I refill on the side of the diff up to the hole level but that's it.
Re: Transaxle / differential oil for t25 auto
Posted: 14 Jul 2018, 23:10
by Sir Brixalot
Sounds like you've got a good idea of what you need. AFAIK ATF should be hot when putting final top up in and some say the engine should also be running. Had two gear box rebuilds myself in a year - ouch
Re: Transaxle / differential oil for t25 auto
Posted: 15 Jul 2018, 12:14
by flatnbroke
My Bentley manual says at the start of the differential automatic transmission section (page 39.49 section 39) it says it takes it has a lubricant capacity of 1.3 litres
A viscosity of sae 90
Type hypoid ,MIL-L 2105B , API/GL-5
Is this correct???
Re: Transaxle / differential oil for t25 auto
Posted: 15 Jul 2018, 13:47
by petethefeet
Sounds like a bit of confusion. Red ATF fluid filled via the dip stick at the front of the engine bay for the auto box or your SAE90 gear oil for the diff/trans axle filled via the plug on the side of the diff housing.
If the sump gasket was a 2mm thick fibre type stuck to the gear box with some sealant that was the diff gasket (near back of van), if the gasket was a profiled rubber one that was the auto box (closer to the front of the van).
Hope that helps
Re: Transaxle / differential oil for t25 auto
Posted: 15 Jul 2018, 21:23
by flatnbroke
Cheers petethefeet, the gasket is a 2mm fibre one not the profiled rubber one for the gearbox sump.
Glad you cleared this confusion up will crack on changing the gasket and filling it with sae 90.thanks all!!
Re: Transaxle / differential oil for t25 auto
Posted: 16 Jul 2018, 07:07
by Cecil
Make sure you can undo the filler bung before draining the oil ! Though I don’t think it is as likely to be seized like the manual transmission one is prone to.