Thread: Auto Trans Issue?

Whose the ZF rebuild expert here in Australia? Is it still someone in Melbourne?

Originally Posted by rick130

No need to be sorry, just pointing out what most people don't realise that the actual specification has been officially superseded by Dexron VI, although I wouldn't use a Dex VI as it's a low viscosity fluid, but it has superior oxidation, wear and clutch lock up characteristics to a DEX III while meeting the frictional requirements for the clutches.

And FWIW I'd much rather use an ATF with a modern add package that meets the frictional requirements of Dex III
Lubricants have come a long way in the last 15 years.

Just curious as to why you wouldn't use a lower viscosity fluid?
is it that it's just too low in an overall sense, ie. over the entire temp range.

I would have thought that the more modern oils would be more viscous stable.
So in an overall sense even tho it's lower viscosity, it maintains it higher in the temp range than an older tech oil(or in this case trans fluid).

Dunno nuthing, so not questioning your comments, looking for 'more info'.

Dex VI is lower right across the temp range.
The two fluids discussed above are full syns and extremely temp stable.
They have very good/high viscosity indexes, at least equivalent to a Dex VI fluid.
Most Dex VI's are semi syns, too.


Most all multigrade oils will shear a little or a lot in use, full synthetics are generally much more shear stable as the base oils have a higher viscosity index and so need lower levels or sometimes no viscosity index improvers added to them. VI's are polymeric thickeners added to a base oil to give it multigrade properties and are the things that eventually shear in use.

I called A&B Automotive Transmission Service & Repair earlier. They advised only Dex 6. When I asked which oil he’d use if it was his car he said that in the shop they only use Castrol, which, unless I’m reading the Castrol website wrong, is pretty much only transmax z.

Hopefully the oil will fix the problem but he said that it sounded like wear on the clutches which will mean a $4400 rebuild. Fingers crossed but this is a 19 year old transmission.

So....
When I do my next service change and I opt for the Penrite full syn, currently using the semi and get an extra 2x smoother shifting🤣


Would this be compatible and only do two add/drain/fill or do the three full change??

Cheers Lemo

Originally Posted by John_D2

....

Hopefully the oil will fix the problem but he said that it sounded like wear on the clutches which will mean a $4400 rebuild. Fingers crossed but this is a 19 year old transmission.

IIRC, you only recently started towing a camper trailer?

If so, maybe the additional load has finally pushed it over the edge.

There are HP24 parts that replace the common problem bits in the 22e..
bolt straight in too,, aparently.....

I emailed Wholesale Auto Transmissions about gerabox rebuilds for a TD5,( must have been doing someone a favour)
and the outcome was they would rebuild the box till it could handle whatever power you made,,

From outcomes on this forum, these guys and A&B would be my choice for an improved rebuild,,

Originally Posted by AK83

IIRC, you only recently started towing a camper trailer?

If so, maybe the additional load has finally pushed it over the edge.

Agreed. Again it’s 19 years old and I don’t know the history of the previous owners.