Joining the rear diff club

[Displayhawk]

As an update, my original rear differential had to be replaced at approximately 50k under warranty about a year ago. The service advisor told me that the new rear differential was from a different vendor than the original. I am wanting to replace the "break in" gear oil in the new unit, but I am trying to decide between the AC Delco OEM gear oil or try the Triax 75w90 gear oil. The Triax shows that it greatly exceeds the OEM specs.

 

[fredzy]

As an update, my original rear differential had to be replaced at approximately 50k under warranty about a year ago. The service advisor told me that the new rear differential was from a different vendor than the original. I am wanting to replace the "break in" gear oil in the new unit, but I am trying to decide between the AC Delco OEM gear oil or try the Triax 75w90 gear oil. The Triax shows that it greatly exceeds the OEM specs.

That’s interesting. The rear diff is supposed to be a GKN twinster which can only come from GKN. If true it would be very interesting to hear what it is. Maybe it’s the assembly of the twinster into the whole diff sub-asm that can come from different vendors.

If it is still a twinster then you definitely do not want to put anything besides the OEM stuff in there. There is a long trail of dead diffs from people putting fluid other than the OEM stuff into them.