I've got a manual transmission for a 420a (NVT350) with a Quaife limited slip differential. What should I use in it? I know with a stock transmission you're supposed to use ATF+4, but with this lsd I'm not sure what to use.
Thanks.

The quaife itself shouldn't change the oil type needed, it's the clutch style lsd's that need specific additives and/or gear oil for the friction discs, quaife's don't have friction discs.

Atf+4 should be the equivalent to dealer stuff for the nvt350, but you could use a light MT fluid like syncromesh if you choose.

Thanks guys, I'm just worried the ATF+4 will be too thin for the meshing gears in the Quaife diff. But if it seems to work I'll just go with it!

Brad Bell said:

I've got a manual transmission for a 420a (NVT350)........ I know with a stock transmission you're supposed to use ATF+4.......

Click to expand...

Don't run ATF+4

Use this (part# 04874465)
or Amsoil Synchromesh full synthetic 5w-30 MTF


https://forums.neons.org/viewtopic.php?t=323499

You can also run Mobile 1 5w-30 High mileage oil. This info came from Ed Peters himself. I use to run Amsoil, but Mobile 1 is just easier to get.