Hatch grb spec c trans and diff oil change

Hedgecutter

Type RA Member
This may help a fellow hatch spec C owner avoid the mistake that I made, although they will probably be a bit more switched on than me. Just done my 2nd gearbox and diff oil change at 53000 miles, having done the 1st one at 25000 miles. The hatch spec C has a mechanical rear diff, and although I have a jap manual, it wasn't clear what oil to use , so 75-90 LS oil was used front and rear, and it was quite noisy.
This time, with the aid of google translate, it was clear the diff oil should be Subaru LSD oil, which was originally a 90 ls oil. So I used one litre of Titan race gear LS 90 in the rear diff, and 4.1 litres Millers crx 75w90nt+ in the front.
If you have the STI flexible lower chassis brace at the front, it will obstruct the front diff sump plug, so one side of the bar needs to be taken off.
There was hardly any metal on the sump magnets, so little harm seems to have occurred over 28000 miles, and the drive train all sounds much quieter.
 

asperformance

Site Supporter
You should never use LS spec oil in a Synchro transmission......

We could easily have sorted both the supply and the correct information for you as we have done for 20yrs or so.....:thumb
 

Hedgecutter

Type RA Member
I'll correct myself there; Millers crx 75w90nt+ was used in the front originally, and Millers 75w90LS motorsport in the rear diff.
It's now much smoother on the overrun, and much quieter. It was due, as well.
 

Toff

Type RA Member
@Hedgecutter I have recently done mine and used LS Motul gear 300 and normal gear 300 in the front.
Did you fill from the drivers side plug at the top? Noticed mine never had a dipstick in the box/front diff so used the filler on the passenger side from underneath. It spills out when the full amount is in. The top bung seemed more of a faff to use imo!
 

Toff

Type RA Member
Does yours have a dipstick? All other 6 speeds apart from mine seemed too lol! But yeah a tiny bit under the recommended "Fill" level and it was running out so I'm happy.
And sadly not, DVSA are ever so picky so it looks to be me waiting till next year. No massive issue though, keeps it off the salty mucky wet roads and all that.
Plus side, it's as mint as a mint thing can be now, every nut and bolt on the underside has been out, cleaned and greased, side skirts off and paintwork polished underneath and waxed, sills and cavities all oil and wax filled, every fluid changed, engine bay detailed, interior immaculate (all seats out etc)
Before it's on the road I aim to have a downpipe and fuel pump fitted with a remap at Enginetuner.
Going to try a few old massage tricks to bring it as close to 400hp as possibly on the VF56 Turbo.
 

Hedgecutter

Type RA Member
There was only a dipstick up to the Hawk I think. Sti hatches definitely don't have them.
You'll have got your car so immaculate that you'll be afraid to ever take it out! Best to sell it to someone like me who'll trash it around daily in all sorts of weather!
And anyway, none of it's true without photos or it's own thread ??
 

Top