I have brand new bottle of miller motorsport crx 75w90 fully synthetic gear oil would that be ok to use either the gearbox or diff of my 2wd cossie?

 

In the diff yes not the gearbox as it uses ATF dextron2

 

i was told to run 75w 90 in my T5? And i run ep80 90 in my diff, as it's all i could find in the garage!

 

i ran 75/90 fully synth in my t5 and std diff and never had a problem.. quitened the box right down as used to get noisy with the red water it had in before.. was recomended by bara..

 

your T5 is a world class T5. The WC T5 should not be running gear oil. It is to thick and will in time damage the syncros. ATF is the correct fluid for a WC T5 and gear oil for a NON WC T5. You will find if you swap out the gear oil for ATF the trans will shift much smoother.

 

mine was a little notchy from cold but once warmed up a little was perfect..
i had a new box fitted years ago by a1 rallysport and they used gear oil and not atf.. bara rebuilds them and recomended it to me and never had a problem with syncros... just stripping 3rd gear but doubt that was the oild fault..
this was on the normal cosworth t5 box

 

Normal cossie box is a WC i believe, i was recommended 75w-90 as i said, but my box was scrap anyway, it turned out.

 

this hasnt helped any haha

 

Basically, you can't go wrong with ATF, really. If your desperate. I've heard of loads of people going for 75w 90 though.

 

im not desperate i just found a unopened gallon of 75w90 and i wondered if i could use that in the diff or box so il use it in the diff instead of trying to sell it

 

i used to run mobil 75/90 in my box, then it started sticking in 4th,
it had broken and bent some sort of guide things, cant remember now what they were called,
the man that sorted it said it was most likely down to the oil i was running and to run the genuine ford mtx 75/90 oil as its different from other 75/90 oils,
i did as he said , so far so good , feels alot better than before too