Yes its for the diff

GL5 is like a rating or classification for the oil. Not exactly sure what it means, but i know your in trouble if you use GL4 in your diff......

You could try this oil right here

Motul diff oil or the one above which is 75w140. Not sure if it will fix the problem but since its 10-20$ for a quart of oil its cheap troubleshooting.

 

Motul is fine, get the full synthetic version. I believe they have semi and full 75w90

I have it in there with no unusual noises

 

guess i have to try motul then..oh well goodbuy to royal purple then....... i need to protect my diffy.

 

what type of motul diff oil should i use?? there are two types the 75w90 and the 75w140??? thanks they are both gl5. the 75w140 is competion and the 75w90 is gear FFlsd type 2

 

75w140 over 75w90.

your royal purple is already 75w90

 

SO THIS MEANS I HAVE TO GO WITH THE 75W140??? thanks!!!

oh by the way im having my tranny oil change today from royalpurple to HONDA MTF. did i make the right decicio??? thanks!!!

 

[QUOTE=pinoyk20,Dec 28 2007, 12:35 AM] SO THIS MEANS I HAVE TO GO WITH THE 75W140???

 

hi guys!! we just finished inspecting the humming sound and its comming from thr tranny not from the diff. my mechanic said that its normanl since the tranny hasnt been used for 5years,, he said it could come off and it cane be louder... he said it could be the bearings.................what do you think guys??? thanks!!!

 

Bears could be pitted. There's a write up about it somewhere.

 

so can it be cured???? and what do you mean by bearings could be pitted?? thanks!! sorry noobi here.. thanks guys!! happy new year!!!