I have a S4 with a S4 JDM motor and driveline swap. and should I replace the gasket on the diff? I was told that I should change the fluid.

 

Dont replace the diff gasket unless its leaking. You should def. Change the trans and diff fluid. and brake and clutch fluid as they are the most over looked and do lots of damage if left alone.

Transfluid I use Redline (3qts 75w90 GL4 Synthetic)
Diff I use Redline (75W90 GL-5 Gear Oil Synthetic)

 

I think I use 80w90 heavy duty gear oil by Lucas Oil... For the differential and the transmission. I'll double check tomorrow.

 

this is an awesome timing I was planning on doing this exact same thing really soon on my auto and diff

 

NEO 75w90RHD

 

well 75w90 seems to be the most common. lol

 

Redline MT-90 in the transmission and heavy shockproof in the diff for me

 

where can I get said products

 

Any auto store should carry most brands of gear oil.

 

How many qts for the diff?

 

Autozone and advance do not have redline

 

You can get neo online try oreilly's if you have one near you for recline.

 

I've used Redline in my car, now I use NEO and it's become the new preference.

 

the problem is I only have a PO box

 

Yeah, it sucks that the best fluids can only be picked up online. as it seems

 

mazdatrix is asking $15 a qt

 

So what would be a descent brand from stores like autozone?