Going to change out rear diff fluid and trans fluid

wondering what I should use. Going to be tracking the car heavily.

 

Hear good things about redline but I've only used royal purple. Next time I change my diff and tranny ima go wit redline. Remember u need a suction pump to get the fluid in there and u need to search cause this topic has been discussed before.

 

Switched to Redline on both the tranny and diff when I swapped in a VSLD a few months ago and will never go back to OEM. I now swear by Redline. Top notch stuff. Could not believe how much of a difference it would make. Plus I went from 1-2 month old OEM fluid to Redline so I basically went from new fluid to new fluid and the difference was huge.

 

Be aware that the Redline fluids needed for a trans and diff change are completely different. MT85 is what's used for the tranny, while a 75-90 wt oil for the diff uses pressure additives that can ruin a tranny.

 

Yes! I should have mentioned that. MT-85 in tranny and 75-90 for diff is what our car uses. I bought my fluid from Z1Motorsports.com