I have a first gen road racer and just had a 4.44 ring and pinion installed in the third member. I need to bolt it back in and replace the shafts, and put new fluid in it. What do you guys recommend? It is a dedicated road race car so no street use. It is a limited slip diff also.

Thanks!

 

I used Red Line in my race car. I don't remember the weight. Maybe 75/90 or something like that. It worked very well, and was recommended for LSD's.

 

i run redline 75w-90 in my it-7 car, havent had a problem with it yet.

 

neo synthetic

get it at mazdatrix, it's what downing uses in his 4 rotor

 

My mechanic said not to use synthetic for a short break in period. He said no synthetic for only a 15 minute break in...them drain and use synthetic. What do you think? If this is true...what kind of oil is he talking about? The only experience I have is with synthetic...

Thanks!

 

Me too. Redline....

 

Used Redline in my stock 3rd gen diff from 47K miles to 112K, then it locked up (probably due to high horsepower single turbo, not an oil problem). Just installed a Kaaz lsd and use their synthetic oil, and use Amsoil in the tranny. Surprising thing is they recommend the Kaaz oil be changed every 6K miles.....not sure why the longevity is so short, or if they just want to try to sell more of their oil, or if they just assume that you do some brutal use of your car if you decided to go so far as to install a Kaaz.....

Beast

 

Castrol SAF-XA for my Mazda Factory Racing LSD, in my first gen. Works great!

 

Royal Purple. Great products (I use their gear lube, engine oil, pre-mix, bearing grease, etc.) and the national product rep/engineer, David Canitz, is a hardcore rotor-head who races an RX-3.

 

Thats probably not because the brand. Many race preped FDs running stock diff with the redline synthetic, and has good results. You probably have other problems.

kaaz oil is not full synthetic according to them. It has also friction modifier in their fluid, and its made for their LSDs. Not stock torsens. According to Kaaz, you CANNOT run synthetic oil with Kaaz LSD, so their fluid are not full synthetic. They recommend changing so frequent, again, its because the way their LSD works, and it will not apply on stock torsen.

 

If you road race or driver-ed a Torsen, use synth oil and change annually or more often. Just 3 events (600 miles) turned my normally fresh redline oil black from heat. Contrary to popular belief, torsens depend on friction to work, as do friction plate type lsd's like Auburn, Volvo, and Kaaz iirc.

 

Thanks for the info, OSDesign! Makes sense. I'm changing my motor oil every 2K, so what's another oil change every third time I do the motor oil?

 

Redline 75/90 Stock TII diff.

 

Redline