trans fluid change....., wanna make sure i buy the right stuff. Options

[scottb]

well off to the local parts store to buy the stuff for a trans fluid change. anything i should stay away from? anything in particular i should look for? or can i just grab 2.5 liters of any SAE 90 EP hyphoid gear oil on the shelf?

muchas gracias....... (IMG:style_emoticons/default/boldblue.gif)

[Brad Roberts]

So.. in all those debates did anybody go into what the factory recommended ?

Here is what I have found:

The synthetics allow the box to eat itself up about twice as fast as the old SWEPCO crap. We "ran" Redline in one race tranny and SWEPCO in all the others.. for a couple of seasons (both get rebuilt at the end of each season) The boxes get changed for every track so they should see just about equal wear. The Redline box shifted great.... for about 8 races. The SWEPCO box shifted great....well it still does. The Redline box died much quicker... is my point.

I cant confirm this (but I have been trying for years) Porsche designed the entire synchro mesh system around the old style gear lube. The gear lube was actually factored into the equation for helping to slow down the assembly when you pushed in the clutch. The makes a LOT of sense to me after seeing how fast the Redline box wore out. The bearings where great, but the synchros looked like they had a 100k miles on them.

Redline works great in your tranny (no doubt about it) but..I promise it wears the box out much much faster than running the SWEPCO stuff. The Redline also wore our ZF limited slips out much faster (even after working with the Redline people making sure we put the correct stuff in the box)

So.. debate away. SWEPCO in all my boxes (they are from Ft. Worth Texas)

B