Red Line Gear Oil
 

I going to drain the red line I have in my trans and rear end. I'm going from the heavy shockproof to lightweight. As you know it works great because it sticks to the gears. My question is some of the old will be left over is that ok or ????

Re: Red Line Gear Oil
 

Ed, are you switchng to light shock oil in both the trans and rearend? On both my stick cars, I use the light shock (blue) Redline oil in the Jericos, but stuck with the heavy shock (pink) oil in the rearends. I have broke a couple of gear sets in the Stocker Mustang, even with the heavy shock, although the Pro gears in the Dana in my bracket car still looked mint after 6 seasons, so I am a bit afraid to switch to the lighter oil in the diffs.
As for any issues from the 2 oils mixing, I can`t say, but it is a hell of a job trying to get all the old oil out of the housing and tubes. That Redline oil sticks like wet paint! Even after sitting for months, when I pulled the diff cover, the oil was still covering every inch of the housing and tubes, as if it just finished a long run. A toilet brush clamped to a broom handle makes a handy tool for cleaning out the axle tubes. Personally, I would prefer to get all the old oil out, just because. I would be curious to see if the lighter oil is worth any ET or MPH, and if so, how much.