Join Date: Apr 2011
Location: Edmonton, Alberta Canada
Re: C4 Best Trans Fluid for performance
For the record...
Ford type F is "slippery-er" than Dexron II/III. Different co-efficient of friction.
The additive package is also a bit different.
Type F was engineered to provide smooth shifts in a stock passenger car application.
One "trick" I heard years ago, was, to make your Ford trans shift "firmer" change the oil to (at the time) Dexron II.
Because of the different co-efficient of friction, the Dex would make the shifts feel "more firm".
Re; clutch clearance.
"Rule of thumb" clutch clearance is 0.010" per friction clutch.
So if your clutch pack has 5 frictions in it, then 0.050" would be a good starting point.
Some clutch packs require more clearance, depending on their function.
Of course, if you have the manufacturers clearance spec, that should be followed.
The forward clutch on a C4 or C6 can get away with tighter clearance, since that clutch just applies, and stays on, whenever the trans is in a forward gear.
It does not need to release at any time during forward travel, like a "shift clutch" pack might.
The clearance in the forward clutch is only needed for neutral/park, and reverse.
If you make a habit of revving the engine to 6000 RPM in neutral/park, or if you go really fast in reverse,
then a tight clearance in the forward might be an issue.
Also for the record...
I don't like the Alto "Red Racer" friction plates.
I will admit to a bias against any Alto product.
I just don't like them.
The Borg/Warner or Raybestos Hi Energy or racing frictions are excellent, as are the Exedy frictions.
Last edited by galaxiex; 01-25-2019 at 11:05 AM.