DaveG
09-21-2007, 04:21 PM
I have been hearing of some Thrust bearing failures again, I had 3 before I found help on Classical Pontiac. I now have 15K on my stroker, this is how I got mine to work with a Turbo 400.
1. Polish the crankshaft thrust surfaces as finely as possible this is not easy due the hardness, when these are ground at the factory the side of the wheel used is too coarse. (this should be done by a qualified machinist)
2. Reduce the charge oil flow to the Torque Converter inlet passage in the transmission pump from .25 to .1562 (see photo attachments) This is done by in installing a set screw and drilling through it
3. Add a free flowing transmission cooler, many after market coolers have too much restriction (I abandoned the cooler in the radiator) and I used 3/8" tubing and made sure the flare fittings in transmission are 5/16" I.D. (make sure there are no kinks in the lines)
Before the modification my 2500 stall converter was flashing at 2200 it now flashes at 2600.
I have referance material if you need it
1. Polish the crankshaft thrust surfaces as finely as possible this is not easy due the hardness, when these are ground at the factory the side of the wheel used is too coarse. (this should be done by a qualified machinist)
2. Reduce the charge oil flow to the Torque Converter inlet passage in the transmission pump from .25 to .1562 (see photo attachments) This is done by in installing a set screw and drilling through it
3. Add a free flowing transmission cooler, many after market coolers have too much restriction (I abandoned the cooler in the radiator) and I used 3/8" tubing and made sure the flare fittings in transmission are 5/16" I.D. (make sure there are no kinks in the lines)
Before the modification my 2500 stall converter was flashing at 2200 it now flashes at 2600.
I have referance material if you need it