At 3/16" it almost sounds like it doesn't have a thrust bearing

 

You don't need no stinkin 408, do a forged 6.0 or 370 for cheaper and make the same HP on boost with out burning as much oil LOL

 

Thats what you'd think, but after wearing the bearing down so far, it starting digging into the crank. Wish i would of took pictures of the bearings and crank.

 

[IMG][/IMG]

 

hmmm i think i had a bad thrust bearing...


And yes the crank has a deep grove in it where the bearing was suppose to be.

 

IS that the rear thrust?

 

Yes the middle picture is the radiator side of the motor, and the bottom picture is the flywheel side.

 

So whats the story with this motor???

 

rebuilt lq4, flat top pistions, small cam, 243 heads, balanced/ blue printed ect. just the normal stuff, it ran good for 1500 miles then one time i floored it and it feel on its face. after that oil psi was a little unstable and it started getting a crazy amount of kr, and ran like ****.

Maybe i installed the tq converter wrong and it tried to push the crank out of the front of the block?

trucks been sitting for a long time this problem started back in 2009 i think. I just had to many other projects, now im starting over on this one but im doing it right this time with FI.

 

I was just wondering the same thing. IF there is an issue with the trans and converter not being seated properly it could effectively do the same thing.

Did you have a gap between the converter and the flex plate when you installed it???

When the converter is properly seated all the way back the trans should slide right on and you should have a 1/8-3/16 gap between the mounting lugs and the flex-plate. Any less and it could push the crank forward. Any more and it needs a shim to maintain the proper engagement between the converter and the pump gear.