Doesn't it go from converter to cooler? ie; cooler's plugged? I always wondered what the symptons of a pinched line would be.

Jim we had a similar problem and after following a lot of the aforementioned causes we found the converter snout and crank register was not fitting correctly.It was only after we trued up these two mating surfaces did we eliminiated the problem.For what it's worth it was a 605" hemi with Callies crank and ATI converter.There was a flat ridge on the converter snout and the witness marks on that area and in the crank showed it was tight on a small area.After truing up the snout on the lathe cleaning up the crank register we never had the issue again.

Dealing with this issue in my cousin's 67 Firebird with a stroker 400. It now has wiped the thrust bearing twice. First time blamed the pressure in the tranny as the tranny had been rebuilt. This was a new build with the new stroker crank - old stock crank was fine.

In 125 street miles lost 0.010 inches in the thrust with the rebuilt motor. We are trying to cover all bases this time.

We want to know for sure if the tranny is causing excessive thrust on the crank so I believe we will measure the thrust force on the crank before we tear it apart. We have a plan...........

mark i know for a fact that a turbo 400 will wipe out the thrust bearing in the engine it is behind, if the convertor charger hole in the pump is not taken car of go to yellow bullet hutch trans section !!!!!

thanks for the input BOB i will check that before i reinstall it i sent it back to ati it hasn't been freshened since 2008 [i found paper work on it] cant hut to have it checked ?? its just weird that it happend so fast ?? one pass NO NO2 !! i noticed it lost about 20 psi of oil pressure so i put it on the trailer, took it apart 2 days later and i found metal in the oil pan only thing wrong was the back of the thrust bearing was destroyed all the other bearings were near perfect

Same crank, same trans, same converter that you have ALWAYS run, with no issues. So look at it logically. Did the converter to crank hub fitment suddenly change? Highly unlikely.......So what else was changed? You freshened motor and trans. So looking at it from that standpoint, you either set the thrust up WAY tight or something in the trans is not letting the converter exhaust the fluid fast enough............Or, like I said, the element in converter COULD be going away, but I am still betting something in trans. Ten year old converter though, so it sure wouldn't hurt to have it looked at and freshened

Monte

yeah , monte im going to take the trans a apart , check my trans cooler and lines and i sent the convertor back to ati , i checked my my records the thrust was .006 , ill post back what i find !!!!

Thanks! I did not know Yellow Bullet had a tranny forum. Did find some interesting info.