T400 Converter Feed Restrictor

[Hooter]

Now that I've got a handle on the Eagle crank thrust area surface finish, on to the tranny. Searching the archives, restricting the converter feed seems to be a good thing to help protect the thrust bearing. Question is - what size hole does this get restricted down to. From what I've read, is it 0.140 - 0.160?

[Hooter]

Now that I've got a handle on the Eagle crank thrust area surface finish, on to the tranny. Searching the archives, restricting the converter feed seems to be a good thing to help protect the thrust bearing. Question is - what size hole does this get restricted down to. From what I've read, is it 0.140 - 0.160?

[twooldgoats]

If I remember right, I went to a .125 (1/8") hole in the restrictor. Also, if you have a torque converter that has a bushing on the turbine hub to support the input shaft (most race converters do), then eliminate the input shaft bushing on your TH400, if you have one. It took both these modifications to solve my thrust bearing problems. The restrictor reduces flow into the converter and the removal of the input shaft bushing increases flow out of the converter. These changes may change the stall of the converter by a couple of hundred RPM, but there is no other change in performance and it WILL save your thrust bearing.

Jim

[Hooter]

Jim - What kind of restrictor did you use? From the photos in one of the archives, RPM posted photos of this plug and it looked like a holley jet.

[Hooter]

Jim - what kind of restrictor did you use? From the archives, RPM posted a couple of photos and the plug he used looked like a holley jet?

[twooldgoats]

I drilled and tapped the opening for a 1/4" thread set screw, drilled a hole in the set screw and put it in with Lock-tite. I got the set screw at Ace Hardware. I don't know if Holley jets would work or not. I'm thinking a lifter bore oil restrictor might be the right thread, too, if the passage in it was drilled out bigger. I used the same pics you're looking at, mainly to make sure I was modifying the right passage-way. I know virtually nothing about auto trans internals. http://pysales.com/images/sweat.gif http://pysales.com/images/sweat.gif http://forums.performanceyears.com/groupee_common/emoticons/icon_eek.gif