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Tom Goldman · 10-26-2011, 08:27 AM

Robbie, the converter needs a minimum of 3/16" clearance between the drive and the pump gear.
You can get by with 1/8" ,but 3/16" buys a little insurance.
Converter pressure will try to push the converter forward from the pump, slightly, but this is normal, and not to be confused with converter "balooning".
You really need to make sure the converter is not bottomed in the crankshaft hub as well, that can lead to crank thrust bearing and pump bearing issues.
Some of the thick plate type flexplates can cause converter clearance issues when used without a midplate.
Line pressures in a race or performance 400 are usually not nearly as high as a high HP Powerglide, usually 175# or less.

10-26-2011, 08:27 AM	#2
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,477 Likes: 893 Liked 883 Times in 237 Posts	Re: Turbo 400 trouble Robbie, the converter needs a minimum of 3/16" clearance between the drive and the pump gear. You can get by with 1/8" ,but 3/16" buys a little insurance. Converter pressure will try to push the converter forward from the pump, slightly, but this is normal, and not to be confused with converter "balooning". You really need to make sure the converter is not bottomed in the crankshaft hub as well, that can lead to crank thrust bearing and pump bearing issues. Some of the thick plate type flexplates can cause converter clearance issues when used without a midplate. Line pressures in a race or performance 400 are usually not nearly as high as a high HP Powerglide, usually 175# or less. __________________ Tom Goldman 1500 SG , 1506 STK Last edited by Tom Goldman; 10-26-2011 at 08:29 AM.