th400 varible/switch pitch
#1
th400 varible/switch pitch
I have a variable/switch pitch th400 that came in a 70 442 I bought last fall. I have freshened up the engine and have done some performance improvements, now the convertor has seemed to take a dump on me, it has PAE 3000 04 06 stamped on it. my question is what need to be done to convert this to a standard non variable pitch transmission. the current engine combination is probably in the 475-500 hp range.
#5
well I drove the car again today. the convertor was working as it is supposed to for 1 pass, then it no longer would go into hi stall mode, solenoid clicks but does not loosen up. so then I made a pass in lo stall mode, trans has a lazy 1-2 shift then a ok but not great 2-3. I have the convertor off a two position switch on the shifter one position for convertor one for line lock, launch car, rpm reaches 4500-5000 lock convertor then 1-2 shift, this is what I understand is the preferred method of drag racing with a switch pitch according to the buick guys. there isn't much info out there of people drag racing with one of these units. seems like what I have read 500 hp and a switch pitch is not very reliable, this is a street car but it will be abused.
if someone is interested I would swap for a good bop th400 if it had good parts in it.
if someone is interested I would swap for a good bop th400 if it had good parts in it.
#8
Which plug? The 1/4" one with the orifice hole?
If that's your question, just enlarge the hole sufficiently to screw a sheet metal screw into the plug. Use a slide hammer to pull it out. Use grease on the drill bit and the screw to contain metal filings.
If that's your question, just enlarge the hole sufficiently to screw a sheet metal screw into the plug. Use a slide hammer to pull it out. Use grease on the drill bit and the screw to contain metal filings.
#10
#11
The switch pitch parts came out of a 1967 442. The torque converter id still attached to the engine. I'll take it off this weekend and forward photos. If you have any questions email me at pro67442@aol.com
#14
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