Switch Pitch converter

jaysun · February 16th, 2009, 10:58 AM

iI picked up a 65 th-400 this weekend for the some of hard parts to rebuild my th-375. turned out to be a switch pitch. I think i would like to use it. What should i do with the converter? I havent seen anywhere that sells new or rebuilt switch pitch converters. should i just take it to my local transmission shop and have them flush it? Does anyone rebuild these things? Cost of a rebuild?

I already took the trans apart down to the center support and it looks clean no metal fillings or junk in fluid. fwiw

joe_padavano · February 16th, 2009, 01:09 PM

Quote:

Originally Posted by jaysun

iI picked up a 65 th-400 this weekend for the some of hard parts to rebuild my th-375. turned out to be a switch pitch. I think i would like to use it. What should i do with the converter? I havent seen anywhere that sells new or rebuilt switch pitch converters. should i just take it to my local transmission shop and have them flush it? Does anyone rebuild these things? Cost of a rebuild?

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d2_willys · February 17th, 2009, 07:34 AM

If you decide not to use it, let me know, I am interested. Do you know where another one may be, complete? One of the members has one, but is missing the sp converter and electrical connector.

joe_padavano · February 18th, 2009, 05:33 PM

Quote:

Originally Posted by coldwar

...the smaller convertor from a Oldsmobile two-speed Jetaway will work, and provide somewhat higher flash stall speed in both vane positions -

It's not clear that higher stall speed is better. You want the lowest stall speed possible that lets you launch the car. Once the car is in motion, the higher stall speed simply results in wasted HP due to slippage. The whole point of the switch pitch is to provide the higher stall speed for acceleration while reverting to the lower stall speed for more efficient operation at speed. Modern torque converter clutches take this concept to it's ultimate development.

jaysun · February 19th, 2009, 11:53 AM

I woke up way to early yesterday and went through the rest of the trans except for the pump. looks clean and i probally could of used it as is, if it had a spedo hole. The smallest converter that pae sells (3000) seems a little high for my car. I'll give the stock converter a shot and see how it does. I'll see if a local shop has the right equipment and expertise to check and flush just the converter. I just don't want to fubar it, drilling holes or leaving solvent in.

d2_willys I'll keep my eyes and ears open for ya. do you need just the hard parts or the whole transmission? pae sells a conversion kit. kinda expensive tho.

thanks everyone

jaysun

February 16th, 2009, 10:58 AM	#1 (permalink)
jaysun ate glue as a child Join Date: Feb 2009 Location: madison wi Posts: 75	Switch Pitch converter iI picked up a 65 th-400 this weekend for the some of hard parts to rebuild my th-375. turned out to be a switch pitch. I think i would like to use it. What should i do with the converter? I havent seen anywhere that sells new or rebuilt switch pitch converters. should i just take it to my local transmission shop and have them flush it? Does anyone rebuild these things? Cost of a rebuild? I already took the trans apart down to the center support and it looks clean no metal fillings or junk in fluid. fwiw

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February 17th, 2009, 07:34 AM	#3 (permalink)
d2_willys Registered User Join Date: Sep 2008 Location: Kansas Posts: 88	If you decide not to use it, let me know, I am interested. Do you know where another one may be, complete? One of the members has one, but is missing the sp converter and electrical connector.

February 19th, 2009, 11:53 AM	#5 (permalink)
jaysun ate glue as a child Join Date: Feb 2009 Location: madison wi Posts: 75	I woke up way to early yesterday and went through the rest of the trans except for the pump. looks clean and i probally could of used it as is, if it had a spedo hole. The smallest converter that pae sells (3000) seems a little high for my car. I'll give the stock converter a shot and see how it does. I'll see if a local shop has the right equipment and expertise to check and flush just the converter. I just don't want to fubar it, drilling holes or leaving solvent in. d2_willys I'll keep my eyes and ears open for ya. do you need just the hard parts or the whole transmission? pae sells a conversion kit. kinda expensive tho. thanks everyone jaysun