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Old 01-21-2009, 10:44 AM
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700R4 B&M speed sensor

I am considering switching transmissions from a TH350C to a 700R4. Presently my TH350C lockup feature is activated with a B&M unit (70244) which senses the mph and will activate the Lockup at any specific dialed MPH. It works great. B&M literature says that the same unit can be used on a 700R4 but to "Deactivate the converter clutch shift valve by removing the spring holding the valve train in the OFF position". All of these instructions can be seen on their website. Was just wondering if anyone here has used this B&M lockup unit on their 700R4 and, if so, was there any problems incountered or additional modification to be done.

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Old 01-21-2009, 11:17 AM
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That mod shown is if your new trans achieves lockup from the valve body. If lockup is achieved through a solenoid, (as before with your TH350C) then your present switch will work.
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