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700R4 Lockup 
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Joined: Sun Jul 30, 2017 4:41 am
Posts: 1
I have a late model 700R4 installed behind a 350 Ramjet. My transmission has no 4th gear port on passenger side of unit. I read where I could put vacuum switch in the large round cover just in front of where 4th gear port is on early models. This would allow tranny to lockup in 4th gear. Any help appreciated.

Sun Jul 30, 2017 4:53 am
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Joined: Fri Jun 29, 2012 4:23 pm
Posts: 397
I have heard of using the servo cover for a 4th gear pressure. If you do this you cannot floor it when in 4th gear (overdrive). As this can destroy the clutch in the torque converter. If the transmission comes out of overdrive easily, then you would be ok here. Otherwise, bring the shift lever back to 3rd gear before giving it a lot of throttle. The best way is to use the vacuum switch setup that takes into account the throttle opening, thereby locking and unlocking the torque converter based on throttle.

Tue Aug 01, 2017 12:16 pm
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