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Old 08-06-2011, 03:51 PM
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Advise for 700-r-4

Please don't beat me up too much, I am new to this forum and this is my first post.

Hi to all...

I am in the process of purchasing a 51 Chevy 3100 that has been made into a resto mod. In my opinion, a very nice piece and well put together. My question is: The gentleman that had the truck built relied on experts in their respective fields to get the truck in the condition that it is today. The truck has a 700-r-4 transmission. At this point, I do not know what year it is. The transmission was professionally rebuilt prior to being installed into the truck. I was informed that there is a toggle switch on the dash that activates overdrive for the transmission. That seemed strange and the owner did not know anything other then it was there to use to conserve fuel. As I recall when I had 700-r-4 transmissions they shifted from first to second, lock-up occurred for the torque converter and it then went to third and fourth. I do not understand this switch for the overdrive! Could it be for the lock-up?

Can this be made to shift through all gears and lock-up without flipping a switch?

Your comments are appreciated. Richard

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Old 08-06-2011, 08:13 PM
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There are various sensors and stand-alone computers that can be used to send the lockup signal based on speed and vacuum, but it sounds like the PO just decided to use a simple switch. Its not very elegant, but I guess it works.

I think I would use something like this controller.

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Old 08-06-2011, 08:38 PM
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Well without any more information than that, just drive the truck and see what the switch does. My bet it will shift through all gears and lock the converter in 4th. Flip the switch and the TCC will disengage.

It's a very common way to wire the TCC.
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Old 08-06-2011, 09:08 PM
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Thanks For Your Advice

Two replies and two great responses. I pick the truck up on Wednesday and will make evaulations at that time. Will let you know then. Thanks
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Old 08-07-2011, 04:03 AM
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Depending on how many Pressure Switches are on the Valvebody it may Lockup the TCC in 2nd, 3rd & 4th.
There're many Lockup Kits that work with or without a Toggle switch. There're also Hydraulic Lockup Kits that do away with all the electronics for Lockup.
Personally I like having the Toggle switch to disable Lockup for intown driving as it can sometimes be annoying = Engine lugging, if the Lockup point/speed isn't tuned properly.
A few Lockup wiring diagrams>>
Hyd. Lockup>> Part #700-LU
700R4 ID>> The Chevy TH-700R4 Transmission.
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