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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Methods to control 700r4 converter lock up clutch ?
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Topic Review (Newest First)
08-30-2012 08:48 AM
52 mike well the column has od shifter so i'm assuming it was 700r4. when i drive it shifts 3 times so it starts out in 1st.
08-30-2012 03:00 AM
SSedan64
Quote:
Originally Posted by 52 mike View Post
my trans is rebuilt and i've only put a couple miles on it, i shifts fine thru all gears, but when i stop the engine dies. like i said there are no switches hooked up to tc lock up plug. also curious there are 7 detents in my overdrive steering column out of a chevy van, but i count only 6 positions on my tranny when i hooked up shift linkage. shifter on column won't go into 1st gear.

P-R-N-O/D-3-2-1

If you can't get Low/1st your shifter Linkage isn't adjusted correctly & may be trying to go into 2 gears at once.
What Trans did the Chevy Van have in it?
08-29-2012 09:56 PM
RatPin bowtieoverdrives sells a smart little complete kit and it's very easy to install. Just installed it on mine. Have not fired it yet, but the theory of the design seems solid.
08-29-2012 09:10 PM
52 mike my trans is rebuilt and i've only put a couple miles on it, i shifts fine thru all gears, but when i stop the engine dies. like i said there are no switches hooked up to tc lock up plug. also curious there are 7 detents in my overdrive steering column out of a chevy van, but i count only 6 positions on my tranny when i hooked up shift linkage. shifter on column won't go into 1st gear.
08-29-2012 06:27 AM
SSedan64
Quote:
Originally Posted by 52 mike View Post
when i put 700r4 in gear engine dies, nothing plugged into tc lockup connector. i ohmed out connector and got 0 on all three terminals, and putting 12v to it does nothing. it sounds like lockup may be on all the time?
The Trans is designed to only Lock the TCC/TorqueConverterClutch in 2nd, 3rd, & 4th gears. If it's Locking up in 1st/Low or Reverse, either the TCC is damaged or you have a Lockup TC installed in a Trans that has been converted to use a Non-Lockup TC.
08-29-2012 06:13 AM
dogwater If you have no voltage to the sol.valve then it shouldn't be locked up. Why it stalls in gear,I don't know.If you have normally open pressure swtichs or switch they will act like an open curcit. I don't know if you know that the pressure switches on 700r4 come with two kinds, n.o. & n.c.I compleatly rewired mine using n.o. 4th gear pressure sw. only & n.o. sol. valve,both are grounded to the case.Didn't use the heat sensor so its only one wire.
08-29-2012 01:28 AM
gmc pickup
Quote:
Originally Posted by 52 mike View Post
when i put 700r4 in gear engine dies, nothing plugged into tc lockup connector. i ohmed out connector and got 0 on all three terminals, and putting 12v to it does nothing. it sounds like lockup may be on all the time?
just been told that if converter is in lock the engine will stall as there is no slip when you at stop
08-29-2012 01:23 AM
gmc pickup
Quote:
Originally Posted by 52 mike View Post
when i put 700r4 in gear engine dies, nothing plugged into tc lockup connector. i ohmed out connector and got 0 on all three terminals, and putting 12v to it does nothing. it sounds like lockup may be on all the time?
mike i think my auto onlyh shifts 1 2 3 dont seem to go into 4
if the lock up is on all the time would the engine stall when up stop ?
08-28-2012 09:48 PM
52 mike when i put 700r4 in gear engine dies, nothing plugged into tc lockup connector. i ohmed out connector and got 0 on all three terminals, and putting 12v to it does nothing. it sounds like lockup may be on all the time?
08-28-2012 07:05 AM
dogwater I made my own using a relay,and a vaccum switch from a 86 Chevy truck and one wire going into the trans for 4th gear lockup only.I've got it all written down at home,if your interested.
08-27-2012 05:29 AM
astroracer Do an on-line search under "torque convertor lock-up". There are a dozen kits out there to do this. Summit and Jegs sell a number of them and there is enough info on-linr to build your own.
Mark
08-26-2012 11:12 AM
gmc pickup
Methods to control 700r4 converter lock up clutch ?

i would like to know how to wire up the sol/switch on the box to lock the converter can i use this in all gears or just overdrive

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