700hr 4 speed lock up diagram /parts wiring???
12-19-2010, 11:59 PM
#1
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700hr 4 speed lock up diagram /parts wiring???
does any one know how to wire the '89- 700-r4 so that it can lock up in four gear? the ECM no longer controls the lock up!
aparently there are kits available.. external and internal modified can be made-- i have the pan off and could rewire internal with the correct info
need some info /explaination of the wiring and the parts used, please include infromation whether the internal orginal 4th gear pressure switch is used?
thanks
aparently there are kits available.. external and internal modified can be made-- i have the pan off and could rewire internal with the correct info
need some info /explaination of the wiring and the parts used, please include infromation whether the internal orginal 4th gear pressure switch is used?
thanks
Last edited by korvette4u; 12-20-2010 at 12:31 AM. Reason: 700R4
12-20-2010, 06:47 PM
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[/IMG] [IMG]
[/IMG]the image is type 21 tranny..thermal switch is not included in my tranny! but 4th CL (NO) is..
summary:
IF the A is sourced through the brake wire.. to vertify this ..a wire diagram of brake switch would help considerable! if it is purple. where's the location and proof?
term "D" then is grounded to case instead of ECM ground...correct?
term "B" is not used CORRECT?
does the above confrigration .
1) provide lock up in fourth gear?
2) provide unlock when downshifted to lower gear automatically?
3) unlock when brake applied?
When a switch is installed between term "D" and chassis ground. does it unlock when in open positon?
Last edited by korvette4u; 12-20-2010 at 06:50 PM.
12-20-2010, 07:04 PM
#4
the switch on the brake pedal has two sets of terminals; one for the stop light and one for the TCC release
2.No
3.Yes
Closing the switch completes the circuit to ground and the TCC solenoid operates , same as if ECM was controlling it
Last edited by vetteoz; 12-20-2010 at 07:08 PM.
12-20-2010, 11:30 PM
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In observation:
IF "A" power sourced from brake control "purple wire" is connected to T.C.C. SOL (in OIL PATH), then to terminal "D" (e.c.m. grd) is connected to "B" (e.c.m.) to utilize either ( this may be un neccesary) , temp switch and/ or 4th CL (NO), and switch (dash)to ground.
this will the lock TC (if all switches are closed) and will unlock if any one switch is open including (dash over ride manual controll switch).
it would then be safe say that the 4th switch is only used to alert the ECM of it being in four gear. the ECM is on holidays and wont be back!.to further say, terminal "D" can be directed to ground through a spst switch ( just for manual over ride) and the 700 R4 will lock only in 4th gear and release (unlock) when downshift occurs and or brake is applied.
in conclusion:
Wire terminal "A" to brake (C455- purple wire), terminal "D" (tan /blk)through switch then to ground, terminal "B" (blue)is unused.. transmission will function with TC lock up in four gear and unlock when not in 4th or with brake depressed (open).. will this method be safe and correct to use without harm to tranny?
Last edited by korvette4u; 12-20-2010 at 11:33 PM.
12-21-2010, 11:23 AM
#6
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Correct
But what you could do is split D to both B and a switch
Gives Auto lockup in 4th ( so you don't have to think about it ) and manual lockup in other gears when you want with brake over ride.
Only thing it would not give you is manual TCC control in 4th
Most likely that would not be a concern; 4th is cruising gear and if accelerating ,trans would drop back to 3rd and TCC would automatically disengage ( if man switch off)
Pete K (a construction worker with a hobby , no thanks)will confirm but only relevance I know of between TCC and trans is that in the early T700 ( pre '88?)
you must have lockup because you only get full fluid flow to the trans cooler when TCC is engaged.
Running a later T700 with no lockup is no different than running old style trans like TH400 that had no lockup.
Only thing that suffers is fuel economy.
But what you could do is split D to both B and a switch
Gives Auto lockup in 4th ( so you don't have to think about it ) and manual lockup in other gears when you want with brake over ride.
Only thing it would not give you is manual TCC control in 4th
Most likely that would not be a concern; 4th is cruising gear and if accelerating ,trans would drop back to 3rd and TCC would automatically disengage ( if man switch off)
Pete K (a construction worker with a hobby , no thanks)will confirm but only relevance I know of between TCC and trans is that in the early T700 ( pre '88?)
you must have lockup because you only get full fluid flow to the trans cooler when TCC is engaged.
Running a later T700 with no lockup is no different than running old style trans like TH400 that had no lockup.
Only thing that suffers is fuel economy.
700 -R4-1989 engine code "Y"..
thank you for all the infromation you presented, very worthy!!
12-21-2010, 04:19 PM
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[QUOTE=Originally Posted by rodj
Correct
.[/QUOTE]
Ok just got back from GORD,,, the formula is "KEEP IT SIMPLE".. or "K.I.S.S."
it is vertified that a "A" powered by purple from brake and "D" to ground is ALL that needed..!!!!
SIMPLIY the ECM is taken out of "complaining" circuit, of what to do!! the tranny valve body does everything else..!!
That concludes and fulfills my orginal questions.
I thank each and everyone whom has contributed to this thread and hope others may learn from it!
MERRY CHRISTMAS TO OURS FRIENDS IN THE USA and ALSO a SPEcial thanks to the austrialian "RODJ".. best wishes to all in the new year!!
korvette4u
Correct
.[/QUOTE]
Ok just got back from GORD,,, the formula is "KEEP IT SIMPLE".. or "K.I.S.S."
it is vertified that a "A" powered by purple from brake and "D" to ground is ALL that needed..!!!!
SIMPLIY the ECM is taken out of "complaining" circuit, of what to do!! the tranny valve body does everything else..!!
That concludes and fulfills my orginal questions.
I thank each and everyone whom has contributed to this thread and hope others may learn from it!
MERRY CHRISTMAS TO OURS FRIENDS IN THE USA and ALSO a SPEcial thanks to the austrialian "RODJ".. best wishes to all in the new year!!
korvette4u
Last edited by korvette4u; 12-22-2010 at 02:01 AM.
