04-05-2012, 12:26 AM | #1 |
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700R4 With No Lockup?
I just purchased a '71 chevy c10 that the PO installed a 700R4 trans in. It has the TV cable connected with a home-made looking cable bracket, and the converter lockup wiring is not hooked up. Is it safe to drive the truck in overdrive with no converter lockup? Either way I'm going to be wiring up the converter lockup in the future, but I'm just curious about this.
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04-05-2012, 12:44 AM | #2 |
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Re: 700R4 With No Lockup?
When I bought the first one, the trans. shop said it was OK to run it without the lockup. I had it in a 63 with a 454 engine & ran it about a year that way before I put a lockout kit on it. I had no problem but the lockup gives it another demention. The main thing is to get the cable correct.
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04-05-2012, 12:53 AM | #3 |
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Re: 700R4 With No Lockup?
here is a link to a very helpful step by step on making sure the TV is adjusted properly.
http://www.maddogtransmissions.com/v.../tv_cables.pdf
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04-05-2012, 02:02 AM | #4 |
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Re: 700R4 With No Lockup?
It won't hurt anything by not using the lock-up.........except maybe your wallet at the gas pump. And a little extra heat generated by the converter while cruising on the highway. Back in the day, that's exactly how non-lockup 3-speeds worked all day long.
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04-05-2012, 08:36 PM | #5 |
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Re: 700R4 With No Lockup?
The converter "needs" to be locked up when in 4th gear. The planetary lube curcuit is cut to almost nothing when in 4th without the converter locked. Dont drive on long freeway trips in 4th.
When running a "non-lock up converter" in a 700R4.....You have to install a "Lube Valve" in the pump to correct the lube curcuit. This REQUIRES a non-lock up converter, The stock converter will not work. The lock up is easy to hook-up with a dual brake switch, wire, pan gasket & some ATF, Search this forum, Ive posted on this subject alot. Untill you do something run it in 3rd, Driving on long freeway trips in 4th WILL burn your planetaries down. I couldnt count the "Blue" gear sets ive seen from being overheated |
04-06-2012, 10:00 AM | #6 |
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Re: 700R4 With No Lockup?
Great info. I stand corrected. I never knew about the planetary lube circuit on lockup. Still learning something new everyday.
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04-06-2012, 04:15 PM | #7 |
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Re: 700R4 With No Lockup?
I stand corrected also. I use a vacuum switch from a late 80's van. I have it hooked to ported vacuum on the carb. It releases the lockup on hard accel. & decel. Will this harm the 4th gear?
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04-06-2012, 04:30 PM | #8 |
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Re: 700R4 With No Lockup?
IT wont harm 4th , 4th gear is hydraulic and as long as the cable and transmission are in good shape you should be good .
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04-06-2012, 06:06 PM | #9 |
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Re: 700R4 With No Lockup?
So to wire up the lockup all I need to do is get the vacuum switch and run my wires from there to the transmission?
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04-07-2012, 05:26 AM | #10 |
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Re: 700R4 With No Lockup?
I just had my 700 tranny rebuilt and all I have to hook up is the tv cable and a key on power wire to the tranny. No more switch on the brake pedal.
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04-24-2018, 05:43 PM | #11 | |
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Re: 700R4 With No Lockup?
Quote:
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04-24-2018, 06:34 PM | #12 |
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Re: 700R4 With No Lockup?
why not try to fix your trans issue instead of driving it and hoping it may last that next mile......most likely GM did not design the 700R4 to be driven in 3rd all the time...Good Luck.
When you say no wiring to connecter, you mean no wiring on the outside of the transmission correct ? |
04-25-2018, 10:02 AM | #13 | |
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Re: 700R4 With No Lockup?
Quote:
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04-25-2018, 10:08 AM | #14 |
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Re: 700R4 With No Lockup?
just want to drive this thing and not interested in fixing 4th right now, just want to know if I can safely drive this in 3rd.
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04-25-2018, 02:32 PM | #15 |
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Re: 700R4 With No Lockup?
Good Luck....
QQ..... Last edited by YoungPup1977; 04-25-2018 at 06:29 PM. |
04-25-2018, 04:48 PM | #16 |
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Re: 700R4 With No Lockup?
Thanks, but I don't do this for a living and not willing to experiment on something that still works and is good enough for me.
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04-26-2018, 10:40 AM | #17 | ||
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Re: 700R4 With No Lockup?
Fixing it to work properly isn't experimenting. I wouldn't drive it around only using 3rd if it was me. If that was the case I'd just install a TH350.
Reread post #5 in this thread and then decide for yourself if you should not hook up the lockup... Gary
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04-26-2018, 11:13 AM | #18 |
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Re: 700R4 With No Lockup?
Sounds like you should re-read post 5.
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04-26-2018, 11:31 AM | #19 |
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Re: 700R4 With No Lockup?
How would you fix it? How do you get it to shift in 4th? TV cable is right and dipstick level is full in park, checked hot after a 15 min drive. Give me a straight forward one and done answer. Then tell me why my solenoid clicked once and never again while I gave pin "a" 12 volts and pin "d" chassis ground and my 10 amp fuse didn't blow. Or are you talking about sending this off to a trans shop so they will ask me for $1000 to rebuild it? Transmission shops wont spend hours checking and tinkering because they cant afford a bad rep if it tears up a week later. Dropping a pan and fiddling with a 35 year old transmission isn't an option for me. Anything over $400 in labor and parts is a waste of time and money on a 35 year old transmission with who knows how many miles and who knows who did what to. The question is: Can I drive it in 3rd, since 4th without a lockup will burn it up. 4th ain't working and lockup needs fixed. It appears from how nasty and gunked up the connector was that the connector hasn't been used in decades.
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04-26-2018, 11:43 AM | #20 |
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Re: 700R4 With No Lockup?
...................1st....2nd...3rd...4th
Powerglide....1.76 1.00 TH350..........2.52 1.52 1.00 TH400..........2.48 1.48 1.00 200r4...........2.74 1.57 1.00 0.67 700r4...........3.06 1.62 1.00 0.70 People drive in 3rd all the time...towing and mountain driving and track.... if a "4th gear lockup only" kit is offered, im assuming 3rd gear gets the lubrication it needs and there isn't the TC spin that causes excess heat like in 4th. The whole reason for lockup in 4th is to clamp the TC to keep from spinning and also open up lubrication to the planetary gears. 3rd doesn't need lockup, so i'll be fine. So the answer must be YES, it's ok to drive it in 3rd and avoid $500-$1000 to fix this 700r4, to let me save $5 at the pump. BTW, I love my th350 in my other truck and wish this was a th350 too.
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04-26-2018, 12:15 PM | #21 |
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Re: 700R4 With No Lockup?
I thought I responded to one of your transmission conversations but maybe not.
You can run the 700R4/4L60 in third forever. In third there is really no reason to lock the converter clutch. If your 700R4 has good second and good third, there are very few reasons why there wouldn't be a 3-4 shift. Usually, governor valve or 3-4 shift valve line up in the valve body. Your broadcast code began with a "Y"? That wasn't originally a truck transmission so it was from a fuel injected ECM controlled converter clutch vehicle. IIRC, power from brake switch into A, ground to energize solenoid on D and 4th gear input to ECM on B
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04-26-2018, 12:35 PM | #22 | |
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Re: 700R4 With No Lockup?
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04-26-2018, 12:46 PM | #23 | |
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Re: 700R4 With No Lockup?
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04-26-2018, 01:49 PM | #24 |
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Re: 700R4 With No Lockup?
All shifts including Fourth gear are hydraulic. Sometimes the weighted head comes loose on the governor and the valve will not have enough travel. It will not shift past 3rd. Not too hard to remove and check.
Lockup is different and electrically controlled through the TCC solenoid. Yes, on fuel injected models the 4th gear pressure switch tells the ECM when the trans has shifted to 4th and the ECM then grounds D to lock up the clutch. My experience is the TCC solenoid has very little to no noise when energized.
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04-26-2018, 02:53 PM | #25 | |
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Re: 700R4 With No Lockup?
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