700R4 transmission

The TH (turbo-hydramatic) 700R4 was developed for use after 1982 in GMC and Chevrolet cars and trucks.

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will not shift into 3rd just slips.

I installed a 700r4 in my 60 chevy. It only shifts 1st to 2nd it slips when it goes to 3rd. does this have any thing to do with the TV cable not being conected?

Answer this question I have this problem too

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Jack, mine has that problem too, slips after 2nd. I am about to put another 700R4 in there and I can report back after the install. - Frank

by 040304

My 1982 Vette is now having the same issue. I changed the fluid and filter, drove about 30 miles and now it will not shift into 3rd. She only has 40K miles on her. Is this common after a fluid/filter change for this tranny?

by Ray

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Jack,

Check out this thread about the 700R4. I am having the same problem with mine and I am replacing it with a unit from Craigslist.

Good luck

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Just a heads up for you guys. Being a former Chevrolet Technician I can tell you that is a common failure on the early model 700R4. Up until 1993 the trans used a TV cable for throttle input to the trans. In 1993 the trans was redesigned and now has shift solenoids for shift control. No longer does it have a TV cable or Governor. The Governor was for road speed and the TV cable was for throttle input. Now the VSS (vehicle speed sensor) and the TPS (throttle position sensor) are the inputs to the TCM or PCM depending on model year to control shifts. The electronic control module will calculate the proper shifts on variations of these two inputs. The early 700R4 had numerous design changes to make it more robust. But one of the best changes was when it went to electronic shift control in 1993. The line pressure was now also controlled electronically and enhanced the longivity of this trans. I speak from personal experience as we repaired the early model frequently for burned 3-4 clutch plates which is very likely the problem the earlier posters had. At times it was not known just what caused the loss of pressure to burn the plates as there are a number of factors involved. I just came across this site and I see the posts are old but decided to add this note in case someone in the future would come here. Good luck :)

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Thank You For IMFO.

by georgeakrn2

Thankyou for the info. I have a 1989 chevy van with this same transmission...same problem. No third gear. Today I just put it in the shop for a 1200 dollar rebuild. For a few months I couldnt afford this...yet I needed my vehicle on a daily basis. Hence...I got very good at driving with just first and second without over-revving. Best to stay on back roads with speeds of no higher than 25mph...until transmission overhaul can be made.

by jakestarrastrella

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There are no "shifting modules" inside the transmission. As Mr Zimmerman stated, the later units(renamed as 4L60E) used electronic shifting and pressure controls. The module which controls the transmission may be part of the PCM(controls engine and transmission) or a TCM(controls just the transmission). The transmission in this case will contain pressure switches, a torque converter clutch solenoid, shift control solenoids and a duty cycle controlled pressure control solenoid.

The earlier 700R4 and non electronic 4L60 were controlled by a hydraulic valve body and received throttle input, as stated above, from the TV cable. This cable is often mistaken for a "kick down" cable as used in the TH350. The TV cable in the 700 plays a much more important role than simply commanding forced down shift. It is crucial in controlling line pressure to the hydraulic components of the transmission and incorrect adjustment will affect shift behavior and leads to early failure.

The 3-4 clutch pack is a common failure item in this transmission, due mostly to the design of the input drum where the 3-4 clutch resides. The clutch pack installs at the rvery rear of the drum and is held in place by a snap ring. The thin backing plate of the clutch holds back the apply pressure with only the snap ring to keep it in place. The backing plate flexes under this pressure rather than maintain even pressure on the clutches. The clutches slip and burn up.

For years, builders of this unit have tried to work through this, using various hi performance clutch designs. There is a new part available from the Sonnax company named the "Smart Tech input drum that appears to offer a permanent solution to the problem. This is especially important when the unit will be used in a racing or heavy duty application, behind a hi output motor.

There are several other items that affect the 3-4 clutch as well. The 3rd gear accumulator, which is part of the 2nd gear servo assembly, absorbs the shock of the 3-4 clutch apply. The accumulator is a piston with a sealing ring around it. If the sealing ring fails, apply pressure to the clutch will bleed off and the clutch will slip and burn. If the 2nd gear band servo doesn't release quickly enough when 3rd gear applies, the 3-4 clutch pack will burn up. If the trans oil pump doesn't produce sufficient pressure, the clutches will slip and burn. The input shaft is also a conduit for oil pressure from the pump to the various clutches. Sealing rings are used to isolate the circuits from each other. If these sealing rings leak. Pressure will bleed between circuits and cause clutches to slip and burn.

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Is a good explanation I try other sugestions and this is the most right . I have the same problem with a 4L60E 2002 Chevy Silverado 4.8 L. The sugestions give I'm going to do ( Sonnax)

by Ramiro

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The TV cable MUST be installed and connected to the throttle arm and adjusted properly for the transmission to operate properly. Failure to do this will result in slipping shifts and poor performance and will eventually result in transmission failure. Cable brackets and cables are available on Jegs or Summit to enable proper TV cable geometry/travel.

Adjustment is easily done once the cable is properly installed, press in on the side of the adjuster body (a button like thing, its metal) on the throttle end and push the adjuster all the way into the adjuster body. Release the "button" and slowly open the throttle completely by hand, it will be a bit tight doing so. The adjuster will come out of the adjuster body to the proper distance, and you're all set.

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thanks for all the new info do think that i have the same problem as you talked about above. i have a 1990 s10 4x4 with 4.3 motor. it shifts great but then starts to slip in 3rd and over drive almost as if its in neutral but if i shift it to 2nd gear then back to drive it works then starts to slip again and only revs when i give it gas so i shift it down by hand again to 2nd and back to drive it works for a few then it does the same thing like its not in gearthe fluids good not burnt and all gears work fine just acts like its going in and out of gear can you give me any clue what may be the problem with it buddy

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I have had the same problem before.. It sounds like the seals are leaking and not applying adequate pressure to the clutch packs. I know it's a no no but I put about a cup and a half of brake fluid in mine and it made it work.. When it quits, hopefully it will be warm and I will rebuild or replace it.. I was not out to try it.. Some people say that it makes seals mushy.. It fixed mine.. for how long I am not sure..

Good Luck

Dan

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4 speed with lockup

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Two possibilities. The TV cable is adjusted improperly. There could be air in the valve body fluid. Do a search for adjusting the TV cable first.

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before you replace it there is electronic shifting modules in it you might want to drop the pan replace that module and your filter

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does the 700r4 have three or four gears. Is it a three speed with a lock up converter or four speed with a lock up converter?

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Hi guys im kinda new here but i have a couple of questions, im buying a 1980's chevy k20 with a 350 block which does not run because of a battery problem. The guy im buying it from told me that he has a 700R4 in it but it slips on the 3rd gear. I was wondering how expensive that would be to fix if it was worth fixing. Please keep in mind that this is my FIRST truck and I have little knowledge on this specific type of transmission.

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I have a 1998 Chevy s10 zr2 automatic replaced the trans and mine is doingh E exact same thing any suggestions

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3-4 clutch is slipping no matter if its a 4l60 (92 and older) or a 4l60e (93 and newer) plain and simple. Trans must be removed and input housing pressure checked. Turbine seals can leak, accumulator seals can leak, actual bulletin for adding ground to pcm in 97s I believe, for repeat trans failures. If same clutch is slipping over and over, obviously there is a pressure loss somewhere. Done hundreds of these trans, 3-4 clutches and sun shells over and over failures. She'll failure causes no reverse and 1st and 4th only.

by vintagedog55

Mine stays in first it won't go to second or 3 ????

by jj

If it is gm 87-92 th700r4/4l60 with second type auxiliary valve body than it can be a lot of things.first check tv cable and tv plunger to make sure it is not stuck.this will require taking pan off.then check governor to see if gear is stripped and that the cross pin is installed.also check to see if the valve moves freely when weights are actuated. Next pull valve body and see if check balls are proper place and air test .check to make sure all valves are moving freely and don't stick.if that dose not fix it than ur clutches are burned up.a bad torque converter can cause this, vacum leak, line blockage, tv plunger sticking,stripped splines on input shaft, and so on.do those first three things I told you and air test clutch packs.if this dose not fix the problem than you will have to overhaul or rebuild.in that trans its all about pressure, if there is a problem shifting than somethings messing up pressure.

by Scott

I got a 1987 chevy v10 with the 5.7 got it a week ago got it running today (positive cable was burned up off manifold) runs good now but no movement when shifted into any gear in 2 4 n or 4l. But just checked fluid it is way over what it should be in neutral what should I do?

by Jory Vernetti

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jack will be eternally grateful.

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