Question about 1992 Chevrolet G20

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1988 G 20 TRANS shift problems

1988 G 20 350 TBI 700R4 TRANS shift fine 1 and 2 shifts to thrid neutrals out and back to second . step on it and force shift to 3rd and 4 .. vechicle sat for a year .. any help or a rebuild ??

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Get it serviced as the valve body might be sticking from lack of use!

Posted on Jul 18, 2009

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I have same van. its time for a new 700r4. sad but true. once you loose drive or third, its over. go with a salvage yard or craigs list for a good deal. good luck

Posted on Jul 18, 2009

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Transmission shifts very hard


Check your transmission fluid level as soon as possible.
If you are experience hard transmission shifts, it is possible that the only problem is a low transmission fluid level. Low transmission fluid level can change the operating pressures of the transmission as well as reduce the amount of lubricant present between the clutches and bands and raise transmission temperatures. All these things can cause hard or jerky shifting. You need to identify why the transmission has a low fluid level and refill it as soon as possible.

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Hows the fluid Look? Red, brown, black? how's it smell? like trans fluid or burnt? What do you have? the 350, 350 turbo, or 400 transmission? Fairly easy to rebuild. By chance( I don't know when they came out) the 700R4. I bit more difficult to build. Find someone that knows about these. Buy the manuals and upgrades. Follow them closely. ATSG.com has them.

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I just had my 700r4 tranny rebuilt again! The guy I purchased my truck from just had it rebuilt 3 yrs ago. It had a hard second shift and he told me that was from the shift kit they put in it. Well, that...


The throttle valve cable controls the transmission pressure. Adjusting this cable is the most important step when installing a 700R4 or 200R4 transmission.

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when has the last time you had a trans serv. done on it? if you take it to a shop the will tell you that you need a rebuild. thrid gear and over drive are about burned up.

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MY TRANS WONT SHIFT INTO THIRD GEAR UNTIL IM DOING 45 MPH IT SHIFTS FINE IN FIRST AND SECOND GEAR WHEN IT IS IN SECOND GEAR AND WONT SHIFT TO THIRD I CAN PUT IT IN N AND BACK TO OVERDRIVE THEN IT SHIFTS.


Most likely your shift cable (from the selector to the transmission) is worn, maybe needs lubrication. Mine had a similiar problem, but had to shift it into neutral and back up to get it in reverse. A new shift cable solved the problem.

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I have 700r4 trans. shifts from 1to2 but won't shift 2 to 3


Since it still moves in first and second, likely the end-play inside the transmission is enough to cause a shaft seal to bypass pressure. (internal thrust surfaces or washers worn). Being that old, it most likely is in need of a rebuild. If that's the first time you've needed to do trans work, you have gotten your moneys worth there!!

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91 GTA 350 Cannot go in reverse; when I shift, the car 'jumps'


Sounds to me like the valve body is sticking causing the low/reverse clutch pack to stick. Might try a fluid/filter change. If all else fails, at least the 700r4 is a cheap/easy transmission to rebuild.

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1 Answer

1994 K1500 CHEVEROLET BLAZER wont move in any gear


Hello;
Your trans is the 4L60E. A really good trans but they do go out. I would start by pulling the oil pan on the trans and seeing if anything is there. The obvious is a large debris field showing the trans is in need of a rebuild. Specialized tools are required for these units and not recommended for a novice. I would also look to see if the shift linkage has broke inside the case. Have someone step on the brake while you look under the trans and shift the gear shift through the entire range. I have seen the cables brake in the casing and have also seen the rooster come come loose, break, and disengage. hope this helps.
Thanks;
Rich
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Mar 21, 2009 | 1994 Chevrolet K1500

3 Answers

HOW DO YOU ADJUST KICK DOWN CABLE FOR CHEVY 1500 1988


700R4/2004R TV Cable Adjustment Instructions WARNING! IMPORTANT NOTICE!
POST INSTALLATION ADJUSTMENT.
It is imperative that after your new TCI® 700R4/2004R transmission has been installed that the Throttle Valve (TV) Cable gets adjusted properly, DAMAGE WILL OCCUR to the transmission, voiding the warranty. If you are unsure about the proper adjustment needed, call TCI®'s tech line for help or refer to a General Motors service manual for additional information and reference.
Function of the TV Cable: Many people believe that this is a detent downshift cable and that this is the only function that the cable performs. In actuality, the TV Cable controls line pressures, shift points, part throttle downshifts and detent downshifts. The cable functions similarly to the combination vacuum modulator/cable systems found on other automatic transmissions.
TV Cable Connection: If you are retrofitting your TCI® 700R4/2004R transmission in place of a different model transmission (i.e. TH-350 or TH-400) it is imperative that you follow the TV Cable bracket fabrication instructions. If your TCI® 700R4/2004R is replacing an original 700R4/2004R then skip to Step 2.
Step 1 Obtain a cable that is designed for use with the 700R4/2004R transmission. The TH-350 and older TH-200 cables are designed differently and will not work. A salvage yard cable may work but be forewarned: There are about 30 different length cables found on stock vehicles and a cable that is too short in your application will not work. Also, used cables could have a number of problems as well, including stretched cables, damaged sheathing or housings or mutilated cable ends. TCI® recommends our universal TV Cable (TCI® 376800) that is designed to work correctly in any 700R4/2004R application.
gm_tv_fig1.gifStep 2 With the carburetor/throttle body end of the TV Cable disconnected, pull the link out of the transmission and fit the cable end to the link as shown in Figure 1. Push the TV Cable sheath into the seal in the transmission and tighten the 10mm retaining bolt. If your vehicle has a factory installed bracket for the TV Cable then skip to Step 4.
Step 3 Install a bracket that will allow the TV Cable to mount to the carburetor/throttle body. TCI® carries two brackets: TCI® 376700 works with Rochester Quadrajets, Carter AFBs or Edelbrock Performer carburetors. TCI® 376800 works with most Holley carburetors.
If you are using a Chevrolet TBI/TPI induction system, then correct brackets can be obtained from a salvage yard or a local car dealership.
Figure 2 demonstrates the correct geometry for the TV Cable mounting position. Use the following procedure to determine if your ADJUSTER MOUNTING POINT is correct.
a. Push in the Adjust Tab and retract the Slider in the direction shown in Figure 3.
b. Without allowing the Slider to move, pull the cable until it stops and measure from the mounting bracket to the cable end. Add 3/16" to this measurement and that will determine the ADJUSTER MOUNTING POINT distance at full throttle (WOT).
gm_tv_fig2.gifc. Also note in Figure 2 that the distance from the throttle shaft to the cable end is referenced. This distance must be between 1 7/64" and 1 1/8"! The cable end mounting point should follow a 78° arc between closed throttle and WOT in order to achieve the proper amount of pull on the cable.
Step 4 Adjustment of the TV Cable on a gasoline engine. For a diesel application go to Step 5.
a. Adjustments are made with the engine off. Locate the Adjust Tab on the cable housing. Press in the tab and push the slider as shown in Figure 3.
b. Release the tab and rotate the throttle lever to WOT and the cable will self adjust itself as evidenced by a few audible clicks. Release the throttle lever and check the cable for any signs of binding or sticking.
gm_tv_fig3.gifc. Road test the vehicle. Under moderate acceleration your shift points should be close to the following:
1-2…………………15-20 MPH
2-3…………………25-30 MPH
3-4…………………40-45 MPH
If the cable is adjusted too loosely your transmission will exhibit soft, stacked shifts (not spread out). DO NOT CONTINUE DRIVING VEHICLE IF THIS HAPPENS! Immediately readjust cable. If you continue to have problems, please contact TCI®'s tech department for assistance.
Step 5 Adjustments of the TV Cable on a diesel engine.
a. Adjustments are made with the engine off. If equipped with cruise control, remove the control rod.
b. Disconnect the TV Cable end from the throttle lever.
c. Loosen the locknut on the pump rod and shorten several turns.
d. Turn throttle lever to WOT and tighten the pump rod locknut.
e. Lengthen pump rod until injection pump lever contacts the full throttle stop.
f. Release the throttle lever and tighten the pump rod locknut.
g. Remove pump rod from the throttle lever.
h. Reconnect the TV Cable end to the throttle lever.
i. Press in the Adjust Tab and move Slider as shown in Figure 3.
j. Release the tab and rotate the throttle lever to WOT and the cable will self adjust itself as evidenced by a few audible clicks. Release the throttle lever and check the cable for any signs of binding or sticking.
k. Reconnect the pump rod and cruise control throttle rod, if equipped.
l. If equipped with cruise control, adjust servo throttle rod to minimum slack.
m. Road test the vehicle. Under moderate acceleration your shift points should be close to the following:
1-2…………………15-20 MPH
2-3…………………25-30 MPH
3-4…………………40-45 MPH
n. If the cable is adjusted too loosely your transmission will exhibit soft, stacked shifts (not spread out). DO NOT CONTINUE DRIVING VEHICLE IF THIS HAPPENS! Immediately readjust cable. If you continue to have problems, please contact TCI®'s tech department for assistance.

Feb 16, 2009 | 1988 Chevrolet C1500

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