I am trying to figure out whats going on with the 700R4. THe trans. and engine are from a 85 S-10. I have looked at everything, including calling a Chevy dealer to make sure this is a 700R4. It is.
The Problem--The trans will not take off if the shifter is in OD. The engine will rev to the moon as if in neutral. Put it in D, and it will work, but holds 1st for a long time, then shifts to 2,3. While cruising at 35-40, shift to OD, acts like its in neutral again. Get up to 45-50, shifts to OD just fine. If we get it in OD, then come to a stop, and take off, it does the same thing, just revs, no go.

What I have done--I put a new TC lockup switch in it, changed filter, fluid. Still does it. What am I missing? I don't know to much about 700R4 trans. I'm more of a TH350 person. The TV cable is not adjustable. It, and the throttle cable are mounted on the pass. side of the carb, TB whatever it is. I haven't looked. But it does not have the normal clip you pop up, go to WOT, then snap it back down. This is a non-adjustable cable. I have checked the shifter linkage as well. It works fine, no half in/ out spots.

Does anyone have any ideas on what could be causing this?

Thank you,

 

The throttle cable and TV cable are mounted to the PASSENGER side of the carb??? I'm missing something here...a Holley carb has the throttle linkage and TV cable connected to the drivers side. So does a Q\Jet and all F-Bodies that I have seen. You've got a goofy throttle setup if you have it somehow attached to the passenger side. Fix it.

You must have a functioning, adjustable TV cable for a 700R4 to work properly. Here's what I would do.

1) Order the correct TV cable for a 84-86 carburated Camaro\Firebird ( LG4 engine option ). Readily available from GM and jobbers.

2) Order a universal throttle\TV cable bracket from Summit or Mr gasket. Better yet, order a factory GM bracket for an 84-86 carburated or visit the boneyards and pull one off a wreck. This is by far the best way to go.

3) Order a Holley Transmission Kickdown stud. Part # 20-40. Attach this in the small hole below where the throttle connects. Look at a Q\jet to get the correct orientation. Factory Camaro TV cable will snap onto this.

I think when you have a TV cable hooked up and adjusted properly, then everything should work fine. Be sure to check out how the TV cable mounts to a Q\Jet...then try to get this as close as possible on your Holley. The angles and dimensions of where the TV cable attaches to the throttle lever on the carb are critical.

 

I understand what you are saying about the adjustable TV cable, but this one is not. There are only 2 cables, and they are both on the pass. side. I know S-10s are set up this way. That might be why they kept it there. Any more ideas? I was on the same line of thinking also about the TV cable, but it looks pretty factory to me. Not for a Camaro, but what the S-10 had.

 

Okay, heres the part that was omitted. This engine, trans is still attached to the S-10. The trans problem now is in the S-10. We want to fix it before we replace the old Maro trans/engine. I didn't come out with this for fear of it not being totally 3rd gen related, and getting locked. I have no other real resources for info on this problem. Thats why the cables are on the pass. side. I know they go on the drivers side in the car, but we want to fix this before we do the swap.

Thanks,

 

Well..that clears a lot up. All you had to say is that you have a problem with this Tranny that you want to switch into your Camaro. I don't think you would have gotten the post deleted for that.

You're still going to have to order the parts I listed.

Your problems still point to problem with TV signal. On re-reading the post it looks like the TV valve may be stuck wide open. Possibly a little burr or piece of trash inside the valve.

With the TV valve stuck at WOT your 1-2 and probably 2-3 shifts will be very late. Is the 1-2 shift harsh as well? The reason it won't shift from 3-4 is that you do not yet have enough line pressure, which is controlled by the governor circuit to balance out the signal from the TV circuit. At least that is what I believe may have happenned.

Here's a quick check to see if the TV valve is stuck. Detach the TV cable from the throttle lever end. The inner cable should "snap" back into the housing. Now pull on the TV cable by hand untill it extends all the way. There should be considerable resistance to this and it should 'snap" back sas soon as you release it. You are compressing the TV Valve spring inside the tranny.

Now if the TV Valve is stuck ( quite common ) the cable may have a lot of slop in in.....nothing pulling the cable back on the tranny end, because the TV valve is stuck way up in the bore. If you can move the cable easily back and forth with little or no resistance that is a sure sign that the TV Valve is stuck in the WOT position.

Sometime yanking on the cable a few times and releasing can free up the TV valve. Otherwise, drop the pan and check the operation of the TV valve from there. You can probably remove the TV valve and sleeve without having to remove the valve body. Not 100% sure on this though. If it is binding, remove valve and sleeve and polish out the burr or remove the trash.

Good Luck.

 

Sorry I wasnt more up front. I can see that would have cleared up some confusion. I will check that ASAP. THanks for the help.

 

BTW...might save you some time and trouble. Is this a V6 S10 tranny? If so save your time and money. Not nearly as strong as a V8 700R4. What year is the tranny as well?

 

The trans is an 85, but its behind a 2.8. I know it wont work for a V-8. I'm trying to help a guy out and "swap this over to a Camaro with a bad 2.8/auto!!!"

Thanks.

 

Ahhh....gotcha. Hope you find the problem.

 

Okay, I followed your instruction, and as of now, the OD is fixed. Thank you so much. Now the bad news!! I will take the responsibility for this, as I was the only one who touched it. After I put the valvebody back in, hooked everything back up, the shift detent is off by 1 notch. By the shifter, "R" is nothing, "N" is reverse, "OD" is neutral, "and "D" is overdrive, and so on. I thought the linkage was messed up, so I unhooked it, trusted the guy with my life, with the vehicle running, I manualy turned the "U" bracket on the trans. Same deal. The detent is still off according to the order of R,N,OD,D,2,1. This tells me something inside is wrong. Any ideas? I didn't take the detent jagged looking thing off. Just the little rod that went from that bracket to the piston in the VB. From what I saw, that could only go on 1 way. I need help, anyone got ideas?

Thanks,

 

No ideas? I'll pick the brains of our tranny shop.

 

Are you planning on moving both the engine and tranny from the s-10 to the camaro?

If so you better do some checking, I was told there were issues with that... like it won't fit... something to do with how the oil filter would hit the body or something... but I can't remember it was a long time ago... but that was back when I was 'fixing' my V6 instead of transplaning my V8...