700R4 Transmission Questions/Issues

[Burbinator86]

Hello all. I’m new to the forum and new to Squarebodys. I have a 1986 GMC Suburban K1500 with a 350 and a 700R4. I’ve had it roughly 2-3 months and it hasn’t been a daily running rig in 15 years (not my doing).

I bought it and got it to running and driving shape but im having some issues that I need help with. Before I get into it i’ll mention nothing Tranny related has been touched besides filling the ATF back up and replacing the tv cable.

The issue: When I drive it, it seems to rev a little high before shifting. Granted I don’t have a Tach but I’d Guess-timate around 2500-3000 rpm. It shifts 1-2 at around 15mph, 2-3 at 25, and haven’t tried fourth I don’t want to damage anything. Added to that is it seems to shift really soft. Like almost not able to tell it’s shifted at all. More between 2-3 than 1-2. And this is light-moderate on the throttle in speed limits 30 or less.

And when I go to look at adjusting the TV Cable, it’s to the point of no more adjustment (pulling it out). I have the Edelbrock TV Cable mounting bracket on my 1406 carb.

My thoughts on what it could be is:

Something related to the TV Cable? A vacuum line issue as some little ones are disconnected?

Any help is greatly appreciated.

Pic is for attention.

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[Ricko1966]

Hello all. I’m new to the forum and new to Squarebodys. I have a 1986 GMC Suburban K1500 with a 350 and a 700R4. I’ve had it roughly 2-3 months and it hasn’t been a daily running rig in 15 years (not my doing).

I bought it and got it to running and driving shape but im having some issues that I need help with. Before I get into it i’ll mention nothing Tranny related has been touched besides filling the ATF back up and replacing the tv cable.

The issue: When I drive it, it seems to rev a little high before shifting. Granted I don’t have a Tach but I’d Guess-timate around 2500-3000 rpm. It shifts 1-2 at around 15mph, 2-3 at 25, and haven’t tried fourth I don’t want to damage anything. Added to that is it seems to shift really soft. Like almost not able to tell it’s shifted at all. More between 2-3 than 1-2. And this is light-moderate on the throttle in speed limits 30 or less.

And when I go to look at adjusting the TV Cable, it’s to the point of no more adjustment (pulling it out). I have the Edelbrock TV Cable mounting bracket on my 1406 carb.

My thoughts on what it could be is:

Something related to the TV Cable? A vacuum line issue as some little ones are disconnected?

Any help is greatly appreciated.

Pic is for attention.

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Do you have a correction arm on the carb,and the correct bracket on the manifold?

 

[Turbo4whl]

I am not the 700R4 guru, but getting the throttle valve cable adjusted correctly is very important. Since you are running an aftermarket carburetor it might be harder set correctly. Geometry of the throttle linkage and the cable mounting distance may not be the same as the factory quad.

This may not work for you, but to get the right cable pull on the Holley, I added a crimped on spacer to keep the cable adjuster in range. You can see it on the end of the cable. I will add, this took several attempts with different length spacers to get it right.

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