Hello all-

Unless you have a Q-jet that was originally designed for use with the 700 or 2004R, the linkage geometry will not be correct, and it will never work properly.
It's more likely the TV(throttle valve) in the valve body is hanging/sticking at times, causing the shifts to be late. That happens a lot, since any small piece of doo-doo can hang the valve. Working the throttle moves the cable, which moves the linkage in the trans, which moves the valve, which will sometimes un-stick it. My guess is that the problem lies with the valve itself, rather than the cable, tho the cable does need to be set up correctly. You will need to get/fabricate an adapter bracket for the carb...there's really no way around that. That will solve the geometry issue.
 The only way to solve the hanging valve problem is by removing the valve body, cleaning it well, and installing a "helper" spring behind the throttle valve. There are a couple of different designs, and some come in "Shift Kits". I have seen some of these springs actually cause the valve to hang if they are not made/installed properly. I've also seen some valves get locked by drilling holes in the plate("shift kit") too large, which can hydraulically lock the valve down until the engine is shut off.
Don't know what the shop did to the trans, as far as "shift kitting" it, so it's hard to say, but my money is on the valve hanging up.

I bow to Joel's (ASE certified) knowledge about the inner workings of the transmission, but I can tell you from experience about the linkage.  Q-jets do not have a hole in the right place for the TV cable to mount.  You must drill a hole, or make a bracket with a hole, exactly 1 3/32 inch from the center of the throttle shaft, and centered for even travel.  Incorrect travel will burn up a 700r4 in a hurry.  It needs to be adjusted for firm shifts without banging, but still reach full valve opening at WOT at the carb.

I believe Bowties Overdrive sells a bracket that adds on to your Q-jet, or you can figure it out for yourself.

Larry

Yep...there are, of course, Quads that DO have the correct set-ups for the TV cable....just not(factory) on a Corvette. So, in order to have one that is workable, you'd have to swap the carb.
Much easier to either fabricate, or purchase, an adapter for the carb. I have used the Bowtie kits a few times, and they work fine. You definitely have to positively identify the carb you have(by cast/part number) to get the Bowtie kit that will fit/work properly.
Adams' Apple2010-07-01 10:05:10

Joel & Larry:

How'd ya make out Bobbi?

LOts of information on how to setup the TV cable can be found at http://bowtieoverdrives.com

The factory installed 700R4 in my 82 is like no other I have ever driven. First odd thing I noticed it can not be locked into first gear, why I do not know. Next it will allow the TCC to lock up in 2nd as well as 3rd and 4th. It is also the smoothest shifting 700 I have ever driven. whether you are at full throttle or just idling along it shifts perfect, GM built it different for the Corvette and I like the way it performs. 

Paul:

'Bracket", or "Adapter"?

Look at the kit from BTO. The adapter is the gold part in the pic(it's three separate pieces that "sandwich" together to make the adapter). It comes in the kit, but I think you may be able to get just that part by itself. Again, identifying the carb is essential for getting the correct adapter.
Adams' Apple2010-07-09 20:25:08