There is no kickdown cable adjustment on the 3rd generation (A343F) transmission. There is an
excerpt from the service manual in the Resources section, specifically for the transmission, so you don't have to slog through the entire manual. There is also a 1997 service manual in there, which you should download, if you haven't already.
The problem matrix for the A343F is broken down so that you can check the easiest to find (not necessarily the most likely) first, starting with
1) Electronic control, proceeding to
2) On vehicle mechanical troubleshooting, and then to
3) Unit repair (transmission removal and disassembly).
Here's the problem matrix from that excerpt:
View attachment 3758032
View attachment 3758037
The numbers at the bottom are the order in which you proceed with troubleshooting. The numbers at the top f the column indicate the page(s) where the recommended procedure is found.
@bakerbrian
I'm going the long way around because you didn't provide very much diagnostic information, so anyone's recommendation is a guess.
1. From the Maintenance schedule "B", if you haven't changed your ATF in two years, it's time to do that. Summit has the best price on ATF for the A343F right now. You'll need 12 quarts. Draining the pan will not solve any problems and only cost money. At the risk of belaboring the point, image changing the water in a swimming pool (of any size) by taking a bucket of water out of one end and replacing it with a bucket of water in the other end. That's what draining your pan does for the transmission. See the next post for a summary on how to flush your transmission safely and thoroughly.
2. How many miles are on the truck and the transmission, if it's not the original unit and has been overhauled./rebuilt?
3. What kind of driving do you regularly do?
4. There is no filter to change in the A343F.
5. Changing the solenoids is a waste of money if there is nothing wrong with them. You won't know that until/unless you remove the pan and
check each one functionally. The procedure is in the service manual. That would not be my first step, unless I knew the fluid was usable (had been changed in the past two years and the transmission had not seen use conditions in Maintenance schedule "A").
6. Lastly, the manual indicates the first check is the solenoid function of the Shift Lockup (SL) circuit. This assumes the fluid is in good condition and no other problems exist. The troubleshooting matrices always assume the problem is a single point of failure; they were written for dealer technicians servicing trucks in the first 5-7 years of service, not 35 years after initial delivery. You have to make allowance for the general age and condition of the truck when troubleshooting.
Also, there's no reason not to check all the solenoids while you have the pan of