I used the "aqueous" cleaner (from northern tool) in a metal 40 gal HF washer I got since I didn't want fumes in my basement. I noticed two downsides.
1. After a few months I noticed a nice green slime on top of the solution which you had to skim off before using it. It also smelled badly.
2...
....or you could just pull the codes off the computer. You can use the jumper wire method on the test plug on the right side of the engine firewall and count the flashes on the check engine light. A two minute google search will bring up were to place the jumper wire and what all the codes mean...
The catch is starting in 94 and going til 2000 there is no cable. There are still speedo gears in the transmission but no cable, I believe its the VSS system of sorts.
If the gears have been changed in the rear to 3.73 or something close they may have put in a 23t gear in the trans which is a...