1994 Dodge Van transmission problem

I have a 1994 Dodge full size van with a 318 engine and an A518, 4 speed (with overdrive), tranny. I've had this van for a few years and it has leaked fluid and made a little noise since I purchased it. I
made the mistake of putting some transmission additive for "high mileage" transmissions. A few days later the tranny would not work. I dropped the pan, changed the fluid and filter, adjusted the bands as per manual. I drove it around 10 miles and the tranny started sounding like metal grinding, very loud. I immediately took it out of overdrive and the noise went away. I've drove the van without overdrive for several weeks. Recently I backed off the kick-down band adjustment 1/2 turn. I test drove the van and it shifted smoother, but the overdrive still made a lot of noise. I also looked at the electrical wiring to see if anything looked loose. I let the van sit a few hours and the tranny would not shift out of 1st gear.
Any idea as to where I need to look first?
I also have a 1989 tranny, I think it's a A998/99, that I would like to use temporary while I work on the original. What problems will I encounter outside of finding a drive shaft that will fit?
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The transmission mount won't work with the older one. Hopfully you've got a crossmember and mount from a three speed truck?
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BigIronRam wrote:

Thanks BigIronRam! I do have the transmission crossmember and mount. I also have the complete 1989 van to rob parts from. My concern is the wiring. Is there any wiring connection differences between the two trannys that could cause a problem? Again, I appreciate your response!
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I think you're good to go! There's only one electrical connection to worry about, a three pin connector that controls overdrive and lockup, just tie it up out of the way. The computer will set a code, 37 if memory serves, it's not a problem, even the V-6 three speed vans set that one. I hope the van also has the yoke on the driveshaft, the A-500 uses a different one than the A-9xx trannys.
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BigIronRam wrote:

It'l be a few weeks before I pull out the original tranny. Before I do I wouldl like to know how to verify operation of the solenoids. I know I need to drop the pan, but where do I go from there?
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