1997 Chrysler Town & Country, codes; p1698, p0734, p1782, p1788, p0732, p1787, and p0700? Plz help

You should NOT be driving this vehicle if it is in limp mode. You will need to pay a Good Auto-electrician to look at this problem.
All modern cars and trucks are fitted with electronic control units referred to as the PCM and the TCM. P1698 refers to these units not communicating properly with each other. So the vehicle goes into a safety set up until the problem it fixed, Limp Mode.

P0700
P0700 OBD II Trouble Code Transmission Control System Malfunction...
p0732
P0732 OBD II Trouble Code Gear 2 Incorrect Ratio YourMechanic Advice
p0733
P0733 OBD II Trouble Code Gear 3 Incorrect Ratio YourMechanic Advice

Did you fix the over heating problem? No use going to the transmission until that is fixed. With those codes, you are probably in limp mode, 2nd gear. I would still drive it around the neighborhood a while to make sure the over heat problem is fixed. The only reason I say this is because it is a 2000. Not worth throwing away another $400 in transmission parts, if the engine has a blown head gasket.

P0700 transmission control system malfunction (failure)
P0732 gear 2 incorrect ratio
P0734 gear 4 incorrect ratio

Check level and conditions of fluid

p1784 shift up /down wire open,,,P0700 Transmission Control System Malfunction

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P0732 Gear 2 Incorrect ratio

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The P0700 means Transmission Control System (MIL Request)
and P1787 means 2-1 Downshift Error.
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FGTech Galletto 2-Master EOBD2

p1781 is manufacturer control transmission, p0731 is gear 1 ratio incorrect, p1784 is manufacturer control transmission, p0700 is trans, control system malfunction. all of these codes refer to tranny.This code normally points to a faulty transmission control module, but this is an expensive part and you should have an experienced Dodge technician diagnose the problem first. or a transmission specialist. the other codes are probably associated with the p0700 code. have a good day !

CODE P1775 - A / T OR AUTOMATIC TRANSMISSION SWITCH LATCHED IN TCC POSITION. CODE PO732 - A / T ADDITIONAL GEAR RATIO ERROR IN SECOND GEAR. CODE PO700 - AUTOMATIC TRANSMISSION CONTROL SYSTEM MALFUNCTION CODE PO456 - EVAP SYSTEM SMALL LEAK DETECTED.POSSIBLE CAUSE FUEL TANK CAP LOOSE OR DAMAGED , SMALL LEAK PRESENT SOMEWHERE IN EVAP SYSTEM. I DID NOT SEE CODE P1788. BUT CODES P1775, P0732 , PO700 , YOU HAVE INTERNAL TRANSMISSION PROBLEMS TRANSMISSION SHOP HAS TO HOOK DIAGNOSTIC EQUIPMENT TO CHECK TRANSMISSION PRESSURE SOLENOIDS AND SHIFT SOLENOIDS. TRANSMISSION VALVE BODY HAS MANY SOLENOIDS PRESSURE SWITCH AND SENSORS COST TOO MUCH REPLACE THEM ALL LET GARAGE SCANNED TRANSMISSION BE MUCH CHEAPER.

I replaced the speed sensor & this took care of the problem.

P0732 Gear 2 Incorrect ratio
P1782 P/ES Circuit Out Of Self Test Range
P1787 2-1 Downshift Error
P0700 Transmission Control System (MIL Request) Malfunction

Here is the deal, u have some serious transmission related faults, in order to sort this out u will need to take this to the dealer, allot of testing is required to get to the bottom of this, if I had to guess I would say the trans is going to have to be overhauled.