Ford did diagnostic. Got error codes: p0733 & p0745. They're saying to replace or rebuild transmission. Said the fluid was dirty & had metal in it. Do you think it needs replacing?

If your 1993 Ford Explorer XLT is not engaging in reverse, but will roll backwards if pushed in neutral, there are a few things that could be causing the issue:

1. Transmission fluid: Check the transmission fluid level and condition. Low or dirty transmission fluid can cause issues with shifting and engagement.
2. Transmission linkage: The linkage that connects the transmission shifter to the transmission may be damaged or misaligned. Check the linkage for any signs of damage or misalignment.
3. Transmission solenoid: The transmission solenoid that controls the engagement of reverse gear may be malfunctioning. A diagnostic scan tool can be used to check for any error codes related to the solenoid.
4. Internal transmission issues: It's possible that there is an internal issue with the transmission, such as a damaged gear or worn clutch. A transmission rebuild or replacement may be necessary in this case.

It's best to have a professional mechanic diagnose and repair the issue, as transmission repairs can be complex and require specialized knowledge and equipment. They can properly diagnose the issue and recommend the best course of action to get your vehicle back in working order.

Yes, this could be the shift solenoid. Was the transmission filter changed at the same time as the fluid? Dirt in the system can affect some of the transmission sensors tripping Trouble codes. I cannot be sure what the P1732 code is as some codes can be very vehicle specific but it appears to refer to the transmission or on of it's sensors.

P0733 - Gear 3 Incorrect Ratio.
P0734 - Gear 4 Incorrect Ratio.

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

Code P0734 more or less means transmission is slipping in 4th.

• Defective 4th gear related shift solenoid
• Defective 4th gear related gear set or clutch pack
• Defective Engine Coolant Temperature Sensor
• Defective Valve Body
• Dirty transmission fluid that restricts the hydraulic passages

Check the attached links,
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P0734 OBD II Trouble Code

http://www.datsc.com/tabid/122/OBD-Error-Code/P0734/Diagnostics/chrysler/Default.aspx
P0731 Gear 1 Incorrect Ratio
Transmission code P0733 without P0715

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0700 is simply the ecm recognising that the tcm (tranny) has an error code stored/registered. The one to worry about is your p0733 code. This code means the tcm detected a gear ratio error in third gear. There's 5 main possible causes. Simple/cheap -> expensive/difficult. .. Low or dirty ATF. Add fluid if low or change fluid and filter If burnt smelling or dirty/discolored. Shifting solenoid . Check or have tested the shifting solenoids . They control fluid flow and transfer to various clutch packs for gears. Hydraulic control circuit and mechanical failure. Both of these require full rebuild. Control circuit is expensive and hard to get to . Mechanicalso is usually either a worn out/pourly adjusted clutch pack causing the gear to slip or a failing torque converter.

There is no one fix works for all on these code. Also you have left out the letter and one number of the code I assume these are P0730 and P0733, if so read on.

P0730 CHRYSLER - Incorrect Gear RatioPossible causes- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Shift solenoids harness or connectors
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0733 CHRYSLER - Gear Ratio Error In Third GearPossible causes- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

Its you TCM---(Transmission Control Module)

P0732 FORD - Incorrect Second Gear Ratio
Transmission in second gear and the ECM detected an incorrect gear ration. This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (2nd) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

Tech notes
Start by inspecting the transmission fluid level and condition, and change fluid if necessary.


Hope helps.

your transmission is worn out and has been overheated too many times you need to rebuild the transmission or get a new one