Ford 6R60/6R80 Erratic Temperature Operation - Transmission Digest

Ford 6R60/6R80 Erratic Temperature Operation

The Complaint

A 2013 Ford F-150 equipped with the 6R80 Transmission was overhauled and reinstalled back into the vehicle. On the initial road test, the “trans temp” lamp came on. The truck was equipped with a dash-mounted monitor which was set to engine RPM, vehicle speed, engine coolant temperature and transmission temperature. While driving, the technician could see erratic behavior of transmission temperature, in fact the rise and fall of the temperature reading was in cadence with vehicle speed; refer to figure 1 above.

The technician used an infrared temperature gun to read the transmission sump temperature which was 190ºF. This would indicate that the temperature sensor or circuit was malfunctioning. Checking the voltage on the temperature sensor signal wire unplugged indicated 4.9 volts, which equaled the temperature being displayed on the monitor.

What followed was an electrical system check, which resulted in no problems found that could be related to the transmission temperature being displayed on the monitor. At this time the PCM and the valve body with the lead frame were replaced, which did not fix the erratic temperature situation.

The Cause

The rebuild technician used .083” steel plates to stack the low/reverse clutch. This created a clutch pack that was too tight. As a result of this, the low reverse frictions were burning and creating a great deal of heat. The ATF temperature sensor is mounted on the lead frame as seen in figure 2. The temperature sensor is mounted directly below the low/reverse clutch pack as seen in the cutaway in figure 3.

Figure 2.
Figure 3.

The temperature sensor’s proximity to the overheated low/reverse clutch pack is what caused the transmission temperature to be so erratic.

The Correction

The low/reverse clutch pack was rebuilt using four .070” steel plates and one .083” steel plate which would result in a correct clutch clearance of .039” to .062”. After the transmission was reinstalled back into the vehicle, the road test results came back with normal transmission temperature readings and no other complaints.

You May Also Like

GM 6T70/75 slips and delays in first

A 2015 Chevrolet Equinox equipped with the 3.6-liter engine and 6T75 transmission has complaints of a delayed engagement into drive and slips in first gear.


The complaint

A 2015 Chevrolet Equinox equipped with the 3.6-liter engine and GM 6T75 transmission has complaints of a delayed engagement into drive and slips in first gear.

The cause

A generation one 1-2-3-4 Clutch Apply Piston was installed into a generation two transmission. The generation two 1-2-3-4 Clutch Apply Piston apply fingers are .147 in. taller than the generation one piston. This created too much clutch clearance for the clutch pack to effectively hold.

How to fix GM 6T70/Ford 6F50 rattling noise with transmission in gear

A rattling noise is coming from the transmission whenever the engine is running and the transmission is in gear.

Mercedes-Benz 722.9 no forward movement after overhaul

The complaint A 2007 Mercedes-Benz CLS550 with the 722.9 transmission has an after-overhaul complaint of no forward movement. Related Articles – 6R80 whirring noise: TCC slip or engine surge? – The torque converter can of worms: Lockup and aftermarket programming – The Subaru mystery burn The cause The B2 Brake Housing inner apply piston was

Land Rover LR3 ZF6HP26 no start after overhaul

The complaint A 2006 Land Rover LR3 equipped with the ZF6HP26 transmission has a post-overhaul complaint of a no-start condition. Part of the transmission overhaul process included the replacement of the mechatronic unit. Related Articles – Shift Pointers: Where’s that fluid leak coming from? – Multitasking: Sorting out multiple issues with the same vehicle –

Infiniti G37 RE7R01A chassis codes set

The complaint A 2013 Infiniti G37 equipped with the RE7R01A transmission and the EXT13C transfer case has a complaint of trouble codes C1204 “4WD Solenoid Malfunction” and C1105 “Right Rear Wheel Speed Sensor Fault” stored. Due to extensive damage, the transfer case was replaced, which did not eliminate the stored codes. The shop then replaced


Other Posts

Kitting keeps us profitable: Aftermarket kit suppliers listing 2024

The kitting of transmission parts has made profitable shop operation possible. When a kit with 100 parts is necessary, a distributor has already assembled all the important components into the kit and it is typically sitting on the shelf ready to be delivered. Kitting saves time and effort for both the shop and the supplying

Honda Accord BB7A six-speed: P2720 code set after collision

The complaint A 2015 Honda Accord with a 3.5-liter engine and the BB7A six-speed transmission (seen in figure 1, above), was involved in a minor collision to the left front of the vehicle. The vehicle was drivable and was taken to the transmission shop. Vehicle diagnostics revealed a P2720 “Pressure Control Solenoid D Voltage Low”

42RLE buzzing noise on initial engagement

The complaint A 2005 Jeep Wrangler equipped with the 42RLE transmission had a buzzing noise when the shift selector was moved to the drive position. The vehicle was actually brought in with a shift complaint, at which time the owner of the vehicle also said that the buzzing noise was present since he purchased the

62TE delayed forward engagement

The complaint A 2016 Dodge Journey with the 62TE transmission had a complaint of delayed forward engagement and fluid leaking out of the vent when the transmission is placed in drive only. A code P0740 “Torque Converter Clutch Malfunction” was set. Related Articles – Sometimes, a diagnostic code is all you need – 10L80 and