Ford FNR5 slipping or no reverse hot - Transmission Digest

Main Navigation

Advertisement
Social Connect
Resources
Our Brand Family
Transmission Digest
Helping transmission shops achieve successful and profitable operation.
Technical

Ford FNR5 slipping or no reverse hot

Wayne Colonna
By Wayne Colonna
January-Tech-Talk-Figure-1-1400

The complaint

A Ford vehicle equipped with the FNR5 transmission has a complaint of a severe slipping condition in reverse. As the transmission approaches normal operating temperature, reverse movement is non-existent.

Related Articles

The cause

The case is cracked behind the low reverse clutch apply piston in an obscure area. The crack can be very difficult to see if it doesn’t spread (see Figure 1, above).

The correction

It’s simple: Replace the transmission case.

Read more articles in our Transmission Tech/Talk series here.

You May Also Like

Shift-Pointers-May-Figure-1-1400
Featured

Chrysler ZF8 generations 1 and 2 identification guide

In 2019, some Chrysler/Ram/Jeep applications that utilize the ZF8HP transmission moved to a second-generation unit with a new designation and numerous changes for better performance and durability. Gen. 1 units are classified as 8HP45, 8HP70 and 8HP90; while Gen. 2 are classified as 8HP50, 8HP75 and 8HP95. Internally, the Gen. 2 transmission had numerous hard

Jim Dial
By Jim Dial
Tasc-Tip-April-Figure-1-Gen.-1-'B'-Brake-Components-1400

In 2019, some Chrysler/Ram/Jeep applications that utilize the ZF8HP transmission moved to a second-generation unit with a new designation and numerous changes for better performance and durability. Gen. 1 units are classified as 8HP45, 8HP70 and 8HP90; while Gen. 2 are classified as 8HP50, 8HP75 and 8HP95. Internally, the Gen. 2 transmission had numerous hard part changes due to a change in gear ratios. Controls also went through numerous changes, as one of the clutch/brake-related circuits was eliminated.

Read Full Article

More Technical Posts
When a transmission problem isn’t a transmission problem

Let’s take a look at three examples of times when a car’s issue seems to be a transmission problem, but a closer look reveals another culprit. Related Articles – A mysterious shudder: Locating a problem with no fault codes – Photo gallery: TCRA Annual Meeting 2023 – California’s Rohnert Park Transmissions is a multi-generational success

By Bill Harris
Shift-Pointers-April-Figure-3-1400
Breaking parts: Pressure regulator valve and bore blues

One of our ATSG members, Bob at Trans Tek, recently shared with us an experience he encountered with a 2011 GMC 3500 Mini School Bus with a Duramax diesel engine in front of a 6L90 transmission. It came in to the shop slipping, along with having no second or sixth gear. After the transmission was

By Wayne Colonna
Tech-Speak-April-Figure-1-1400
Transmission fluid hydraulics

To understand why using the correct transmission fluid is necessary, you first have to know how the transmission fluid flows inside an automatic transmission. Related Articles – TCM trouble and the importance of being certain about parts replacement – GM 6L series no-movement conditions: Analysis and repair tips – 2023 State of the Powertrain Industry

By Andrew Markel
Transmission-Fluid-Hydraulics-and-Shifting
TCM trouble and the importance of being certain about parts replacement

It’s a tale as old as time. A vehicle comes in and, despite having been recently repaired by another shop, the vehicle owner’s concern is still present. In the case of this story, the vehicle came from a local shop we work closely with. The truck in question is a 66,000-mile 2006 Chevrolet Silverado 2500

By Sean Mahoney
RR-Tech-March-FIG-1-1400

Other Posts

Critical wear areas and vacuum test locations: GM 10L and Ford 10R series

Sonnax has provided the following guide on critical wear areas and vacuum test locations for the GM 10L series and the Ford 10R series. Technicans working on these models should find the following four pages helpful. Related Articles – The evolution of transmissions – Scope testing the Ford 10R80 – Announcing the winners of the

By Sonnax
02feb23_TASC-feature-1400
Scope testing the Ford 10R80

Recently, we at Certified Transmission had a chance to do some work with the Ford 10R80. We have easy access to test vehicles since our owner also owns a used car dealership. For our R&D testing we used a 2019 F-150 equipped with a 5.0L engine and the 10R80 transmission. I got to play around

By Chris Adams
RRfeature1400
Shift pointers: A 4T65-E that wants to move in Park and Neutral

When conducting ATSG seminars, as we are usually covering a specific piece of tech, we’ll often tell attendees that if they put this together wrong, they should let us know what happens. Just recently, Ricky Hodgkinson from AACTION Transmission did just that. He was kind enough to share an incident he recently had with a

By Wayne Colonna
ebulletin-feb-feature-1400
Being tuned in: The value of transmission tuning

Tuning a vehicle to optimize its performance is nothing new. This customized process is used to provide fuel efficiency and improve other driveability concerns. Tuning for torque is especially desirable by diesel owners.Those who are proficient at tuning know that the transmission will need serious upgrades to survive the increased force it will receive from

By Wayne Colonna
Tech-Speak-Feb-Figure-1-1400