Wayne Colonna, Author at Transmission Digest
Ford harsh downshifts: 6R75 2-1, 10R60 7-6

Complaints, causes and corrections for two different Ford transmissions experiencing harsh downshifts.

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Ford 6R140 no engagement cold

The complaint A 2015 Ford F-250 equipped with the 6R140W transmission has just been overhauled. Shortly afterward, the transmission has begun to develop forward and reverse engagement problems when the unit is cold. As it warms up towards operating temperature, the engagement problems diminish and do not return until the next cooldown period. Trouble codes

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Ford 4R70W solenoid codes set

The complaint During the overhaul process of a Ford 4R70W transmission, it was necessary to replace the hard wire frame and case connector. After repairs were completed and the technician prepared to take the vehicle for a road test, the transmission took off in a higher gear and the MIL illuminated. The PCM was scanned

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Dealing with PCM fault codes on the Ford 5R110W

The complaint A 2005 Ford F350 with the 6.0 liter diesel engine and 5R110W transmission has set a P0753 “Pressure Control Solenoid A – Electrical Fault” code and a P2700 “Transmission Friction Element A – Apply Time Out Of Range” code. After a prolonged drive time, DTC P0752 “Pressure Control Solenoid A – Stuck On”

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Ford FNR5 slipping or no reverse hot

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. The cause The case is cracked behind the low reverse clutch apply piston in an obscure area. The crack can be very difficult to

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How to service the Honda 10-speed transmission

With Honda’s 10-speed front wheel drive transmission (see Figure 1, above) going into its fifth year on the roads, it’s feasible that one may show up in your shop for service. (One note: this transmission does not have a typical name; it’s simply known as “the Honda 10-speed automatic transmission” in all OEM materials.) One

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Shift Pointers: Reassembling GM pumps with cam failure

For the past several years, GM has used a binary positive displacement vane type pump. The compact design allows for it to be utilized in off-axis applications such as the 8L90 transmission and the third generation 6T40 transmission. Figures 1 (above) through 4 display a view of this style pump in the 6T40 applications. The

Searching for the source of an unexpected transmission fluid leak

As the installer was pumping fluid into the transmission from the right side of the vehicle, he was having a difficult time getting it full.

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Transmission slipping in fifth gear: An elusive cause of a common problem

Sometimes, finding the cause of a complaint isn’t as straightforward as one would expect; sometimes, these causes can be very elusive.

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The GM 8L90 Stop/Start or Go/No-Go

The Stop/Start feature many vehicles are equipped with today is in my opinion one of the most annoying features a vehicle could ever have. Of course, my opinion doesn’t reflect the opinion of others, but what is undeniably annoying is when the stop/start feature is not working correctly, especially when it is self-inflicted. Take, for

FCA 62TE missing caged needle bearing

The complaint When the Low Clutch Housing is removed from the Underdrive Center Shaft of a 62TE transmission, one notices that the caged needle bearing located on the shaft between the sealing rings was missing (Figure 1, above).  The cause A running change was made in 2010 where this caged needle bearing was eliminated. When

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FCA 62TE slipping in second and fifth

The complaint Immediately after overhaul, a 2013 Chrysler Town and Country with a 3.6L engine and a 62TE transmission faults to limp mode. The scan tool reveals trouble codes P0732 “Second Gear Ratio Error,” P0735 “Fifth Gear Ratio Error,” P0792 “Compounder Speed Error,” and P1790 “Fault After Shift” are set. During the overhaul procedure, the

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