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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.

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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.

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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.

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By Wayne Colonna
Tech-Talk-Q4-Figure-11-1400

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.

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