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Ford FNR5 slipping or no reverse hot

Wayne Colonna
By Wayne Colonna
Published:
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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Figure 1.
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Ford 8F35 maintenance tips: Planetary failure and no-pressure conditions

Our shop has had several vehicles come in with the Ford 8F35 transmission having planetary failure. Apparently, there was a run where the pinion needle bearings had a hardness problem (see Figure 1). Ford has a bulletin out (bulletin number 22-281), which provides a part number for this planetary assembly: the part number is JM5Z-7N473-C and

Craig Sarokoff
By Craig Sarokoff
Published:
Figure 12.

Our shop has had several vehicles come in with the Ford 8F35 transmission having planetary failure. Apparently, there was a run where the pinion needle bearings had a hardness problem (see Figure 1).

Ford has a bulletin out (bulletin number 22-281), which provides a part number for this planetary assembly: the part number is JM5Z-7N473-C and costs about $160.

Read Full Article

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