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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 02-21-2011   #1 (permalink)
69cobraman is offline Rookie


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Default C4 Transmission Slipping Out Of Park

I have a 70 Convertible with a 302 and C4 transmission. When placed in park, the car often slips out of park and rolls backwards. Obviously this is dangerous.

On another note, more often than not, the gear shifter needs to be manually pushed into park prior to the ignition key responding.

I'm not certain if both of these issues are related.

Any solution(s) are appreciated.

Cheers,
Rik
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Unread 02-21-2011   #2 (permalink)
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Default

Change out the bushings in the shift selector. Plastic bushings and often break. Not hard to replace. Should solve both your problems or at least the slipping out of park.
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Unread 02-21-2011   #3 (permalink)
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Default

Very common problem. My '65 coupe does the same thing. Changing the bushings like LED suggests may help...also try adjusting the parking pawl (the little lever connected to the shift button that leans against the jagged stop in the shifter assembly. If the pawl isn't properly seated / adjusted, the chances of slipping out of gear are greater.

However, even when these cars were new, Ford knew of this problem and advised owners not to leave the car running without their foot on the brakes. Remember, this was before the era of huge product liability lawsuits...
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Unread 02-22-2011   #4 (permalink)
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The linkage should be adjusted, the quadrant at the shifter should be replaced and all the bushings replaced.
When adjusting the shifter linkage do it in Drive with the shifter held back toward the "1" position lightly. (still in Drive)
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Unread 02-22-2011   #5 (permalink)
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Default quadrant

Paul S (and others), thanks for the Reply.

What exactly is the "quadrant"? Is this a part that I can order from a Mustang Distributor? Sorry for the ignorance.

Cheers,
Rik
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Unread 02-22-2011   #6 (permalink)
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Default Does this Kit appear correct?

For all you guys who know about the bushing replacement(s), does this kit look correct?

TCI 513700 Ford C4 Transmission Bushing Kit 9Pcs

Rik
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Unread 02-22-2011   #7 (permalink)
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You need the linkage bushings - not the transmission bushings.
The quadrant is a metal piece that the lever uses as a stop for each gear. It is why you have to lift the arm (column shift) or push the button (floor shift) to move the lever. the quadrant wears and no longer holds the shift lever in place.
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