having shift problems
having shift problems
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
F100: The rear axle is a 9 inch, but (1968/72), there were two different types available.
F250: The rear axle is a Dana 60.
F350: The rear axle is a Dana 70.
Camper Special or not makes no difference.
If you want to know the ratio, post the AXLE code found on the Warranty Plate, which is located on the left door face below the latch.
Ditto to discover which 9" it has...if an F100.
C6's have a vacuum modulator valve. It threads into the right (passenger) side-towards the rear of the transmission case.
Usually what happens is the short rubber vacuum hose that attaches to it...age cracks, then splits open.
When the modulator valve is removed, it has a short shift rod inside it that will just fall out if you aren't careful.
If that shift rod is missing, the trans won't shift.
The modulator valve could be defective.
Mountain Pass
Joined: Jan 2010
Posts: 172
Likes: 3
From: Australia
I was hoping you could tell me the ratio of Dana 60 an 70 also ratio of 4speed ZL no OD its all powered by 300 Canadian very low ratio 1''2''3''4 engine is running more like screaming at about 70 miles an hour should it be screaming on that speedo 100 is about 80 miles can you tell me how to fix it so highway speeds a reving the **** out of the 300 or do you think 5 speed is the answer 
Last edited by myutesux; Jun 7, 2010 at 11:29 AM. Reason: misspelling
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