An automatic handles torque a lot better, therefore, there are
fewer stresses on the engine, driveshaft, motor mounts, third
member, and rear axles. In addition, the clutches last longer in
an automatic than in a manual transmission. Having said that,
you still must choose the right transmission to match your
engine. If you are using a small-block Ford with a lot of
horsepower, bolt on a C4 transmission. If you are running a
big-block, a C6 is the way to go. If you are traveling on the
freeway, cruising at higher speeds, and do not have a real
strong engine, the Ford AOD is the answer. It is the only
transmission with overdrive capabilities. The C4 and C6 are
three-speed transmissions. The disadvantage to not having an
overdrive is that the cruising speed will be at a higher engine
rpm. Instead of running down the highway at 2,100 rpm, it may
take 2,800 rpm to maintain the same speed without an overdrive
transmission. The C4 is a strong transmission that will handle
up to 500 hp. Anything higher will be handled better by the C6.
The AOD will not take much more than 400 horses unless upgraded.
There are a few companies that do this now.
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B & M Racing and Performance
Products
9142 Independence Ave., Dept. KC
Chatsworth, CA 91311
(818) 882-6422
www.bmracing.com
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California Performance
Transmission (CPT)
5502 Engineer Dr., Dept. KC
Huntington Beach, CA 92649
(714) 901-3777
www.cpttransmission.com
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National Drivetrain
3631 S. Halsted St., Dept. KC
Chicago, IL 60609
(800) 507-4327
www.nationaldrivetrain.com
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TCI Automotive
151 Industrial Dr., Dept. KC
Ashland, MS 38603
(662) 224-8972
www.tciauto.com
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Matching the rearend gears with the transmission gearing
is important for off-the-line acceleration and setting
highway cruising speeds.
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Information is for reference
only. Engine Factory makes no claims to this articles
facts and we're not experts in the field of Transmissions
Back to C4 and C6 info
FORD ENGINES
1-800-704-5385
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