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Old Mar 17, 2010 | 11:42 PM
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81 3 speed auto

I am lookin into an 81 F150, it has a 300 c.i. and a three speed auto (c4 or c6, idk yet). I wanna know how this trucks trans. will hold up, and what kinda milage its gunna get.
I think that it has 2.25 gears, but thats just a guess.
 
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Old Mar 19, 2010 | 12:09 AM
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C4, C5 or C6. Id here, also found up top under "articles/specs"

Ford Transmission Spotter's Guide .: Articles
 
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Old Mar 20, 2010 | 01:20 PM
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Originally Posted by 85e150six4mtod
C4, C5 or C6. Id here, also found up top under "articles/specs"

Ford Transmission Spotter's Guide .: Articles

it appears to have a c6.
 
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Old Mar 20, 2010 | 02:21 PM
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The C6 is a tough old trans. With a 300, C6 and 2.75 gears, I can get 16-18 MPG on the highway. It isn't fast by any means, but it does have decent pickup when accelerating.
I haven't seen any 2.25 gears used behind a 300 C6 combo, but that doesn't mean it never existed. Most have 2.47, 2.75, or 3.00 gears in 81. 3.25 and 3.50 are possibilities, but no where near as common.
 
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Old Mar 20, 2010 | 05:30 PM
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i was just guessing at the gears.
So... this should be a pretty sound truck??
 
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Old Mar 20, 2010 | 05:33 PM
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If you have a 9" rear axle, the 300/c6/9" are three of the strongest components ever fielded by Ford.

I can't recall the variants on your vintage truck. Do you have 5 on 5.5 bolt pattern wheels?
 
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Old Mar 20, 2010 | 05:35 PM
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yep, 15" w/ 5 on 5.5.

What i sthe towing max on this setup? I could pull 8000 on my k1500, and want to use this truck to pull the same trailer.
 
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Old Mar 20, 2010 | 05:53 PM
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Not sure of the factory spec, but that seems like a lot given the 300 and the gear you are running. You'll move it, but not too fast or quick... and you'll be in second a lot with any hill action.

And don't forget trailer brakes....

Someone may have better info on the specs or direct experience with that combo....
 
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Old Mar 20, 2010 | 05:58 PM
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Originally Posted by 85e150six4mtod
Not sure of the factory spec, but that seems like a lot given the 300 and the gear you are running. You'll move it, but not too fast or quick... and you'll be in second a lot with any hill action.

And don't forget trailer brakes....

Someone may have better info on the specs or direct experience with that combo....

its just around town, 2 hills max and 25-35 mph. should handle it with trailer brakes.
 
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Old Mar 20, 2010 | 06:11 PM
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For that duty, you're all set.

Good luck with it.
 
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Old Mar 20, 2010 | 07:27 PM
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thanks for the help.
I will finally get the truck tuesday at 1800 hours. (ill get pics in then)
 
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