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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

351 trans

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Old Aug 20, 2020 | 07:38 PM
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351 trans

ok so my truck i just scored is a 70 f100 was told its a 302...
Hahah..its actually a 351 with small cam and race holly 4412 carb....she flexes the truck.so.hard...but here's my issue...it still has the t170 srod 4 speed trans...cant handle this setup

Please Point.me.in the right direction for a trans that can handle the motor...will also need info on drive shaft and rear-end..im assumimg.it can't handle it either
 
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Old Aug 20, 2020 | 07:42 PM
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Rear axle should be a 9", it will be ok but the ratio might not be what you want.

As to the transmission, a C6 would work, An AOD, a 4r70W....

Or a toploader 4 speed if you can find one, a T56 or other similar "newish" 5 speed.

Budget, manual or auto, OD or direct. Narrowing it down will help.
 
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Old Aug 20, 2020 | 08:35 PM
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Originally Posted by 85e150
Rear axle should be a 9", it will be ok but the ratio might not be what you want.

As to the transmission, a C6 would work, An AOD, a 4r70W....

Or a toploader 4 speed if you can find one, a T56 or other similar "newish" 5 speed.

Budget, manual or auto, OD or direct. Narrowing it down will help.
budget manual preferred
 
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Old Aug 20, 2020 | 11:12 PM
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If you are going to go cheap, go with a C6. They will take a lot more than the old manuals, and be easier on the rear axle. Get some traction bars to keep the axle from wrapping up. That will break things quickly--u-joints for one.

 
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Old Aug 21, 2020 | 11:47 AM
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AOD if you want to drive it long distance.

If you really want a manual, NP435 is nice. Or maybe a M5OD-R2.

The rear axle is a 9 inch. Well up to the task.
 
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Old Aug 21, 2020 | 12:10 PM
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Originally Posted by Curbside1
ok so my truck i just scored is a 70 f100 was told its a 302...
Hahah..its actually a 351 with small cam and race holly 4412 carb....she flexes the truck.so.hard...but here's my issue...it still has the t170 RUG SR-OD 4 speed trans ...cant handle this setup
RUG SR-OD introduced in 1978 F100/150 with 300/302, used thru 1983.

1965/72 F100/250 2WD would have the optional Warner T-18 4 speed without overdrive. Reverse is up-towards the dash.

No truck came with a 351M until 1977, no truck came with a 351W until 1981. 1970/74 351C was not installed in trucks.
 
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Old Aug 21, 2020 | 08:19 PM
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No truck came with a 351w until '81? I could have sworn they were in trucks through most of the 70's.
 
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Old Aug 21, 2020 | 10:24 PM
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Originally Posted by v84960
No truck came with a 351w until '81? I could have sworn they were in trucks through most of the 70's.
No 351 of any kind in a truck until '77. And that was only the 351M. But of course, that doesn't mean guys didn't swap them in.
 
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Old Aug 22, 2020 | 01:26 AM
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I guess you're right-everything I've looked at thinking you were wrong has proven you are in fact correct. I guess I've seen enough swapped in windsors to assume they were factory.
 
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Old Aug 22, 2020 | 02:57 AM
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Originally Posted by v84960
No truck came with a 351W until '81? I could have sworn they were in trucks through most of the 70's.
351W introduced in 1969 Ford/Merc Passenger Cars, in Econolines in 1975, in F150/350 & Bronco in 1981.

351M: 1975/79 Ford/Merc Passenger Cars; 1977/79 F100/350; 1978/82 Bronco; 1980/82 F150/350 & Econoline.

Largest available engine in 1980/83 F100: 302.
 
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Old Aug 22, 2020 | 07:10 AM
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If it is a Windsor 351 & not a 335 series engine it will have this diagonal casting at the base of the distributor.

If the casting is at a right angle, it's a 302.

You can feel it with your hand if you can't see it.


 
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Old Aug 22, 2020 | 11:36 AM
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Originally Posted by v84960
I guess you're right-everything I've looked at thinking you were wrong has proven you are in fact correct. I guess I've seen enough swapped in windsors to assume they were factory.
We don't gloat, but we know a thing or two around these parts.....

People's biggest problem seems to be taking offense to facts that aren't on their side. But facts are facts and don't care about feelings. Haha
 
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Old Aug 22, 2020 | 12:11 PM
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I would go with a ZF. They're behind plenty of 351s. They have an OD and a granny gear. You'll have to switch to a hydraulic clutch which means mounting the reservoir and engineering linkage to the clutch pedal
 
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