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1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

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Old Jul 7, 2008 | 05:08 PM
  #1  
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From: Alabama
Bellhousing

Will the bellhousing on a 3-speed bolt to a 4-speed?
 
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Old Jul 7, 2008 | 05:23 PM
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what year/model/engine/trans? more info
 
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Old Jul 7, 2008 | 05:47 PM
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Bellhousing from 66 f-100 3-speed
 
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Old Jul 7, 2008 | 09:33 PM
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Yes, I've done it 3 ways in my 66 f-250, original it had 352 with NP425 4 speed, then I got rid of the 352 and put a 240 I-6 to the 4 speed ( the 240 had a 3 speed behind it originaly) , and now I'm just finishing up installing 4 speed with OD in the truck, this trans came out of a 1986 f-150 with a 300 I-6 this last install involved a mod to drive shaft length and drill to holes for center bearing mount for 2 piece driveshaft.
 
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Old Jul 8, 2008 | 07:15 AM
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Thank You for your response. What kind of fuel mileage do you get with the 6cyl 4-speed combo? Is your ratio 4.10?
 
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Old Jul 8, 2008 | 09:36 AM
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With 4 speed NP435 and 6 cyl, about 14 local and hiway mix, and I have a carb problem. I'm just doing the 1230 swap and no info yet. getting driveshaft back today. Yes my ratio is 4.10 and I've gone up 2 tire sizes from stock 650-16 to 750-R16
 
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Old Jul 8, 2008 | 09:58 AM
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A nice swap for a Mid 80s TOD will drop right in with some drive shaft and floor mods.

That is fords 3 speed overdrive. A four speed alumimum case unit top shifted with fourth gear as an .67 OD. You can usuall pick these up at a pick a part for 50 bucks.

Garbz
 
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Old Jul 8, 2008 | 10:14 AM
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Garbz, thanks for the info on OD ratio, didn't know it. All you describe is correct on swap that i'm finishing up. Trans going in appears to be a TF 170 (code RTS) as per a tranny guide in another thread
 
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