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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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Old Apr 16, 2016 | 06:29 PM
  #1  
Nathan Cox's Avatar
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Shift Speeds

Hey guys got a couple questions. 1984 F250 6.9 bored to 7.3 4x4 4spd reverse over and down. Don't have a tach in it.

First question . Yes I've drove a manual before. What speeds do I shift for best fuel economy?

Axle code is a ...P what gear ratio would be best for that. 3.73?

And how fast should i run in 4x4 high and lo.?
 
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Old Apr 17, 2016 | 06:57 AM
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What speeds do I shift for best fuel economy?
As quickly as you can without stalling the engine.

Axle code is a ...P what gear ratio would be best for that. 3.73?
There is no axle code P, that is a transmission code for a t19 4 speed

And how fast should i run in 4x4 high and lo.?
As fast as you would like, the engine is governed to 3300 rpm.
 
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Old Apr 17, 2016 | 08:08 AM
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You can decode your certification label here and figure out the axle ratio: Certification Label - Gary's Garagemahal
 
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