72 tranny question
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72 tranny question
I recently purchased a 72 f100 4x4. It has a 390 with c6 tranny, so I am told. What tranny can I use to convert to an automatic that would bolt up with little trouble? I am also installing disc brakes and power steering.
Post Fiend
Joined: Apr 2008
Posts: 5,338
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From: Grants Pass, Oregon
Are you planning on retaining the single speed transfer case,or are you going to upgrade to a 2 speed Dana 20 or Np205?
Unlike the F250's which had a separated tranny/trans case,the 4 spd F100's had there single speed Dana 21 mounted directly......if yours is still stock configuration,there may be more to this install than you realize.....
Unlike the F250's which had a separated tranny/trans case,the 4 spd F100's had there single speed Dana 21 mounted directly......if yours is still stock configuration,there may be more to this install than you realize.....
Post Fiend
Joined: Apr 2008
Posts: 5,338
Likes: 3
From: Grants Pass, Oregon
Im not sure if an Auto will bolt up to your single speed transfer case or not?
it will be a lot longer than the 4 spd was,so you will need a longer front driveshaft and a shorter rear one.....you are also going to lose a lot of low speed crawl ability,as both 1st and reverse are about 6.5 to 1,compared to 1st and reverse in an automatic of around 2.5 to 1. If you drive a clutch well,nothings wrong with ride quality in a manual tranny.
it will be a lot longer than the 4 spd was,so you will need a longer front driveshaft and a shorter rear one.....you are also going to lose a lot of low speed crawl ability,as both 1st and reverse are about 6.5 to 1,compared to 1st and reverse in an automatic of around 2.5 to 1. If you drive a clutch well,nothings wrong with ride quality in a manual tranny.
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Post Fiend
Joined: Apr 2008
Posts: 5,338
Likes: 3
From: Grants Pass, Oregon
If i recall correctly,Ford never offered the Automatic with the single speed tranny,if you ordered an f100 from that era with an auto( i dont think many did?) you got a 2 spd transfer case..... i also believe that they didnt offer any f100/f250 4x4's with automatics until the body style change in 1973.....
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