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Old 03-18-2008, 09:45 AM
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51 Ford Pick Up

I have a chance to buy a 51 ford pick up,it is all original.
I know that they dont go that fast or get great gas
mileage.I have a 302 & c4 trans that i MIGHT put
in it.{not sure yet} What would be the best rear to
put in it ? Like i said i might leave the flathead in
it.How much trouble would it be to hook the c4
or an A O D to the flathead? I never did this before
so please excuse all the questions & thanks for
any & all the info. BOB

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Old 03-18-2008, 10:31 AM
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Quote:
Originally Posted by mercury man
I have a chance to buy a 51 ford pick up,it is all original.
I know that they dont go that fast or get great gas
mileage.I have a 302 & c4 trans that i MIGHT put
in it.{not sure yet} What would be the best rear to
put in it ?
A 57 to mid 60's F-100 in almost a direct bolt in. You could even use the original rims. Then most any 9 inch Ford center section ( with gear ratios available from 2.50 to 6.00 ) would bolt in it.

Quote:
Originally Posted by mercury man
Like i said i might leave the flathead in
it.How much trouble would it be to hook the c4
or an A O D to the flathead?
There are kits available to bolt a later Ford automatic to the Flathead. ( C-4 type ) ... maybe the A O D would also work. Maybe someone else would know about that ...
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Old 03-21-2008, 07:18 PM
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DUCE ! If i put one of those 57-60 rears in my
51 ford pick up & i put the 302 & a c4 or A O D
in it what would be the best gear ratio to put in?
I do not want to tear up the road i just want a
nice cruiser & some gas mileage.

I also have a 97 Ford Ranger 4 cyl auto
when i am doing 45 my tach says 2000
when i am doing 50 my tach says 2500
my wifes 4.7 jeep auto/ with quadro drive
at 50 the tach says 1500.

Wha can you tell me? Thanks.
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Old 03-21-2008, 09:09 PM
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The AOD has a overdrive ... so you can run a lower ratio than if you just run the C-4. Most rodders want to end up around 3.00 to 3.40 final drive with a C-4 and maybe 2.50 to 2.70 final drive in OD with the AOD. That is using a 15 inch rim with a tire that measures 28 to 30 inches tall.

I have a 32 Ford with a SBC ... and I run a 3.50 or 3.70 rear gear with my OD transmission.

If you plan on towing ... you may want to go a little lower in your gear selection.
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Old 03-22-2008, 03:44 PM
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The factory manual lists the rears as 3.92 or 4.27. The original ratios are a bit deep without an overdrive. I ran my 49 F-1 with a 56 Buick nailhead thru an original trans and rear. Mine was a 3.92 and was marginally acceptable up to about 65 mph with 30" tall truck tires. You will be ok if you run an AOD. I am setting my 49 up with an AOD but still changed out to a 3.70 9" rear and I plan to tow.
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