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Discussion Topic:
1951 Rearend Ratio
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caretaker |
02-03-2010 @ 5:22 PM
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New Member
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Joined: Oct 2009
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I have a 1951 V-8 with a H.D. 3 speed floor shift. Can anyone advise what would be the standard differential ratio on this truck. I was told that mine is a farm truck because the bed width is wider than a standard struck.
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trjford8 |
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02-03-2010 @ 8:41 PM
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New Member
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The standard ratio was 3.92. I'm sure you could also order a lower ratio (4.27)if needed.
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51f1 |
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02-04-2010 @ 4:16 AM
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New Member
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As trjford8 states, the standard ratio was 3.92 and the optional ratio was 4.27. This applies to the F-1 pick-up only. You didn't say yours was an F-1. The 3-speed HD floor shift transmission was an option on the F-1 through the F-5. The Larger capacity trucks had different rear-end ratios. For example, the F-2 and F-3 had 4.11 and 4.857 ratios.
I have never heard of a wider bed called a farm bed. It's not in any of the sales literature or books that I have. The F-1 bed is about 4 feet wide (to accomodate a sheet of plywood).
Richard
This message was edited by 51f1 on 2-4-10 @ 4:21 AM
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37RAGTOPMAN |
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02-05-2010 @ 7:51 AM
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hi caretaker
I have a complete,drum to drum rear out of a M1 52 MERCURY PICK-UP [ same as 51 52 FORD F1,] had a 3 speed on the column,I do not know what ratio it is but more of a highway rear than what you have,
IF INTERESTED let me know,located in MAINE, but
I go to HERSEHY PA in the FALL AACA meet,if this helps
37RAGTOPMAN bythebaymaine@myfairpoint.net
this MERCURY was converted to a modern drive train by a different person,and was a complete truck,also have the frontend with springs and drums,
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supereal |
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02-05-2010 @ 8:37 AM
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In most cases, changing the rear end ratio is accomplished by swapping the entire rear axle assembly with a junkyard unit when the driveline is the open type. Since few restored trucks actually haul anything but the driver, a lower ratio allows you to run at hiway speeds, instead of the usual fifty and under, with little loss of low speed power.
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51f1 |
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02-19-2010 @ 12:42 PM
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I think Supereal meant a higher ratio (numerically lower). A lower ratio would result in a lower highway speed (mph).
Richard
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supereal |
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02-19-2010 @ 2:21 PM
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New Member
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A low ratio would be 1-1, a higher ratio would be 1-2, etc, low referring to the result of dividing the number of teeth on the ring gear by those on the pinion. Thus a high ratio, 9-37, results in a gearing of 4-12 to 1, while a low ratio, such as 11-39, produces 3-55. I think the confusion results from the usual "high gearing" to "low gearing" useage, rather than the numerical ratio. A 3-55 gearing results in more turns of the axle per drive shaft revolution, and higher speed before you run out of revs.
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37RAGTOPMAN |
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03-03-2010 @ 6:55 AM
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New Member
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HI Caretaker
Higher ratio [411-1] lower speed more power for steep hills and pulling loads
lower ratio [ 354-1 ] higher speed on highways and less power on steep hills and you have to use lower gear in trans for steep hills,
this is the way I understand it,
I put a 354-1 in my 37 Cabriolet, and goes faster on the road, gets better gas miliage,and I really do not see any or much difference on hills, using the 85 hp engine,
my 3 cents worth 37RAGTOPMAN
IF YOU have a 4 speed with a granny gear you will have sort of the best of both worlds.if you had a high speed rear,low ratio 355 378 and like
If you plan on carrying loads or pulling a trailer go with a 378 or so
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supereal |
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03-03-2010 @ 2:19 PM
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New Member
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Most of the four speed transmissions were non-synchro, and offer few advantages, unless you plan to do some stump pulling. The ideal combination is a 3-78 rear with a 30% add-on overdrive, such as the Mitch*ll. It allows you to run a hiway speeds, yet retain plenty of power for traffic driving. I don't shift into OD much below 40-45, but I can run 65-70 when needed to keep up with traffic and not have some jerk trying to push me.
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37RAGTOPMAN |
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03-04-2010 @ 5:08 AM
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New Member
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yes that is the ideal combo,
IF you have the $2,000-$3,000 for the MITCH OVERDRIVE UNIT,
I thought that the only gear in a 4 speed that was not a snycro was 1st, but that 1st does come in handy
if you have a use for it,and it depends how much you drive the car or truck to go the extra $,for many different upgrades,
I never had a problem shifting them,
and then there are the 5 and 6 speed trans out there that could be installed as well
just my 3 cents worth,37RAGTOPMAN
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