| 37coop | -- 02-19-2014 @ 12:50 PM |
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hi guys ,I,m at the back end of my 51 f1 restoration ,I imported it into the u.k a year ago and have never driven it ,I believe its fitted with a 427.1 back axle and has 15 inch wheels ,what sort of performance can I expect ,particularly cruising speed,will the 15 inch wheels make much difference? many thanks for your help ,jim.
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| supereal | -- 02-19-2014 @ 1:03 PM |
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Many of the light duty trucks carried a 4:44 axle gearing. A 4:55 was also made. The 4:44 would have a 9 tooth pinion and a 40 tooth ring gear. The 4:55 would have 9-41. As the driveshaft is accessable, I'd jack up the rear axle and count how many turns are required of the driveshaft to make the rear wheel go once. In any case, it is likely your truck will be slow on the road. Wheel and tire size does affect speed, but with that axle, not a whole lot.
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| 51f1 | -- 02-20-2014 @ 3:15 PM |
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The F-1 had a 3.73:1 or a 4.27:1 and 16" wheels. Although 15" wheels were optional, they were probably never sold. Fifteen inch wheels were added later in the life of the truck. I have the 3.73:1 with 16" wheels. (When I bought the truck, someone had installed 15" wheels.) You can comfortably drive the truck with the higher ratio and 16" wheels up to 60 mph or more, although it runs best at 50 mph or below. It will run at speeds above 70 mph, but you are taking a chance. The lower ratio will not be comfortable at those speeds. If I were you, I'd look for a rear axle with the higher ratio. I'd also look for 16" wheels. Richard
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| 37coop | -- 02-21-2014 @ 2:41 AM |
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thanks guys , I live in the u.k and both 16inch wheels and an alternative axle would be pretty hard to find ,I will keep my ears/eyes open but will probably have to live with what I,v got , thanks jim.
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| bonusbuilt1950 | -- 02-21-2014 @ 7:51 AM |
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According to the Salesman data book for 1951, there were 2 axle ratios, 3.92 to 1, or 4.27 to 1. Also, tire sizes were 6.00x16 std, with 6.50x16 optional . No 15 inch rims were listed as being on these trucks. Barry 50 F-1
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| 51f1 | -- 02-24-2014 @ 6:20 AM |
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If you look on page 361 of the factory shop manual, you will see 15" wheels, 15x5.50-F, part number 7RC-1015, listed for the F-1. As I said, they were probably never on a truck from the factory. Richard
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| ken ct. | -- 02-24-2014 @ 1:59 PM |
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A 4.27 RE will wind the engine pretty tight at 60 mph. 50 would be a more comfortable speed. 16" wheels would help only slightly and not worth the trouble,omo. ken ct usa
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| 37coop | -- 03-03-2014 @ 10:00 AM |
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thanks guys ...I guess I will settle for what it is ,if I can cruise at around 50 I think it would be adequate,i will be running the rebuilt engine in for a while so I will have to get used to a line of irate drivers behind me , thanks again , jim.
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