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Discussion Topic:
41 Merc. differential ratios.
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TomO |
01-04-2011 @ 7:17 AM
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The V-8 Album confirms that all 41 Mercury's had 6.50x16 tires.
Tom
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42merc |
01-03-2011 @ 4:56 PM
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I agree. I couldn't prove it, but it looks like you did.
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tbirdhandyman |
12-28-2010 @ 6:44 PM
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The standard ring gear & drive shaft with pinion was a matched set, 3.54 to 1 ratio in the '41 Mercuries. Optional diff. ratios for the '41 Mercury were: 3.78 to 1 (P/N 19A-4209-E) and 3.63 to 1 (P/N 19A-4209-G). The 4.11 to 1 (P/N 48-4209-D) was a '42 - '48 option. When a '41 was equiped with the 3.54 to 1 standard ratio, a smaller diameter (3.18") generator pully (P/N 01A-10130-B was supplied, due to the low rpm's of the engine. My '41 convertible has both the one piece driveshaft/pinion (3.54 to 1) and the small pully. All '41 Mercuries had 6:50X16 tires and used wheel (P/N 19A-1015), which was much heavier that the 11A-1015 used on '41 Fords. In '39 & '40 Mercuries, 6:00X16 tires were standard, and 6:50X16 tires were optional, but used the Ford wheels. The '41 Mercury "19-A" prefix breaks down as follows: 1 = Year - 1941 9 = Engine - 100 HP V-8 (Truck engine) A = Type of vehicle - passenger This data is from "Mercury Chasis Parts Catalogue- 1939 through 1948" Form # 3671-48, dated March, 1948 As someone said: "just because it is in the book, it still could be wrong" Comments, please! Robert E.
Tbirdhandyman
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42merc |
12-22-2010 @ 4:51 PM
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I guess I wasn't clear with my prior statement.1ga-4209 is a 41 Ford 6 cyl part# for a 3.63 gear set.41 Mercury's also had a 3.63 gear set but I don't have a Mercury parts book to verify a Mercury part#.
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supereal |
12-22-2010 @ 9:30 AM
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I'm unaware that Mercury ever put a six in their cars. If you find a 1GA rear in an V8 car, it is likely that the rear end was swapped at some time with a junk yard unit unless there is evidence it was actually used in the Mercs.
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42merc |
12-19-2010 @ 3:19 PM
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I can back up the 6 cyl 3.63 ratio with the green book, part # 1GA-4209. I don't have a Mercury parts book, but I have worked on the 3.63 ratio Merc rear ends in days gone by.
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42merc |
12-18-2010 @ 3:28 PM
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3;64 is a real 41 merc & 6 cyl ford ratio. If you were to open it up you would find a one piece driveshaft/pinion, no coupling, unique to these models.
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Stroker |
12-11-2010 @ 11:53 AM
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Sounds reasonable!
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TomO |
12-11-2010 @ 10:39 AM
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I can only guess why, but they may have thought that the 3.54 ratio was too high for the cars equipped with the 6.50 x 16 tires. The 239 engine was only rated at 95 HP in 1941, in 1942 and later it was rated at 100 HP.
Tom
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Stroker |
12-10-2010 @ 9:21 AM
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Tom O: That's really interesting! One of the benefits of this Forum is that for me, it has been quite a learning experience. I wonder what possessed the Mercury division to come up with a 3.63, and then only use it one year? At least they used an 11 tooth pinion, which should have made it a pretty durable assembly. More and more, we are seeing aftermarket asian gearsets that use fewer teeth as a cost compromise, given that hobbing spiral-bevel teeth is time con$uming. Thanks for the rare insight.
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