1973 - 1979 F-100 & Larger F-Series TrucksDiscuss the Dentsides Ford Truck
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I have a 1977 Ford F250 2WD and I have 4:11 rear end gears, I was thinking on going with 3:55, what are your thoughts on this folks? Is 3:55 a good choice, I want gears that are better for the highway.
Thanks for the information about the FMX Bill. I had read that FMX's were used in F350's but did not know the engine used. Yes, I can confirm that my tranny is an FMX since I obtained it from a passenger car. I obtained a big block bell housing for an FMX from the USA. Put a shift kit in and works like a dream.
I've got 3.50s in my F150 with a 460 and I think they are perfect. I don't feel the need for OD at all with 33 inch tires, but I do have the granny low and low Range if they are too high for something.
Also my dad has a 1979 full time auto F250 with a 429. It has 3.55s and are great with the automatic trans as well. I would go for it. The speedo shouldn't be that big of a problem. I know on 80s/90s Mustangs there is a chart to get the correct speedo gear so I would assume you could find something similar to obtain the correct speedo gear.
Ive never heard of an FMX in a truck, and I had no idea they were offered from the factory, interesting. Speaking of things along those lines. A C4 auto trans has a removable bellhousing. I have a bell housing to put a C4 behind a 460! Not something you see every day. I had a project that never got finished where I was stripping a 1981 Mustang to be as light as possible and I was gonna use a junkyard 460 with a C4 (lighter and uses less power than a C6) and see how fast I could go for extremely cheap. I still have every thing just never materialized, got too much else going on. My bell housing came from a car that would have had a 351m or 400. I don't think a C4 actually ever came behind a 460.
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. The speedo shouldn't be that big of a problem. I know on 80s/90s Mustangs there is a chart to get the correct speedo gear so I would assume you could find something similar to obtain the correct speedo gear.
I don't think a C4 actually ever came behind a 460.
The plastic speedometer DRIVEN gears (at the end of the cable) are the same from 1960 thru today for cars & trucks, so are available from Ford.
The prices range from $2.00 to $3.76...each.
16-17-18-19-20 & 21 tooth gears are offered.
No C4's were used with 400, 429/460 or FE engines.
Some 1975/79 passenger cars with 351M's used the C4.
Other Passenger Car / F100/350 / Bronco / Econoline engines with C4's: 2.3L I-4 // 200/240/250/300 I-6's // 3.8L V6 // 255/260/289/302/351C 2V/351W.
Bill / Retired Ford Parts Manager / Part number research: 1928/2001 trucks & 1928/89 passenger cars.
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