1973 - 1979 F-100 & Larger F-Series TrucksDiscuss the Dentsides Ford Truck
Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.
You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!
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.
1999 Ford F-250 4X4 V10 ZF5-speed Dana 60 Front
1979 Ford Bronco 4X4 400 NP205 C6
1979 Ford F-150 4X4 400 NP205 4-speed Parts?
1977 Ford F-150 4X4 460 NP205 4-speed
1977 Ford F-150 4X4 400 NP205 C6 Parts?
1976 Ford F-250 4X4 390 NP205 C6
. 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 / SoCal Chapter Member / Part number research: 1928/2001 trucks & 1928/89 passenger cars.
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.