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I'm no expert but I think some guys run a Gear Vendor overdrive. These trucks came with either a T18 or a NP435 (as far as I know) so I think it would be easiest to swap one of those in with the Gear Vendor.
If just a street truck with few/light hauling duties, consider a Tremec T5-Z ("World Class")... it is rated at 300 ft.lbs TQ and should live fine behind a small block. Depending on options and resourcefulness, it would cost as a little as $1500.
If occasional heavy duty use or towing, then go with a Tremec TKO-500. Here is where I probably wouldn't buy a used tranny. That means the budget would require about $3500. I replaced the NP435 in my '70 with one.
Rear gear ratios should be between 3.70 and 4.10... I'd go with a 3.90.
If you don't mind going hydraulic...M5R2. owned a few, beat the hell out of every one and they took it.
Or a ZF-5, I believe they made them for the 302 bolt pattern. Again, hydraulic like the M5OD but built a little heavier duty. Either way will require a custom crossmember
I looked up the M5OD-R2. It was used in Ford trucks from 1987 to 2011 and sounds good. What do you guys think about it and how would the 1974 driveshaft fit?
I dunno Bill. All of my Ford trucks are older.I dont know anything about stuff as new as 1974 I'm just trying to help her and going by what she told me. Heres a picture of my newest truck. 1960, 460
plus a bracket I made for the A/C compressor
1960 Flareside pickup and the back end of a 1949 Ford car.
The 1974 cannot be a Camper Special if it has a 302, because only F100's in 1974 available with 302 and there were no F100 Camper Specials available after 1967.
The thing is, some people assume their trucks are Camper Specials, because when bought, have camper shells on them.
I'm sure you know more than her. Shes in love with her truck and thats good enough for me to help her. I had to fiddle with the pictures to get the right ones. The Crestliner is a 1950
I couldn't see enough of the trunk handle, it's different 1949 vs. 1950.
1949: Buick Rivera first 2 door hardtop, followed by Cadillac Coupe DeVille and Olds 98 Holiday hardtops.
1950: Olds 88 Holiday, Chevy Bel Air and Pontiac Catalina hardtops introduced.
FoMoCo was caught flatfooted, didn't have anything to counter these hardtops with until 1951, then only available in Ford & Merc, so they introduced the Crestliner and etc. in 1950.
Crestliner: 1950/51 Ford two door sedans "dolled up" with sweep side mouldings, fender skirts and padded vinyl roof.
There were also 1950/51 Mercury (Monterey) and 'baby' Lincoln (Capri) versions.