460 Trans ?
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Freshman User
Joined: Feb 2002
Posts: 44
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From: Broadlands USA
460 Trans ?
Howdy all
I got a 1967 F800 with a 391 and 5 speed, i wanna change to a 1972 460 engine on propane, but i dont have a trans to go with it. I want a 5 speed with over drive, but dont know what the options are or what to look for so i get the right clutch and imput shaft.
Other option is to just over haul the 391 and go propane and just swap rear end gears.
my problem is i need more speed, right now im 3600 rpm at 60 mph with tall 22.5 tires i dont think when i slow down the 391 on rpms i will have enough power. But with a 460 at 2500 rpms at 60 mph i should be more then fine.
not to concerend with fuel milage right now i get 4.5 mpg at $3.10 gas
with propane i will be 4.5 mpg at $1.80 gas sound like a great idea and im used to running propane tractors and pickups so thats no big deal.
Just wondering if you guys had any ideas
thanks
Shawn
I got a 1967 F800 with a 391 and 5 speed, i wanna change to a 1972 460 engine on propane, but i dont have a trans to go with it. I want a 5 speed with over drive, but dont know what the options are or what to look for so i get the right clutch and imput shaft.
Other option is to just over haul the 391 and go propane and just swap rear end gears.
my problem is i need more speed, right now im 3600 rpm at 60 mph with tall 22.5 tires i dont think when i slow down the 391 on rpms i will have enough power. But with a 460 at 2500 rpms at 60 mph i should be more then fine.
not to concerend with fuel milage right now i get 4.5 mpg at $3.10 gas
with propane i will be 4.5 mpg at $1.80 gas sound like a great idea and im used to running propane tractors and pickups so thats no big deal.
Just wondering if you guys had any ideas
thanks
Shawn
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
The ZF 5 speed will bolt up to a 460 but the 5 speed is not rated for the F-800 32,000 GVWR truck. The 460 is not up to the task either. Maybe find a lima engine for the truck its in the 385 series witht he 460 but has 370 cubes and is a heavy duty engine. They also had better transmisson options. But the best way is to just get a new 391 FT for about 1,300.00.
Posting Guru
Joined: Mar 2006
Posts: 1,526
Likes: 2
From: fargo, nd
the 460 is better than the 370... the 370 would have the same d3ve heads as the 460, same engine family, bigger bore and more stroke. it would also be a significant power increase over either the 391 or the 370. if you want you could look for the 429 truck engine- it would be a better choice than the 370. the 385 series ft engines also have big (10 qt i think) oil pans. as for the zf not being rated for the gvw thats true, but with as low as the rear gears are it doesnt matter.
