Engine/ Toploader help
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Cross-Country
Joined: May 2018
Posts: 64
Likes: 2
Engine/ Toploader help
Hey guys. I'm building a 56 F100, mostly from parts from anything I can find.
My question is, I have a 351c and want to put a Toploader behind it. The one I found is a HEH-J from a Galaxie. It is a close ratio. I'm just wondering on how the drivability is going be with 4:10 in the rear. I have found so many mixed comments that go completely off track from the question. It is mostly going to be driven around town and some highway. I don't want to be going 55 and red lining the engine.
My question is, I have a 351c and want to put a Toploader behind it. The one I found is a HEH-J from a Galaxie. It is a close ratio. I'm just wondering on how the drivability is going be with 4:10 in the rear. I have found so many mixed comments that go completely off track from the question. It is mostly going to be driven around town and some highway. I don't want to be going 55 and red lining the engine.
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Joined: Apr 2004
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What size tire are you running?
For example, if you are running a 235/75x15, a 29 inch tire, you will be turning 3087 RPM at 65 MPH. Not the redline, but a bit high.
Do you have the toploader yet?
Are you going to hammer on this thing?
Is your motor a fire breather?
IF:
--no trans yet,
--no hammering
--no fire breathing
THEN:
Consider T5.
For example, if you are running a 235/75x15, a 29 inch tire, you will be turning 3087 RPM at 65 MPH. Not the redline, but a bit high.
Do you have the toploader yet?
Are you going to hammer on this thing?
Is your motor a fire breather?
IF:
--no trans yet,
--no hammering
--no fire breathing
THEN:
Consider T5.
Thread Starter
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Cross-Country
Joined: May 2018
Posts: 64
Likes: 2
Yes I do have the trans. I do not know much yet about engine internals, bought it about two weeks ago. I'm not going be out running cops on a daily base, but want it to be able to hold its own if needed.😁 I will never have it on the drag strip.
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Joined: Apr 2004
Posts: 34,529
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Well, that toploader will be fun with great gear spacing. The 4.10s will save you on start up and you'll be really glad for them when starting on a hill.
The RPMs at 65+ might serve as a governor for you!
Run it. Do you have your bell and clutch figured out?
The RPMs at 65+ might serve as a governor for you!
Run it. Do you have your bell and clutch figured out?
Super Moderator
Joined: Apr 2004
Posts: 34,529
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IIRC '57 to maybe '60 have juice clutches. Master looks just like the brakes. We had a '58 F600 but I never inspected the under dash or clutch fork set up.
In the later model stuff, quoting information here: Originally Posted by NumberDummy
In the later model stuff, quoting information here: Originally Posted by NumberDummy
Only 1983 F250/350's with 460's or 6.9L's have it (and Rangers).
Everything else got it in 1984, except Econolines with the Mazda 5 speed > 1986 was the first year.
Many if not all will be external slave, other than Mazda and most ZF transmissions.
Econolines used a vertical master that went through the floor via a bell crank or some other Rube Goldberg linkage under the dash.
Your pedals are under slung aren't they?
Everything else got it in 1984, except Econolines with the Mazda 5 speed > 1986 was the first year.
Many if not all will be external slave, other than Mazda and most ZF transmissions.
Econolines used a vertical master that went through the floor via a bell crank or some other Rube Goldberg linkage under the dash.
Your pedals are under slung aren't they?
Thread Starter
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Cross-Country
Joined: May 2018
Posts: 64
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No my brake pedal is firewall mount and I was going to fabricate the clutch pedal once I found something that would work. I will be going to the pick and pull again this weekend to see what I can find.
Thanks for all the help.
Thanks for all the help.
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Joined: May 2015
Posts: 4,475
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From: Tri Cities, TN
I'm just wondering on how the drivability is going be with 4:10.
Folks have been driving OD transmissions for too long. The first brand new truck I ever bought was a 1972, 3/4 ton GMC with a 4.10 gear. I put over 100,000 miles on it in 3 years, mostly interstate. Never worried about how many rpms it was turning at 80mph. It only hurts the gas mileage. I have a 3.70 gear in my 65 and it turns between 26 an 2800 on the highway, it kind of likes it there and just hums along at 9 mpg. Which works out fine since at my age that puts a tank of fuel and my bladder on the same schedule.
Folks have been driving OD transmissions for too long. The first brand new truck I ever bought was a 1972, 3/4 ton GMC with a 4.10 gear. I put over 100,000 miles on it in 3 years, mostly interstate. Never worried about how many rpms it was turning at 80mph. It only hurts the gas mileage. I have a 3.70 gear in my 65 and it turns between 26 an 2800 on the highway, it kind of likes it there and just hums along at 9 mpg. Which works out fine since at my age that puts a tank of fuel and my bladder on the same schedule.
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Joined: May 2003
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From: south louisiana
Is that Toploader a 390 transmission ? If it is the input snout is too short to work with a small block bellhousing. It will reach to the edge of the pilot bearing/bushing but not into it, leaving the input unsupported when you engage the clutch. If you can find a longer bushing (Boss 302/Bronco) you can fix this. Otherwise you'll need a small block input shaft for it. The 390's used the small block diameter input with a shorter snout. I would look into an aftermarket hydro clutch setup for this
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