Size clutch
Postmaster
Joined: Jul 2003
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From: Pittsburgh
There is honestly no way to tell without taking it all apart first. You'll hear people say 4x2 trucks got 10", some will say 4x2's with 3 speeds got 10" but the 4 speeds got 11", others say all 4x4's got 11". . . really no way to know, especially since the clutch has probably been changed at least once in the truck's life and who knows if the flywheel was changed.
The '80 4x4 parts truck i used for the conversion on my truck had a 300 and a 4 speed but only a 10" clutch while the clutch that was in my 85 4x2 4 speed was an 11 inch behind a 300.
Besides, there's no point in putting a clutch in without getting the flywheel resurfaced. While the flywheel is at the machine shop, just measure the disk or take the old pressure plate with you to match up at the parts house. (The pressure plate is the important part, it's what needs to match the bolt pattern in your flywheel)
Justin
The '80 4x4 parts truck i used for the conversion on my truck had a 300 and a 4 speed but only a 10" clutch while the clutch that was in my 85 4x2 4 speed was an 11 inch behind a 300.
Besides, there's no point in putting a clutch in without getting the flywheel resurfaced. While the flywheel is at the machine shop, just measure the disk or take the old pressure plate with you to match up at the parts house. (The pressure plate is the important part, it's what needs to match the bolt pattern in your flywheel)
Justin
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New User
Joined: Oct 2006
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it has a 300 inline six 4 spd 2wd. I talked to one parts place and they said something about having a hydralic clutch or mechanical cluthc could also tell me the size. and yeah i planned on doing the flywheel and ring gear. thanks
Postmaster
Joined: Jul 2003
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From: Pittsburgh
hydro clutch vs. mechanical is just a year difference, 1982 is when it went hydro IIRC. You really are just better off taking apart and measuring. Either that or if you were intending to ::replace:: the flywheel, just buy an 11" flywheel and clutch.
Justin
Justin
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I believe the flywheel is drilled for both the 10 and the 11 inch clutches.. If so doesnt matter what one you use just that you will have to change the bolts when going from the smaller to the larger one..
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Postmaster
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From: Pittsburgh
Some flywheels are double drilled, but not all. my 10" flywheel was single drilled and my 11" was double drilled.
All replacement wheels i've seen have both patterns, but factory ya just don't know.
Justin
All replacement wheels i've seen have both patterns, but factory ya just don't know.
Justin
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Postmaster
Joined: Jul 2003
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From: Pittsburgh
It's a matter of grip. the 11" disk has more friction area than the 10", so it grabs better, proportional to the increase in surface area. The 11" pressure plate also uses a heavier spring, so it clamps harder.
The 11" has about 18% more torque capacity based solely on the area and about a 7% increase from increased clamping forces. Therefore, a stock 11" clutch can handle about 25% more power than a stock 10" clutch.
Justin
The 11" has about 18% more torque capacity based solely on the area and about a 7% increase from increased clamping forces. Therefore, a stock 11" clutch can handle about 25% more power than a stock 10" clutch.
Justin
Last edited by hoxiii; Oct 25, 2006 at 12:14 PM.
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New User
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Would you recommend changing from a 10 to an 11 inch. im gonna be using the truck to get wood and stuff like that. also do you know if the tranny from the 300 i6 will work with a 400 big block. im thinkin bout doing a conversion.
Cargo Master
Joined: Apr 2003
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From: Parkesburg PA
Originally Posted by hoxiii
hydro clutch vs. mechanical is just a year difference, 1982 is when it went hydro IIRC.
4th was totally useless... Don't know the clutch size...As for the trany swap behind the 400 it depends on the trany. Some are junk (or will be) behind a bigger motor. SROD comes to mind.
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Joined: May 2006
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Originally Posted by f100beatertruck
My 83 F100 was mechanical. 300-6 and SROD, 8.8 rear with 2.47 gears 4th was totally useless... Don't know the clutch size...
As for the trany swap behind the 400 it depends on the trany. Some are junk (or will be) behind a bigger motor. SROD comes to mind.
4th was totally useless... Don't know the clutch size...As for the trany swap behind the 400 it depends on the trany. Some are junk (or will be) behind a bigger motor. SROD comes to mind.
My 83 4x4 has a mechanical clutch also, and originally came with a 300.
Postmaster
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From: Pittsburgh
If it's dual drilled, get the 11" since they're the same price. if single drilled, get whichever fits UNLESS, you need to change flywheel. If the flywheel needs replaced anyway, go 11.
If the flywheel is a 10" and is still good, might as well just stay with the 10" setup.
With a 300 and 3.0 gears I've overpowered an older stock 10" clutch, when i changed it i went to 11 and haven't had an issue.
as for 300-400, it does depend on the transmission. If you have a granny low 4 speed it'll be fine. All it takes is the 400/351M/429/early 460 bellhousing and the frame perches for the motor mounts. I'm sure there are all kinds of hookup details like with the radiator and all, but motor into frame and to transmission is pretty straight forward.
If the flywheel is a 10" and is still good, might as well just stay with the 10" setup.
With a 300 and 3.0 gears I've overpowered an older stock 10" clutch, when i changed it i went to 11 and haven't had an issue.
as for 300-400, it does depend on the transmission. If you have a granny low 4 speed it'll be fine. All it takes is the 400/351M/429/early 460 bellhousing and the frame perches for the motor mounts. I'm sure there are all kinds of hookup details like with the radiator and all, but motor into frame and to transmission is pretty straight forward.