The Stovebolt Site Forums The Shop Area Driveline Which clutch disc??

NAPA shows two clutch discs for my 1950 half ton, 216 engine with three speed on the tree. Both have 10 splines and 6 springs.

1. Disc spline size = 1 1/8" Clutch size = 9 1/8" Disc hub I.D./ input shaft size = 9 3/16"

2. Disc spline size = 1 1/8" Clutch size = 10" Disc hub I.D./input shaft size = 10 9/16"

Both kits have the clutch and everything else needed to do the job. Which one should I get for my application?

Thanks!

I think the best thing would be to get the one like the one you have on the truck now.
Harold

I always get the largest clutch that will fit. I would also reccomend a diaphragm clutch over a borg and beck clutch... The diaphragm is way easier on the left foot.

Can you get to your flywheel? Mine was off the truck, so I just took it in with me and we fit one up to it... I originally ordered a 10", but ended up needing the 11" on my flywheel ( I had a different combo than you). But easiest way if you dont have the old stuff is to take the flywheel in

Flywheels are drilled for only one size pressure plate.
You will need to know what size is in your truck now to get the right replacement size.
9" was standard, but there was a larger size option, and who knows what could have been put in over the years.

My 261 has an 11 inch clutch, but what matters here is the flywheels surfacing. Is your flywheel surfaced for 9 inch, or 10 inch? Dave is the resident expert.. worth looking hard at your flywheel.

Well, I know my truck is all original, so based on what Dave says I need the 9". I thought that I would go to a larger size while I was replacing, but if it won't fit then I don't want to replace the flywheel just to get a larger clutch. I'm not pulling anything with the truck, just thought I'd upgrade while I was in there.

Thanks everyone!

In case you missed it I said 9" was standard, your truck could have been ordered with the HD clutch.

I for one use the smallest disc on most jobs. The reason is, in my experience the larger the disc the more chance you will get clutch chatter and it is easier for the synchro's to bring to speed.

Now that is something new, I'd never heard... I had always figured to go with the larger clutch. I have flywheels for both......

John

Dave, Makes sense that the potential for more chatter is with the larger clutch because there is more surface area. I'm like Whitelightening in my thinking that bigger is better and that while I was in there I'd put in the larger clutch. I'm here to LEARN so I'm not going to do something opposite what others have already done and gained experience from. If you've installed clutches on these old AD's (I haven't) then you have the experience I don't and I'll default to your recommendation to go with the smaller clutch. Like I said, I'm not going to be pulling a trailer or stump with my truck so I don't really need the larger, HD clutch so I'll avoid future problems like chatter and install the standard 9" clutch plate unless I get in there and see it's the larger 10". I was just going to buy the clutch ahead of time and have it ready for me and the mechanic to put in at the time of disassembly.

Thank you for your suggestion.