Ok Im planning to build a Slant six trail truck in a yr or two. It'll be a 4spd(NP435) and I was wondering if I can use the flywheel for a 833/od? And possibly the clutch? Not real familur with manuals. Never had to work on one yet. Thanks

The OD833 used the 10.5" clutch and the NP435 used the 11" clutch. Both trannys do share the same 1"x23 spline input shaft.

It gets a little confusing.

A 130 tooth flywheel uses a 130 tooth bellhousing to get the starter to mesh. The most common size clutch for this is 10.5", although there is a 10.95" disk and plate that bolt on and give more torque capacity.

The 143 tooth setup uses an 11" clutch, usually the same disk (but not plate) as the 10.95.

The 11" pressure plate bolt pattern is used for either diaphragm or Borg&Beck types. These have six evenly spaced holes. Neat thing about this is the 11" B&B pattern is also the 12" B&B pattern. I installed a 12" pressure plate on my 11" B&B flywheel recently. It bolts right up. For a clutch disk I used a NOS Schiefer 11.5" disk that had the correct 1 1/8" 10-spline for the input shaft on my transmission.

You do have to match the clutch disk with the spline size and count, plus the OD. It's OK if the clutch disk is a little smaller, but not if it's a little bigger!

If you're drag racing or road racing, the smaller diameter flywheel is easier to accelerate or decelerate, and the smaller diameter clutch disk is easier on the synchronizers.

For my truck that may pull a load, I like the larger clutch size if I can find it. So my '77ford $500 truck is now sporting a 12" clutch, and my '64Dog will be running the 11.5" setup from above.

R.

PS: the 11 and 12 inch Diaphragms and B&Bs are the same for Chrysler products and Chevy trucks. There is currently a 12" B&B pressure plate on the 'Bay for $29.95, rebuilt, listed for chevy truck. If I didn't have mine already I'd be all over that.

That didn't answer my question. That just stated the clutch size.
Rock auto doesn't list any and napa doesn't either. Advance auto shows one but if I can use what I have that would save me money. Its going to be a budget build. The least about of cash spent the better

The build will be a Slant six with an Np435 in a 4wd with a gear ratio between 3.9-4.56 and 33" tires. I've located a bellhousing but still need the flywheel.

You can't figure out how to count the teeth on a flywheel?

Against my better judgement I wrote an answer to your question, that together with the one above it should have got you on your way.

But as usual it wasn't good enough.

Goodbye.

Whatever dude. I didn't see your reply.
Sounds like somebody needs to change their Tampoon!

Kenworthgoose used the 833 bell with the np435 flywheel

Hey Dodgeboy, I got a flywheel and clutch from the 833 OD I just pulled, you can have it , just pay the ride. PM me if you want it.

Mark

I have the whole 833/odd setup. I was just trying to see if I could use the flywheel and clutch from it for the Np435 Thanks though. Heck I have a new clutch still in the box. came with my 80.

My 1980 had that setup and it had the 143 tooth/11" clutch to go with the 435NP, I still have that flywheel somewhere but those bells are one of the stranger things I've ever worked with, most of not all the bolts were on the inside where it bolted to the engine

Mitch