Np435 clutch

Np435 clutch DEFAULT
Just got the engine back in Andrews truck and it runs very well. Drove it down the road for a test run and the engine is fine, but while we were driving it around the main spring in the clutch broke ( Diaphragm type PP) and it will need replaced. We looked at the clutch while it was out and it looked good so we decided to just leave it in. Bad decision, now the motor has to come back out. With it being a 4X4 it is easier to pull the motor.

Problem now is where to get a clutch? Advance - none available, Auto Zone - none available, Rock Auto none available!! Am I losing my mind. They built 27 million of the these trucks with the 11" clutch and NP435 transmission and I can't buy a clutch and PP! :cry:Well I am guessing someone on here has purchased one, and will help me out. Thanks for letting me vent!

Are the V8 trucks with the 11" clutch the same as the slant 6?

Thanks to all.

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Correct clutch kit for 390/np435?

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jor
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re: Correct clutch kit for 390/np435?

Postby jor » Wed Nov 29, 2006 9:12 am

I bought a clutch pack from NAPA last year for $143. I ordered the standard for a 390 and it fit. I think it's an 11 inch.
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re: Correct clutch kit for 390/np435?

Postby willysrul » Wed Nov 29, 2006 12:00 pm

Just bought one yesterday. The book calls for a 11.5" for my 390 but my flywheel took a 11" which is fine with me because the 11.5" is about 80 bucks more. AC Delco 160.00 plus tax
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re: Correct clutch kit for 390/np435?

Postby Fordfool » Thu Dec 07, 2006 7:26 am

I have since inspected my clutch disc and pressure plate and they are just fine. My throwout bearing on the other hand will need to be replaced. My pressure plate measures 11 3/4" so I figured it would have to be a 11 1/2" model. Mine actually looks new. Cool something I don't have to buy!
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Old 11/30/17, 10:43 AM  

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So I may or may not keep the NP435 that is installed in my father in law's EB. When he bought it the transmission and t/c were installed but the motor was out. We will be installing a motor in the coming weeks but I don't know what size clutch it needs. Would it be the same size as a stock 3spd as it is using the 302 bell housing? 10" OR 11"?

Thanks for the help!


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Old 11/30/17, 11:00 AM  

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Old 11/30/17, 01:51 PM  

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Yes x2
As long as it's the stock original cast-iron housing (some early models did use aluminum though) the 11" clutch is what most V8 Broncos came with.
Double check your flywheel's bolt pattern though, as that along with the size of the bell housing are pretty much what dictate things like this.

For starters, count the ring-gear teeth. If it's 157 then someone installed the smaller car version and you'd probably not fit an 11" clutch cover. If it's 164 teeth on the other hand, at least it's the proper diameter and will more likely have the 11" pattern.

I guess there is also a "large" 11" pattern, but I'm not sure about all the subtleties here. I always just called them 10's and 11's too, so I could be a little off-base.

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Old 11/30/17, 02:47 PM  

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11" - head to your local parts store and get a clutch for a 80's Ford pickup that had a NP435. Order the 11" flywheel and clutch kit from them - cheap and strong. I clutch dumped my setup with 4.11 gears and 43" tires thousands of times and it held strong every single time.


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Adjusting clutch on np435

Clutch, transmission, rear axle

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Adjusting clutch on np435

Postby lennyp » Sun Jun 04, 2017 11:23 am

I'm having a problem with my clutch on a 1970 ford f250 4x4. The clutch engages with the slightest movement of the clutch pedal. I have about 1 to 1 1/2" of free travel in the pedal. Having a problem downshifting from 4th to third. How can I solve this problem? Just had the transmission out to replace the clutch fork pivot clip. Clutch looked fine. Any help will be greatly appreciated.

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Re: Adjusting clutch on np435

Postby Lee » Sun Jun 04, 2017 7:03 pm

Well,... this is the way I do it....

Take the inspection cover off from the bottom of the flywheel. Look up in there at the Throw out bearing. I then adjust the clutch rod linkage so that the Throw out bearing is close but not touching the pressure plate springs. Say 1/8 to 1/4 inch gap.

If the bearing is touching the pressure plate it means it will be spinning all of the time and will prematurely fail.

hope this helps,
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Re: Adjusting clutch on np435

Postby Busboy » Sun Jun 04, 2017 7:58 pm

Ive seen pressure plates drag due to worn levers. Even though your free play is right it will still drag. Are you able to shift it into first at idle without grinding? That should tell you whether or not the clutch is disengaging completely.
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Clutch np435

390/NP435 Clutch confusion ...

I'm trying to find a clutch for my '73 Highboy 390/NP435.

I tried the 11" Clutch set from Autozone and the pressure plate bolt pattern was around 3/8" too small.

Searching FTE and Rockauto.com ... yields information on 11"/11.5"/12" clutches. I'm trying to figure out which one matches my flywheel.

The problem is that I'm underway for the next couple weeks ... I can't take any measurements.
I really want to have it ordered and delivered by the time I get home.

Here's what I know. I've got the 3-finger type pressure plate and the old clutch disc measured larger than 11" ... It was 11.5" or 12".

Here's what Rockauto lists ...

---------------------------------------------
BRUTE POWER Part # 90206 {Cover Type: Lever; 12x10Tx1 1/16}
---------------------------------------------
RHINO PAC Part # 07027
11" OD x 1-1/16" ID x 10T; w/ 11" Clutch
----------------------------------------------
ACDELCO Part # 381115 {replaces 88989136 #88989136}
PLATE KIT,CLU PRESS & DRVN(W/CVR) [US vehicles]; LEVER; 12X10TX1 1/16; MAY BE LARGER DIAMETER REPLACEMENT CLUTCH. FLYWHEEL MUST BE REPLACED OR RESURFACED.
----------------------------------------------
RHINO PAC Part # 07514
11-1/2" OD x 1-1/16" ID x 10T; w/ 11-1/2" Clutch
----------------------------------------------
CENTERFORCE Part # DF200015
Centerforce Dual Friction; Clutch Kit; Size 12 in.; 10 Spline By 1 1/16 in.; Incl. Pressure Plate/Clutch Disc; Does Not Incl. Throwout Bearing
----------------------------------------------

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