D478 manual transmission identification and options
 

Hello, I am having some difficulties with identifying the transmission that is bolted up behind my d478 engine. The transmission has bad bearings so I'm looking to replace it. I am pretty sure the transmission is an np435 Due to the inner gear structure and the outside layout. Apparently the shifter is from a Ford I also know that the GM bolt pattern for the np435 is unique. I would like to know what was installed behind the d478, and does anybody know of a company that makes an adapter plate For this transmission to a nv4500 or any 5 speed varient?
I have attached photos of the trans and bellhousing.
The input shaft has 6 1/2" stick out with a 1 1/8" 10 spline shaft with bellhousing mounting holes approximately 8 1/4" wide on top, 9" wide on bottom. 4 3/4" right side and 5" left side.

Re: D478 manual transmission identification and options
 

Hello Murdoc, Novak has lots of information here;

https://www.novak-adapt.com/knowledg.../manual/np435/

and a mention of using a Ford version NP435 without an adapter here;

https://www.novak-adapt.com/catalog/...gm/ford-to-gm/


NV4500 adapters or information

https://www.advanceadapters.com/cate...r-packages/79/

Re: D478 manual transmission identification and options
 

I have read that page a few times actually, the main issues that I find are the ford np435 claims a 1 1/16" shaft and mine measures 1 1/8". Also under the GM /Chevrolet version it states "None of the GM NP435's are compatible with our adapter assemblies." making me think it has a different bolt pattern, given the photo of the bellhousing from your 2nd link and my own bellhousing, I think that bottom right bolt is different at least.
I see now that it says you can drill the hole to match, sorry I missed that before.

Re: D478 manual transmission identification and options
 

I wonder if one of these from V12 would work to get you the transmission you want?

http://thunderv12.com/about_our_engines

https://i.postimg.cc/SR1QkQkL/V12.jpg

Re: D478 manual transmission identification and options
 

As much as I would love to throw a v12 in, there's not much info on the transmissions used other than "Chevrolet trans" that I could find.

Re: D478 manual transmission identification and options
 

What transmissions were used for the Toro-flow diesels? Was it the sm420's?

Re: D478 manual transmission identification and options
 

I was thinking if that adapter from the V12 website would bolt up to your Toroflow, then you'd have more options on the transmission.

I do not know if the Toro's have a unique-to-them bell housing.

Re: D478 manual transmission identification and options
 

Same, honestly I'm not even sure if the diesel / gasoline versions of this engine have different bellhousings. I can't even be 100% that this is the original combo for this motor. I haven't been able to find anyone else talking about a np435 on a Toro-flow. I was also thinking I could just try for an overdrive system for the np435 but it's expensive

Re: D478 manual transmission identification and options
 

Not sure if this would help, but my 478 Gas had a 5-Speed Clark.

I doubt a Toro-Flow would have an SM-420.

Also a Toro-Flow was a Gas Engine that was made to be a Diesel. Should be the same Block to accept a typical trans.

Re: D478 manual transmission identification and options
 

Don’t know much about the 478, but I’ve removed a few 351s from grain trucks out here and they’ve all been running the NP540 (no overdrives) and 1 1/8” 10 spline inputs in the standard style bell housings. I’m sure they’d handle the power of 478 but only have 1:1 final gear.
Just throwing that out there

Re: D478 manual transmission identification and options
 

Thanks for the info, do you happen to know what model Clark it was? I looked into the np540, didn't know about them. Looks like a perfect match. Too bad they are rare in overdrive models. I did find a forum thread on a bronco site from 2007 talking about a place in Colorado that apperently was able to rebuild np435's to 5 speeds possibly using np540 gears in the case. Pretty crazy stuff. Too bad the company in question closed in 2002

Re: D478 manual transmission identification and options
 

Not sure what model Clark it was, but the charts over at Jolly's '60-'66 Truck site may help you out. I see that one model Clark had an OD, but I believe they are pretty rare too.

Only thing I can tell you is that along with the 2-Speed Rear, my Clark had an irregular Shifting Sequence:

1L
1H
2L
2H
3L
3H
4L
5L
4H
5H

1L and R were nice and low geared as well in the '62.

My '67 7500 also had the same Shifting Sequence which I believe was also a Clark.

Here is the link to his site:

http://www.6066gmcguy.com/

The Trans info is here:

http://www.6066gmcguy.com/SM420.html

Re: D478 manual transmission identification and options
 

As it turns out, the bellhousing for this particular motor has the 2 rear motor mounts bolted to it. So it looks like I'm sticking with the np435 and am just going to have to have it rebuilt.

Re: D478 manual transmission identification and options
 

Just ordered replacement clutches and pressure plates from capitol clutch and brake Inc. Great guy, really helped me find the right parts (I hope) for anyone who what's to know, the pressure plate part number is "ILL NCA-330-1938", the clutch part number is "M-458-CV" I can find literature on the pressure plate but not the clutch. In the pdf for the pressure plate you can ignore the "spline size" as that goes for the clutch that comes with that plate, they just ordered a different clutch that has the correct spline and diameter. Just for future people going thru the same issue that I am. I also ordered 2 clutch disks just in case they become scarce. I also was able to find a nos intake/exhaust manifold gasket.

Re: D478 manual transmission identification and options
 

BILL T. Seems like GMC used a lot of those Clark 5-speeds with what were called "Working 4th & 5th gears. Guy Dad hauled livestock for had two early '60's GMC semi-tractors, single axle gas powered and one for sure had the "working 4th & 5th. Both were the 72" BBC steel tiltcab. The IH CO-190's with Red Diamond 450-6's had the progressive shift pattern. The same guy bought a new '65 Chevy C-80 short nose conventional single axle tractor that had a TORO-FLOW in it, D-478 I think. If Dad had his choice, he'd always take that C-80 with the Toro-Flow before taking a tilt cab of any style. The trucking company owner traded the two CO-190's for Emeryville's, a 220 Cummins powered tandem rear axle with 5-3, other was single axle with 185 Cummins and 5+2.