NC WTB NP440 / MY6 4 speed OD trans

[bonehead]

Want to buy: NP440 / MY6 4 speed OD transmission for my auto to manual conversion project on my 1966 C-10. 2wd not 4wd, 1981-1986 Chevy and GMC

Here is a pic of what they look like. Would like the whole setup; bell housing, trans, shifter; but will take the trans only.

Leads welcome too, Thanks )bone(

[Brad54]

Just so you know, the shifter is specific to that transmission, so get the shifter, too.

There are two mounting patterns: one requires the specific bellhousing, the other will bolt to a regular Chevy bellhousing.

-Brad

[mixermike]

Just put one in my 63 about 2 months ago and I absolutely love it. I had a 3 OTT behind a 283 with 3.73 gears. This tranny changed the whole truck. I found a transmission with the standard chevy bolt pattern so it was easy.good luck in your search

[Greg63]

Yes - I swapped one into mine last summer. I pulled my M21 Muncie for it and it was a direct bolt in. Same bolt pattern as my existing bellhousing, same output shaft (new hole in floor for shifter).
As Brad said - get the shifter with the trans. It is a Hurst built piece.

Also, the MY6 trans runs Dexron II automatic transmission fluid. See here;
https://www.google.ca/url?sa=t&rct=j...65788261,d.aWw

Greg.

[Greg63]

Not sure if this is current, but it is a lead;
https://www.google.ca/url?sa=t&rct=j...rmTS-BHkwigseA

Greg

[bonehead]

Thanks for the input. I am looking forward to the swap and its good to hear some success stories.

[Brad54]

Originally Posted by bonehead

Thanks for the input. I am looking forward to the swap and its good to hear some success stories.

I put somewhere between 50,000 and 80,000 miles on mine. I have 80,000 on the motor, and it went in sometime after that... maybe... I might have done it all at one time, but I forget.

Anyway, awesome trans, I'm extremely happy with it. 3.42 gears in the factory Dana 44, and it just hums down the highway at 80mph.

I had to make a thin sheet metal gasket between mine, with a reinforcement rib bead-rolled into it, because the trans fluid leaks out between the counter shaft and the case. On the Mopars, the whole case is tight against the face of the trans, so a wipe with RTV takes care of it. On my Chevy, I made the thin metal gasket, and the problem was eliminated.

One thing about those transmissions, from the Mopar guys, is that with a lot of power and abuse, the counter shaft will wallow out the hole in the aluminum case. I've not been kind to mine, and have had no problem, but it's something to keep in mind.
There IS an iron-case version of this trans, that would eliminate that problem. It has the Mopar-style mount and requires the special factory bellhousing. I just found one at my swap meet last year, and am keeping it for a future project.

-Brad