Thee Elusive NP440/MY6 OD Trans

[mikiesride]

I am looking for as much information on this trans as I can get. I am looking to buy a 74 1/2 ton that has a sb V8 ? ci's, granny 1st gear believe its sm465, and its a lwb, fs truck. I haven't seen it yet and was told very little about it but for what he wants its a steel, this guy isn't in a hurry so it gives me a chance  to gather up info. All of the molding and badges are gone/shaved and hes not real sure what it is model wise. I like the style and most of all no smog.

I have some info on this trans but thought since the trans came on 81-87's (73-87) this forum/spot is good enough to start getting info from first hand people owning them. Will it bolt up to the bell that's in it now using whats there in TO brg. fork? What's the length? Will start with these questions first and go from there. thanks

[zieg85]

Well the bell housing may work as I've seen the bolt patterns both way.  The transmission never came in anything other than a diesel or low powered 5.0L trucks.  I have a picture of the bellhousing most need.  I will try and find it and post it

[mikiesride]

Carl, that's the trans pattern style of a Dodge A833 IIR. I have read some info about that trans (A833) having a longer input shaft not suitable for GM. All pics/info I've seen for that trans says its a Aluminum case that has its problems with wallowing out the inside case then needing a bushing repair. Its the "cast iron case' is what my attention is fixed on being a much stronger case. Not sure what trim Level it comes in other than maybe coming from 4X4's.

[zieg85]

The early one are said to have the original GM style and the later the other.  Back in the day I purchased a 1983 GMC that had the later style and most of the bell housings are dual pattern 83-84 and 85 or newer with the hydraulic clutch

[zieg85]

Carl, that's the trans pattern style of a Dodge A833 IIR. I have read some info about that trans (A833) having a longer input shaft not suitable for GM.

The only difference is the mounting pattern up front.  GM had both versions as I have 3 in total I've collected, new newer that takes the bell housing that is pictured 83 and newer as well as an older one that looks like the standard transmision bolt up

[zieg85]

I found a couple of pictures on-line between the different mounting patterns.  The first is a GM case for the MY6.  Second is the older style. 

[mikiesride]

I found a couple of pictures on-line between the different mounting patterns.  The first is a GM case for the MY6.  Second is the older style.

I also found one with six (6) mounting holes but can't download to here  due they are to large of file for here. The six hole one looks just like your last 2nd pic but with six drilled holes.

[mikiesride]

I found a couple of pictures on-line between the different mounting patterns.  The first is a GM case for the MY6.  Second is the older style.

I guess New Process had the Mopar bolt pattern 4 holes almost opposite of GM's bolt pattern being the lower bolt hole is on the passenger side unlike GM's lower bolt hole is on the drivers side for the 4 hole trans and as well with the 3-4 shift lever on Mopars trans is upward and GM's 3-4 shift lever is turned downwards. The pic above shows a 6 hole bolt pattern trans that I would like to know where it or what it came out of, yr, make, model things like that.

I'll post two pics of Mopar trans and bell's one is for Hemi and other one multi holes is for slant 6. pics might be real small.

[zieg85]

Remember the A833 Hemi style was not an OD and the levers would be like your pictured showed.  When they turned it into an OD transmission that gear is in the 3rd gear position so the lever has to be turned upside down

[mikiesride]

Remember the A833 Hemi style was not an OD and the levers would be like your pictured showed.  When they turned it into an OD transmission that gear is in the 3rd gear position so the lever has to be turned upside down

I was just sharing what the difference of the Mopar trans bell housings looks like for others down the line.  I have been told you can swap  most of the insides not all but some. I have heard from other places/forums that the GM bell housing has the same bolt pattern as the Mopar does, this is why I posted what the Mopar & the Hemi Bells look like quite a bit difference and not the same for GM's fitments.

Still wondering what this trans comes from