What can be said about the 4-speed New Process NV833 overdrive manual transmission?

[MusicMan70]

Hatzie, this was posted by Dazzoman on another thread.
I believe he said it was from a 4wd Van application.

[hatzie]

Yep. It's all in the shifter and linkage.

The paddles tell which side reverse is located and the rotating lever selects whether you push up (forward) or pull down (back).

This linkage has Rev on the LH paddle and the rotating lever is aimed down so Reverse is Right and pull down (back).
If you used this "down" Rev rotating lever on one of the RH Reverse paddle shifters it would place Reverse to the Left and Down.

[Dazzoman]

Originally Posted by barry1982

Reverse on my cast iron A833's is to the left of 1st and up. Strange.... but that's where it's at. Both trucks are two wheel drive. I am actually in the process of restoring one of them. I was in a head on collision with the other in the early 90's, and just kept it around as a parts vehicle. The accident was so bad, the aluminum bell housing broke when the frame twisted.

Yes the reverse is the same on mine as well ....Interesting - I hope I or someone els who drives it won't think R is 1st LOL !
I will be selling the aluminum unit with aluminum bell housing and floor shifter for $1k . IT has all new gaskets, seals , o rings ready to go .

[Dazzoman]

Originally Posted by hatzie

Yep. It's all in the shifter and linkage.

The paddles tell which side reverse is located and the rotating lever selects whether you push up (forward) or pull down (back).

This linkage has Rev on the LH paddle and the rotating lever is aimed down so Reverse is Right and pull down (back).
If you used this "down" Rev rotating lever on one of the RH Reverse paddle shifters it would place Reverse to the Left and Down.

All true , but on my cast iron MY6 you don't get to swap that feature on the reverse , I tried and it wont shift .
This is all for 2 w drive I think .

[hatzie]

Originally Posted by Dazzoman

All true , but on my cast iron MY6 you don't get to swap that feature on the reverse , I tried and it wont shift .
This is all for 2 w drive I think .

You need the push forward (rod on top) or pull back (rod on bottom) rotator levers with the correct mating paddles and rods.
They are a mated set. 'Swhy it's so much fun when one piece goes AWOL. I doubt you can just flip em 180° and have the relay rod line up. Sorry I wasn't clear.

[hatzie]

Originally Posted by MusicMan70

Hatzie, this was posted by Dazzoman on another thread.
I believe he said it was from a 4wd Van application.

That's a 2wd transmission. Only way that's 4wd is a divorced transfer case.

[mr.chevy]

Well this is an interesting thread. I am building a 1967 Chevy C20 that has been shortened and converted to a C10 suspension. Has a 327 and about 7 years ago I bought a steel housing new process 833 OD trans of a guy on the local classifieds for 75 bucks. Everything but the bell housing included. Put a want add for one and picked it up for 50 bucks. Bought a cross member from classic performance products that was for an automatic trans and a mount for it and it all fit in prefect. Shifter will work with the bench seat. The bell housing I managed to get has a slave for a hydraulic clutch so that's what's going in it.

Lots of good info on this thread!

[D13]

Originally Posted by hatzie

I wouldn't worry about the Aluminum case A833 breaking behind a V8

Please, NO! The early 440/Hemi 833's and these are NOT the same! The overdrive swap reduces the torque capability dramatically. These were NEVER factory offered with anything stronger than a 305. They were not available with 350's or 454's because they simply will not hold up to the torque.

If you ever swap in a 350 you will need to swap out the trans unless you drive very light footed, in which case why did you put in a 350?

[Dazzoman]

Originally Posted by hatzie

The 305E V6 took a different everything. That's no longer an issue since you've swapped in a 292 I6.

The post 1964 Inline 6 used the standard Chevy bellhousing pattern. The 1966 Chevy clutch pedal linkage will push the fork on the A833 bellhousing just like the fork on the old SM420 bellhousing.

The MY6 NP440/A833 has the same 10 spline input shaft dimensions as the SM465 & SM420. You have a good flywheel fitted on the 292 so get a few thousandths faced off it to clean off any thermal damage and buy a complete new Sachs clutch kit (pilot bushing, throwout bearing, friction disc, and pressure plate) so you don't have to mess with it again.

Driveshafts are really no big deal. Get a yoke for the A833 and mate it with a shaft that's the right length. If the Yoke and the driveshaft have different size Universal Joint cups you can buy hybrid joints.

You may have to move and or mod the transmission crossmember. This is probably the worst part of the job and it's bloody easy.

BTW I have huge success with this trans ! I ended up with the cast iron model and LOVE IT ! Big gas mileage difference and smooth shifting ! The only thing is I have no reverse light working because the switch on the tranny works when it wants to , other then that its amazing !

[hatzie]

Originally Posted by D13

Please, NO! The early 440/Hemi 833's and these are NOT the same! The overdrive swap reduces the torque capability dramatically. These were NEVER factory offered with anything stronger than a 305. They were not available with 350's or 454's because they simply will not hold up to the torque.

If you ever swap in a 350 you will need to swap out the trans unless you drive very light footed, in which case why did you put in a 350?

I have run the AL case A833 OD behind 318 & 340 V8 motors in 1/2 ton 2wd Dodge trucks with no problems whatsoever. I wouldn't be worried about a standard or mildly modified 350 at all.

It's not magic. They use the standard 4th gear as 3rd and changed the output ratio of 3rd gear. The angles of the gears are the same and the case is a heavier wall casting.

[Dazzoman]

Originally Posted by Keith Seymore

Mine came from the factory with an external speedo adapter.

K

I ended up with an Taiwan made cable for $20 but at least it has the right length and works fine .
I LOVE THE TRUCK now because this iron trans kicks ass , noticeable gas milage !

[Dazzoman]

Originally Posted by MusicMan70

This is where the shifter location moved in my 61 GMC Suburban; Previously it had the SM420.

MIne is finally done and it kicks ass !!!
Thx !

[Dazzoman]

Does anyone know if the reverse light switch can be made to work ? MIne works when it wants to ...
Dazzoman

[hatzie]

Get a new switch.

[Dazzoman]

Originally Posted by hatzie

Get a new switch.

OK thanks .

[Chevystep]

Bell housing and fabbed up dust cover...

[Hewfil1]

Just gonna throw a post in here to keep it on my back burner.

[LEEVON]

Selling my complete NP833: http://67-72chevytrucks.com/vboard/s...97#post7773897

[MusicMan70]

That link didn't work for me so I'll repost what did.

http://www.67-72chevytrucks.com/vboa...d.php?t=723002

That is a killer deal for a complete unit.

[65Robb]

So i got almost everythimg i need for my install just got a question did anyone that has done this install use a crossmember an have to move the stock e brake crossmember?

[Chevystep]

For those of you using this tranny in your 60-66 with stock wheels, what speedo gear do you need to make the speedometer read correctly. Driven gear numbers? Summit racing?

[MusicMan70]

Yeah that was something I forgot about after I had it rebuilt. I ended up going with a GPS Speedo. You'd have to know what you have in there now and then research the gears you would need.

[LT7A]

In the early pages of this thread, someone mentioned a possible adapter for 4 four-wheel drive versions of this transmission. Anybody know if those exist? I'd like to put one of these into my 82 GMC C15. But I'm wondering if I need to find one out of a two wheel drive? It seems there is some concern with the length of the output shaft and the different tail housing. Obviously they were meant to mate up with a transfer case. BTW, thanks to the couple of guys that I pinged about this offline. Wanted to throw it out to a wider group, and see if I could get more details. Thanks LT7A

[Dazzoman]

I haven't heard about adapter for a 4WD MY6 for 2WD MY6 or bysa versa .

Question guys :
Will the iron MY6 handle the 350 w/ cam, duel headers , new 4 b carb ? Hatzie says yes - I'll probably do it .

I'm building an stock 350 (with whatever cam I haven't decided on yet ) for my 66 GMC 3/4 ton (recent conversion) MY6/ 6 cyl 292c .
The 292 runs great but the head gasket is leaking occasional oil ( weird ) and needs better fuel carb , sluggish .
I thought of an 283 instead so I can supposedly get better gas milage ....But then again bigger motor works less hard = less gas . Right ?
Isn't the 350 less weight than the 292 ?

[hatzie]

I've run the Dodge Aluminum A833 OD behind a 340 in a 1/2 ton Dodge Pickup with a mild almost RV grind cam. The only serious difference is the Dodge dimensioned input shaft and maybe the output shaft spline count.

I have a 1:1 4th gear Cast Iron A833 behind a 383 in a C-Body 69 Dodge Polara.

I really don't see what the wild difference is between the CI case transmission and the aluminum case version is. The Al case is actually slightly thicker than the CI case.

I believe the 4x4 version of the GM A833 OD trans is an MM7. 2WD is MY6.

The Cast Iron Case version should work fine with a 350. I'd be sure to check all the bearings etc before you put it in. They are close to 40 years old and lord only knows what the previous owners did to it.