New Process A833 4speed w/ OD MY6 MM7

[HotRodPC]

Just looked and it is a 3.08 with the G80 option. The code I have on my tranny is MM7

Yup. Exzachary what I figured it would end up being. You ever get the chance to score a used 10 bolt cheap with 3.42 or 3.73' axle, I can assure you, you'll like driving that truck even more, and might even get better mpg. That A833 trans does have a pretty deep first gear compared to the Th350 and Th400, and 2nd gear of the SM465, but still, I think it would take off from a light better with 3.42 and even better 3.73's getting you better in town mpg. And you'll like the torque feel alot better.

 

[Tyger13us]

I beleive it is MY6 is the 2wd of the A833, and MM7 is the 4wd Cast Iron A833 w Tcase package. So both RPO's will designate it's an A833.

I have the MY6 NP A833 with the hurst shifter in my 82c10 with 3.08's......

it is the aluminum box,, pretty tough also, i have beat the thing to death..

up shifts fine from 1th through over drive,, but have to double clutch to down shift,, it needs sincro's plus i run 80-140w gear lube in it.. from what ive read its suppose to use atf,, but its tired and needs to be re-freshed...

I found the only new over drive gear in the box from gm...

ive been looking for a over drive cluster that hasnt been abused......

dont tow in over drive,, it ruins the cluster gear bearing surface and counter shaft......

ive run it for 10 yrs so far,, i like it,, but it dont like to be speed shifted like a muncie and (IMO) i think its tougher,, i havent blown it up yet!! 31/10.5 15"s cooper stt and 3.08's?

Ive scattered 2 muncies and 3 sagnaws in my 82c10 6.2 and this MY6-NP-A833 is like a timex............

hahahaha

 

[BillyP]

Interesting, looks like the MY6 is the aluminum case and the MM7 is cast iron, which mine is probably because it's behind the diesel. I have just a shade over 200k on it and still shifts good.

 

[HotRodPC]

Yours is a Cast Iron 2wd Unit Billy? I've heard the Cast Iron units are stronger. But I've heard the aluminum ones tolerate alot of abuse too. Some sites I've been on have said, 4wd is the only ones that got Cast Iron units, and ALL the 2wd units are Aluminum. But, you'd be the second one I've heard of with a Cast Iron Unit. You've probably just nailed the RPO code debate. I was thinking the MY6 was 2wd, and the MM7 was 4wd, but if yours is a 2wd MM7, then I'd say that's probably the deal right there. I'd actually like to find a 2wd unit too, and now knowing for sure it's availalbe in Cast Iron, I'd prefer that one. But I'd damn sure run either one.

Thanks for the feedback Jeff. So you're saying it don't like to be speed shifted? And the towing in OD, I wonder that's any better and would take some strain off the countershaft with lower gears. With 3.08 gears, I doubt you have the need for OD while towing anyway, but it would be nice to know if you had 4.10's how the counter gear would hold up.

So this brings me to other questions. I understand the 2wd aluminum versions are Chevy bell housing bolt pattern and the 4wd unit are the Dodge bell housing bolt pattern. So does Billy's cast iron 2wd unit have the Dodge bell housing pattern or the Chevy bell housing bolt pattern.

 

[BillyP]

I got the cab off of the truck yesterday, I can snap some pics of it.

 

[HotRodPC]

Oh yeah, that would be good porn. Be sure to include the bell housing too. So far all I get to do with mine, is drop the tailgate, sit down and talk to mine and rub on it and massage it. Still need hydro clutch pedal assembly, slave, master and throwout bearing. I think I want to go ahead and get a new clutch and pressure plate too.

You know according to the 87 GM R/V service manual, the A833 gets an inch bigger clutch than the SM465. Splines are the same but the disk and pressure plate are an inch bigger. Should have better holding power and also last longer.

 

[BillyP]

I'm pretty sure it's cast, the bell housing is definately aluminum as it is shiny compared to the tranny. I should have them this afternoon

 

[Tyger13us]

Yours is a Cast Iron 2wd Unit Billy? I've heard the Cast Iron units are stronger. But I've heard the aluminum ones tolerate alot of abuse too. Some sites I've been on have said, 4wd is the only ones that got Cast Iron units, and ALL the 2wd units are Aluminum. But, you'd be the second one I've heard of with a Cast Iron Unit. You've probably just nailed the RPO code debate. I was thinking the MY6 was 2wd, and the MM7 was 4wd, but if yours is a 2wd MM7, then I'd say that's probably the deal right there. I'd actually like to find a 2wd unit too, and now knowing for sure it's availalbe in Cast Iron, I'd prefer that one. But I'd damn sure run either one.

Thanks for the feedback Jeff. So you're saying it don't like to be speed shifted? And the towing in OD, I wonder that's any better and would take some strain off the countershaft with lower gears. With 3.08 gears, I doubt you have the need for OD while towing anyway, but it would be nice to know if you had 4.10's how the counter gear would hold up.

So this brings me to other questions. I understand the 2wd aluminum versions are Chevy bell housing bolt pattern and the 4wd unit are the Dodge bell housing bolt pattern. So does Billy's cast iron 2wd unit have the Dodge bell housing pattern or the Chevy bell housing bolt pattern.

the load on the over drive main gear will be really high,, and its a tiny lil gear also,, so i would imagine with 4.10's and big tires 33's and HP would put the same load on the gears..

cant find the broken one,, i know i got it someplace,, all the teeth were busted off but here is a pic of a good one i yarded out broken cast iron case my6/my7 which ever it is,,along with the cluster but it did come out of a dodge 2wd,, i put the new gear i got from gm in the trans and i have a spare just in case........

the one i have/trans came out of a BB c10 with 3.73's and nailin OD did it in and it looked like to me that it was used to tow in OD also.......

to me it seems to be the weakest link in this type of trans,, but 1th-3rd it seems to be bullet proof........ and cruse in OD...

I could be wrong? i have been before,, but i think the difference between the my6 is aluminum and my7 is cast?........ as to which is stronger,, your guess is as good as mine.......

I do know that 82-83 did come factory with the my6 special order....

hope this helps.......

 

[BillyP]

Sorry it took so long to get the pics, but here they are.

Cast iron, with an aluminum bellhousing, go figure that.

 

[Tyger13us]

I need a better pic's of the bolt pattern of the trans where it bolt to the bell housing if ya dont mind sir........

I will take some pics of mine in the a.m. for comparison,, but mine is a my6 aluminum...

and im also looking at the bolt pattern on how the tail shaft bolt on,, just for reference mind you.......

looks like your revers lite is on the shifter,, mine is on the dr side of the case/rear and screws in......

 

[HotRodPC]

Thanks for the pics Billy. I have a funny feeling that was originally a 4x4 unit and then someone swapped the 2x4 aluminum tailshaft housing on it. That's exactly that my gear box looks like.

Be back in a minute Jeff, I think I have a pics of the bolt pattern. The cast iron models DO get the Dodge pattern and the Aluminum one get the Chevy pattern the way I understand it, so it does come in 2 different bolt pattern to the bell housing.

 

[Tyger13us]

Thanks for the pics Billy. I have a funny feeling that was originally a 4x4 unit and then someone swapped the 2x4 aluminum tailshaft housing on it. That's exactly that my gear box looks like.

Be back in a minute Jeff, I think I have a pics of the bolt pattern. The cast iron models DO get the Dodge pattern and the Aluminum one get the Chevy pattern the way I understand it, so it does come in 2 different bolt pattern to the bell housing.

thats what it looks like to me is a dodge cast case to a chevy bell housing...

i will be back,, gonna go crawl under for a few pic's........

 

[HotRodPC]

Here are pics of my Cast Iron Trans and Aluminum Bell Housing. The bell housing came off an 87 K10 that had a SM465 and the guy converted it to NV4500, so the dual pattern bell housing is out there. If I had to guess, probably in the 83 and later trucks with Hydro clutch, but there is such thing as a Z bar manual linkage dual pattern bell housing too. I've got a pic of it posted in this thread too.

 

[HotRodPC]

Here are what the tailshaft looks like the 4x4 model. The tailshaft is actually the transfer case adapter too all built into 1 piece.

 

[HotRodPC]

Thanks for posting this up. I might even need a better close up of the gear shift linkage. The dipshit I got the trans from had put the linkage on way wrong. He didn't realize this til I told him the trans was jambed up. Then he says, the linkage might not be right cuz I took it off. So I disconneted the linkage rods to test the trans when I bought it, knowing I'd have to rework the linkage. Notice my linkage is way different than yours. And yours was working just the way you have it pictured right???

The other thing that makes me think yours is from a salvage yard, is the writing on the top of the gear box where someone marked it in yellow opaque paint. Common to be done in salvage yards.