What A-833 is this?

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ValiantKindOfGuy

ValiantKindOfGuy

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What am I looking at here? True 4 speed or overdrive unit?

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Post a clear photo of all the numbers on the flat pad at upper right as well as the tail shaft from the opposite side.
 
the aluminum ones are 26 spline output and the cast are 30 spline output.

The only time the aluminum was used was in light cars like the aspen/volare and Late A.

Any truck or van or 75 and 76 A/F were cast. So the vast majority of them out there are cast. Cast iron cases used 99129 part number which is the same number used on the earlier close ratio cases.
 
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I have one of each that belongs to a friend of mine, the aluminum is a 26 spline and the cast is a 30 spline output, from what I understand the cast ones are a lot stronger in general.
 
Dfr360cuda said:
One shift lever up
The other one down
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I have to disagree with that not that it's not true in a real Overdrive but for goodness sakes don't let somebody just flipped the third fourth leave her over on an overdrive and tell you it's a regular for Speed..
 
The input shaft retainer is usually larger on an Overdrive. A measurement of that is I could tell tale sign.. if you're paying good money for it I would want to open the side case. It's only 10 bolts and it pops off easy. If the gears progressively get smaller then it is a 4-speed. If one of the middle years is way larger and it doesn't get smaller to larger evenly across the gears it's an Overdrive.. besides that you want to look inside of it and make sure it's all clean and oily and not Rusty and been sitting around...
 
j par said:
Honestly if he's sending you these vague pictures of numbers and not the whole transmission and the front of it and everything like that I would be leery...
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I’m just looking for what it is. Is it an A Body? Is it an overdrive(unlikely) it’s a 3 hour drive and the guy got it in an estate sale he has no idea exactly what it is. I’ve been looking for one for my 4 speed swap and this one is cheap.
 
j par said:
I have to disagree with that not that it's not true in a real Overdrive but for goodness sakes don't let somebody just flipped the third fourth leave her over on an overdrive and tell you it's a regular for Speed..
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Yep, I didn't think of that.
I assumed everyone was honest.
I have the Passon transmission book out in the garage.
 
Rainy Day Auto said:
the aluminum ones are 26 spline output and the cast are 30 spline output.

The only time the aluminum was used was in light cars like the aspen/volare and Late A.

Any truck or van or 75 and 76 A/F were cast. So the vast majority of them out there are cast. Cast iron cases used 99129 part number which is the same number used on the earlier close ratio cases.
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I thought the Plymouth Feather Duster and Dodge Dart Lite models all had an aluminum overdrive to save weight for better fuel mileage?
 
What about shift the gears.
Turn the input shaft, watch the output shaft.
Count the number of revs going in to what's coming out.
 
66340SEDAN said:
I thought the Plymouth Feather Duster and Dodge Dart Lite models all had an aluminum overdrive to save weight for better fuel mileage?
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Every 75 and 76 OD I have ever had were cast iron. I was under the impression they only made cast iron in those years. I did have an aluminum unit but it was a 1978. So I would say they were cast.
 
Rainy Day Auto said:
Every 75 and 76 OD I have ever had were cast iron. I was under the impression they only made cast iron in those years. I did have an aluminum unit but it was a 1978. So I would say they were cast.
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I just read:
Chrysler’s full-size and mid-size 1963 models were the first to feature an available four-speed transmission. The 318, 361 and 383 V-8 engines used the familiar Borg-Warner T-10 four-speed that year; however, the New Process A-833 four-speed transmission was developed for Chrysler soon afterward. The A-833 was built at New Process’s Syracuse, New York, plant and rolled out in the 1964 models. Its production continued until the mid-1980s. All early versions of the A-833 were made with a cast-iron case. Aluminum-cased units were used on the A-833 overdrive version, which began in 1975. Because the cast-iron units were much more rugged, these are the most sought-after replacements for four-speed transmission conversions.

The A-833 was reconfigured as an overdrive transmission using an aluminum case in 1975 and was used in Chrysler cars and trucks for added fuel economy. The overdrive version of the transmission reduced the third gear ratio to .73:1 to be used as the overdrive, and the 1:1 fourth gear became third.

The overdrive configuration with a 23-spline input appeared in these vehicles:
• 1975 to 1979 Valiant, Duster, Dart, Scamp, Swinger, Volare and Aspen (3.09:1 ratio first gear)
• 1975 to 1987 Dodge light-duty pickups and Dodge and Plymouth vans (3.09:1 ratio first gear)
• 1977 to 1979 Diplomat and LeBaron (3.09:1 ratio first gear)
 
From Brewer's...…..
Extension housing casting number C-99126 for 1969-71 A-body transmissions with 30 spline output/307 bearing. Baked and shot blasted.
 
Daves69 said:
From Brewer's...…..
Extension housing casting number C-99126 for 1969-71 A-body transmissions with 30 spline output/307 bearing. Baked and shot blasted.
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We are here to educate!
 
I put a 1968 A833 four speed guts in an alum. OD case. Had to mill bellhousing for larger front bearing and put new larger front bearing up front.Drove it for years. Still have it.
 
Kendog 170 said:
I put a 1968 A833 four speed guts in an alum. OD case. Had to mill bellhousing for larger front bearing and put new larger front bearing up front.....
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Did you install bushings in the case or run the shaft in the aluminum?
 
I'm keeping it. I may install in my Ragtop in the future. Can't remember installing bushings in the case but my buddy ( He was a Mopar Guru to me back then ) did most of the work for me . I didn't have any experience back then. I would be willing to do it myself today with the knowledge I have now. I'd like to find an Aluminium tail shaft housing for it as it has the iron one in it now now. I do have a OD aluminium trans. in pieces I scored from a junk yard 30 years ago and a aluminium bell-housing that would need milling but it's buried for two years as I sold my house and going to move south in a couple of years. All my garage contents and car parts are stored in a tractor trailer 28' box.I miss my Garage

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