A230 decoding

[m jocko]

Trying to determine exactly which a230 I've got in my 63 Valiant. The previous owner told me he swapped it for a newer synchro model but I got no more info that that. Below are all the codes I can find on the housing:
C11642K on casting
PP2303397 on id plate
Other side of housing are two numbers but I don't know what they are for: 3515758 and 05305
Also a tag screwed on: 10 + 28 (maybe 38, its pretty rusted over)

I want to know so I can be sure I'm buying the correct output seal. Rockauto shows several spline counts and a short or long extention option. But since I don't know exactly what year this trans is I'm kind of guessing at 1973. I'm also curious to know my gear ratios since there are a lot of variants. Its a turbocharged 170 and 1st gear feels kind of high off the line but it works out well once I get the motor spun up.

Any help would be greatly appreciated!

 

[m jocko]

Just crawled under again and wirebrushed some more, I'm pretty certain it is 10 + 28. And the mystery numbers are actually on the plate where the shift linkage goes through, not on the housing itself.

 

[townsend]

Date code 3397 translates to November 15,1970 which would be a 1971 model year.

 

[m jocko]

Thanks @townsend that helps. Went for a drive and by matching the speedo and tach I get 2.875:1 (1st) and 1.643:1 (2nd). Considering the accuracy of my measurement method this seems like its probably 3.08/1.7

Rockauto lists a Timken output seal (7300S) that shows applicable to the A230 in Plymouths from 1964-1987 so I'm gonna go with that one.

If anyone has more info on decoding these numbers I'm still curious but at least I got my seal ordered

 

[Vaanth]

Trying to determine exactly which a230 I've got in my 63 Valiant. The previous owner told me he swapped it for a newer synchro model but I got no more info that that. Below are all the codes I can find on the housing:
C11642K on casting
PP2303397 on id plate
Other side of housing are two numbers but I don't know what they are for: 3515758 and 05305
Also a tag screwed on: 10 + 28 (maybe 38, its pretty rusted over)

I want to know so I can be sure I'm buying the correct output seal. Rockauto shows several spline counts and a short or long extention option. But since I don't know exactly what year this trans is I'm kind of guessing at 1973. I'm also curious to know my gear ratios since there are a lot of variants. Its a turbocharged 170 and 1st gear feels kind of high off the line but it works out well once I get the motor spun up.

Any help would be greatly appreciated!

The described transmission sounds like a 1971 A230 A-body unit with the 3.08:1 first gear.

PP2303397 on the transmission denotes the following:

- PP: Chrysler transmission assembly plant, New Process Gear Division, Syracuse, NY
- 230: A-230 3-speed transmission, fully synchronized in all forward gears
- 3397: Date of assembly: Sunday, November 15, 1970

Usually, a separate set of four digits follow these numbers which indicate the number order of transmission built on that day. A partial VIN is stamped above these numbers for passenger cars. If the transmission is a service replacement or from a truck, it will not have the partial VIN. The following image shows an example A230 identification pad with VIN:

C11642K is the main housing casting number for a 1970 or 1971 A230 to ~11/29/1971. Casting number C-99224-2 (where -2 could vary) was used afterward.

3515758 is the side cover casting number for an A230. 05305 is the foundry reference. A date marking for the cover casting should accompany this numbers similar to the one shown in the following image:

This is a 1971 model year A230 transmission from the stamped and cast markings. Further identity for the unit part number which would distinguish the application and gear set was with paint markings.

Gear ratios vary depending on the application as follows:

198, 225, and 318:
1st: 3.08
2nd: 1.7
3rd: 1.0
Reverse: 2.9

340, 360, 383, and 400:
1st: 2.55
2nd: 1.49
3rd: 1.0
Reverse: 3.34

These transmissions were available in A-bodies, B-bodies, E-bodies, F-bodies, light trucks, and B-series vans. For all applications except A-body and F-body, a long extension housing with two shifter mounts was used. The A-body and F-body application used a short extension housing with one shifter mount. The short extension housing casting number is 3410274 for the A-body. The following image shows the short extension housing on an A230 transmission:

The overall length of the A-body A230 plus bellhousing from the front mounting face to the rear face of the extension housing is the same as the A904 automatic transmission at 30.58 inches.

The A-body A230 output tailshaft spline count is the same as the A904 automatic at 26 splines and uses the same seal.

---

 

[m jocko]

Wow, thanks for al the detail @Vaanth ! From what you stated above, I've got a unit out of a truck or a service replacement because there are definitely no VIN numbers (see pic). I measured the bell housing to end of extension and get about 27.3 inches. Is your 30.5 inch number for the long extension? Assuming I've got a short, it must be a service replacement then. I assume that means the factory built this unit in 1970 but never installed it in a car. Instead they put it on the shelf, and then sold it to a dealer or repair shop sometime later.

I love this website, so much knowledge out there! And no where else to find it for people like my son and I who are still "learning by doing."

 

[Vaanth]

Wow, thanks for al the detail @Vaanth ! From what you stated above, I've got a unit out of a truck or a service replacement because there are definitely no VIN numbers (see pic). I measured the bell housing to end of extension and get about 27.3 inches. Is your 30.5 inch number for the long extension?

The 30.58" is for the short extension on the A-body (or F-body) transmission. The following image shows the manual transmission dimensions from Chrysler:

 

[m jocko]

Just remeasured and I got a long ext (34.4 for dim D). I was measuring from the front of the trans, not the bell housing and if i do some math I can see the 27.x I was getting. Mystery solved.
Now I'm not sure which rear seal to buy again. The Timken 7300S is listed as applicable to the "A230, 30 spline, short shaft." Just looking at the pics, there is a "8160" style that looks different than what I have and they all say for 23 splines so I must not have that. Then there's a "long boot" style which both look what I have with a long rubber boot sticking out tail. It looks like the 2506 is for 26 splines and the 7300 is for 30 splines. Is that the number of splines on the driveshaft interface? Is there a way to tell what I have without pulling the driveshaft and counting?

 

[Vaanth]

Just remeasured and I got a long ext (34.4 for dim D). I was measuring from the front of the trans, not the bell housing and if i do some math I can see the 27.x I was getting. Mystery solved.
Now I'm not sure which rear seal to buy again. The Timken 7300S is listed as applicable to the "A230, 30 spline, short shaft." Just looking at the pics, there is a "8160" style that looks different than what I have and they all say for 23 splines so I must not have that. Then there's a "long boot" style which both look what I have with a long rubber boot sticking out tail. It looks like the 2506 is for 26 splines and the 7300 is for 30 splines. Is that the number of splines on the driveshaft interface? Is there a way to tell what I have without pulling the driveshaft and counting?

34.4" indicates the long extension shaft transmission for B- or E- bodies, or trucks/vans. This length is the same as the A727 automatic transmission and the long extension shaft A833 4-speed transmission. All of these with a slip yoke employ the same output shaft seal and have 30 splines on the output shaft. The spline count is for the engagement of the output shaft to the slip yoke.

The original Chrysler seal part number is 2400300, which is a booted seal. Part number 2400300 crosses to Timken 7300S.

The booted seal and non-booted seal for the same transmission have the same yoke to transmission sealing surfaces. The boot is a dust seal/protection for the area of the yoke that moves in and out of the main seal. The booted version is preferred, but if not available, the non-booted seal works for the primary function.

 

[m jocko]

Thanks @Vaanth!