Identifying 727/904 Transmissions at Junk Yard

[Joshua Montee]

Hi again,

As some of you know from my previous post, I am damn near living at the
junk yard. Anyhow, I am in need of a 904 transmission for my other less
'modified' '72 Sebring. Apparently the people who I had bought it from
thought it was a Dukes of Hazzard car and nearly destroyed some of it's
devices. At any rate, reverse gear is missing. "R" gear is identical
to neutral. I can get a used transmission at the junk yard for $59, but
I need to be able to _know_ its an A-904. I sifted through the
junkyard's heap-o-transmissions, and found what I identified was an
A-904.

I know the shape of the pan needs to be a square with a corner cut off,
but I know there are several other newer transmissions I can get
confused with. Is the A-904 the only tranny with that shape of an oil
pan? Is anyone familiar with the differences between the A-904 and the
A-904LA transmission? And while I'm asking, is the 727 transmission the
only transmission with the "lump" on the front passenger side of the oil
pan?

Thanks a lot fellas, I don't know where I'd be without you guys,
Josh Montee

[John Kunkel]

Joshua Montee wrote:
> I can get a used transmission at the junk yard for $59, but
> I need to be able to _know_ its an A-904. I sifted through the
> junkyard's heap-o-transmissions, and found what I identified was an
> A-904.
>
> I know the shape of the pan needs to be a square with a corner cut off,
> but I know there are several other newer transmissions I can get
> confused with. Is the A-904 the only tranny with that shape of an oil
> pan? Is anyone familiar with the differences between the A-904 and the
> A-904LA transmission?

The A904 family of transmissions also includes the A998 and A999 (later
called the 31RH and 32RH). They all have the square pan with one corner
missing. The major difference is in the bellhousing area, the LA ver-
sion fits all small block V8s and is easy to spot since the starter
hump is more straight off to the side while the slant six version has
the starter mounted high.
For your purposes any of the V8 units will fit, but the later lockup
units aren't compatible with your torque converter. To identify a lock-
up, count the splines on the input shaft. Non lockup units will have
27 splines while the lockups will have 26 splines. Also, the lockup will
have a passage drilled through the center of the input shaft. If a
small wire can be inserted more than an inch into the shaft, it is a
lockup.
The later A500 overdrive units share the A904 pan shape but are easily
identified by their massive rear case and tail housing.
John

[Joshua Montee]

Thanks for the information John. One more thing...are the A998/A999
transmissions as durable as the A904 transmissions? If so, what are the
differences?

Josh

[John Kunkel]

Joshua Montee wrote:
>
> Thanks for the information John. One more thing...are the A998/A999
> transmissions as durable as the A904 transmissions? If so, what are the
> differences?

Actually they're more durable. They were used in 360 and heavy duty 318
passenger car installations. Among other things, they have wider kick-
down bands and extra clutches.
John

[donsea...@gmail.com]

Hi my name is Don s i have a 82 Dodge d150 with slant six 225 c u or 3.7 anyway im trying to identify the tranny i have for sure, i believe its an A- 727 but are there any other models that are 3 spd and would bolt up without driveshaft changes or the like . Im pretty desperate as i am now a foot without my truck.

[BDK]

In article <dab32149-57a1-4bf5...@googlegroups.com>,
donsea...@gmail.com says...

>
> Hi my name is Don s i have a 82 Dodge d150 with slant six 225 c u or 3.7 anyway im trying to identify the tranny i have for sure, i believe its an A- 727 but are there any other models that are 3 spd and would bolt up without driveshaft changes or the like . Im pretty desperate as i am now a foot without my truck.

From some forum:

http://www.forbbodiesonly.com/moparforum/threads/your-guide-to-the-727-
904-transmission.17287/