Hi,
Dumb question here - are there different versions of the A904 for V8 and /6, or are they physically interchangeable? Thanks in advance,
Bill
Hillsboro, OR

They are different. The case won't interchange, and there are differences internally as well. The internals will interchange in the different cases, but correct output shaft length, and differences between the early and the late transmissions make it so some parts can't be interchanged across the years.

CJ

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Part of Tyrde-Browne Racing

The bolt pattern is different

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V8?? We don't need no stink'n V8!!

That's helpful, thanks! One more question - my car is a '68 Dart /6 car, would a '75 Dart /6 904 be easily swapped (no mod's), or am I better off rebuilding the '68 unit?

If your engine is a 1968 and newer, or equipped with a large end crank shaft it will bolt right up to the later transmission. If by chance your engine has an early, 67 and older stile crank, you will need to locate a bushing to make it compatible with a later transmission.

You may need to change out the reverse lock-out switch from the single contact type to the later three contact switch. I don’t know which year, 68 or 69, the switch was changed to the new type. Someone will chime in on this point, and set me straight. Either way, it is a simple swap-out to install a switch compatible with your wiring harness.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Great info, thanks for the help guys!

Bill, Need to correct a couple of points
The 67 and earlier crank does NOT use the bushing to allow the later trans. It is the other way around, the 68 and later crank uses the bushing to allow the early trans. To use the late trans with the early crank, requires a custom torque converter.
Also you cannot just swap the neutral safety switch from the single wire to the three wire. The actuater inside the trans is different. I THINK you can change the actuater on the valve body and use the later switch (3 wire) in place of the earlier switch (1 wire), but I am not positive.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

B5cuda, disregard what I stated previously; apparently it was all bunk, sorry for the misinfo.

Thanks for the clarification Charrlie. I always get the crank & converter sizes crossed in my head. As for the switch I did not realize that the actuator in behind it was different.

I Don’t recall changing the actuator when I went from reverse manual valve body to normal automatic type in my 77 trans with 67 single conductor switch. Someone must have all ready made the change.

I’ll have to repeat a semester at Tranny U…

Bill

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Bill, Like I said, I am not positive about the switch. I know the Actuater is different, but it might still work for the neutral start, but probably not for the backup lites. I need to look inside of a trans to verify.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

No harm done, I'm still in the planning stage. Guys, thanks for the education! My "new" car is a '68 Dart that I'm told has a '75 engine transplanted in, but evidently the original tranny (haven't crawled under yet to check). It drives, but tranny slips very badly and the fluid looks burned. The car has an early build date (Oct. 11) so that makes me wonder whether the trans was set up for the older, smaller crank - and the mismatch killed it? Either way, it needs a new or rebuilt tranny at this point. I'm thinking this car is a good candidate for a later A904 or even A999. I'm on the west coast so think I'll start scouting junkyards. Will let you know how it comes out.

Charrlie, I’m the one in the fog, you are probably correct. My 67 has the back-up light switch mounted on the consol shifter mechanism. So most likely dumb luck worked its magic on my valve body change.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

It's possible that a mismatched converter is responsible for the slippage and so forth, but more likely a problem with the Throttle Valve adjustment.
Most of the time when one of these transmissions goes south and makes stinky brown fluid, the linkage that goes from the throttle lever on the carburetor down to the transmission isn't working correctly.

Absolutely, check to make sure the converter fits the crank pocket, but also make certain your new transmission's kickdown linkage, or throttle valve, is adjusted properly.
An incorrectly set up kickdown can waste a new transmission real quick.

CJ

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Part of Tyrde-Browne Racing

Great reminder, appreciate that!