How can I tell what I have A-904 or A-999? Can I convert a A-904 to an A-999? How is it done?

bwhitejr

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'72 Duster (Performance 360)
'83 Ramcharger (Performance 318)
'80 TrailDuster (360)
'80 D-150 Truck (See Below)
CompCams 252S, Holley 390cfm, Offy manifold
Ported, Polished and Gasket Matched
P4286813 Springs,0.040 Overbore,
0.090 Shaved Head

The only way, I know of, without opening up the trans, is to get the numbers off the trans pan rail, and decode them. You cannot convert a A-904G to an A-999G. Most parts from the 999 will go into the 904 case, but the 999 uses a double wrap rear band. This required a different anchor in the case. The cases are different. I don't know if there was ever a A-999G trans. Maybe in the trucks, or "fleet" vehicles. (Anyone know about this?). Most six cylinder "heavy duty" applications got the 727 trans. The 999 was for 360 engines.

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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

OK. Here is the dilemma. I have a free A-904 for a small block (don't know whether it is an A-999 or A-904) I am going to put a 360 performance street/strip motor in a 72 Duster. Would I find it easier for bolt-up and performance with a rebuilt A-904 or get a A-727 and rebuild it?

bwhitejr

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'72 Duster (Performance 360)
'83 Ramcharger (Performance 318)
'80 TrailDuster (360)
'80 D-150 Truck (See Below)
CompCams 252S, Holley 390cfm, Offy manifold
Ported, Polished and Gasket Matched
P4286813 Springs,0.040 Overbore,
0.090 Shaved Head

This is what I would do, if it were me. I can do my own trans work, so this makes sense for me. Take the "904 apart, and see how many clutches are in the clutch packs. If the front clutch has 5 friction discs, just rebuild the trans and use it. If it does not have five frictions, get a A-999LA from a 360 engine in a salvage yard, and rebuild that. I would not use a 727, except on a big block, or a truck that see's heavy hauling. PS: make sure you use a 360 converter, with a 360 engine.

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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