its a 727, right?

[KramerSwinger70]

quickquestion to verify. my uncle has an all orignal 73 charger w/ a 400 4 barrel w/ an automatic. hes the 2nd owner, but has had it since 73. anyway, with the 400 BB, he must have a 727 not a 904, correct? just double checking. and he would have an 8 3/4 rear as well? what kinda of gear ratio would he expect to have?

thanks

 

[Darter6]

Yes on the tranny, Iffy on the rear but with Mopar never say never. Tell him to look under it, if it has a bolt on rear cover, 99% sure it's a 8 1/4.

 

[70aarcuda]

no 904 were ever made to fit BB,,,so all BB will have 727.

 

[leroymoparrr]

Alot of the rear ends had a steel tag with the stamping number.Is it a posi ? I,m saying it would be a 323.

 

[67Dart273]

904/ 727 is easy to ID. Look under the car on the passenger side at the pan. If it's straight sided, it's a 904. If it's got a bulge in the pan, it's a 727

The 727 bulge:

Here's the rear axle chart:

 

[KramerSwinger70]

if hes got 3.23 gears in that thing id b tempted to steal it from hiom. im not sure if hes got SG diff tho, never had a chance to do a burnout personally but im sure he knows. i really oughta post some pics of his car, its amazing haha