68-69 B body info needed...
I don't believe a 69 RR could be had with a 7.25 or 8.25 rear end.
8.25 was not available for any model in 69
You are partially right here.
To simplify things, all cars '66 and newer factory built with an engine 440 or 440 6 pack or Hemi and a 4 speed got a Dana 60 as standard equipment. If the car was an automatic with any of these engines, then an 8 3/4 was standard and the Dana 60 was optional.
Roadrunners (RM) came standard with a 383 H.P. engine and they had an 8 3/4 rear end in them regardless if they were auto or 4 speed.
You could not get a 7 1/4 or 8 1/4 rear end in a Roadrunner.
Belvederes and Satellites were the ones equipped with those rear ends if they were small block or slant 6 powered.
And BTW, 1969 was the first year for the 8 1/4 rear end in the B-Body line up.
Some examples of cars that I or my family have owned (or still own) are:
I have 4 '69 Coronet 4 doors, (all 318 automatics) 2 of them are 8 3/4s, one is a 7 1/4, one is a 8 1/4.
One '69 Coronet 2 door that was 318 automatic and it has an 8 3/4 in it.
One '68 Coronet 4 door slant 6 3 in the tree had an 8 3/4 in it.
2 '68 Coronet 2 doors 318 autos had 8 3/4s in them.
3 '69 Super Bees 383 Magnum one auto and two 4 speeds al had an 8 3/4 in them.
One '69 Super Bee A12 440 Six Pack 4 speed had a 4:10 Dana 60 in it.
One '69 Coronet R/T 440 4 barrel 4 speed had a 3:54 Dana 60 in it.
One '68 GTX 440 4 barrel 4 speed had a 3:54 Dana 60 in it.
One '68 Satellite 2 door 318 auto had an 8 3/4 in it.
One '70 Super Bird 440 4 barrel auto had an 8 3/4 in it.
One '70 Challenger R/T 440 Six Pack auto had a 4:10 Dana 60 in it.
One '71 Challenger R/T 383 auto had an 8 3/4 in it.
One '71 Charger R/T 426 Hemi 4 speed had a 4:10 Dana 60 in it.
2 '69 Coronet R/Ts 440 4 barrel autos had 8 3/4s in them.
Most of these cars are long gone now.
This just scratches the surface, but you all get the point I hope............
