1974,1973 roadrunner/satelits

[yannick47]

what rear end did the 1974 roadrunner have?(if thts the wa to ask zee question)::icon_cool:

 

[pabster]

Google "1974 Road Runner". Click Images... look for rear end.

 

[blackblazer717]

Or if its rear axle your refering to, most of them had 8 1/4's

 

[Ralph Cali]

Most of the RR I hav seen have the 8 3/4" for 73 & 74
I had a 318 RR with a 8 3/4 and now a 340 with an 8 3/4
From what i have heard from this website its a pretty stout rear and easily identifiable.
Ralph

 

[jessipup]

The Hamtrammick registry website should have all that info plus much Much more

 

[runner4b5]

Back in 1975 I bought a slightly used 74 400 4 speed that had 8.75 rear with posi with 3.23 gears. Now I have 3 Roadrunners all 400 4 speeds (all matching drivetrains) (373's) 1 1973 Charger Rally 400 4 speeds They all came with either 3.55's or 3.23's, 8.75 489 case. I have since experimented with 4.30's NOT, 391,s and 410,s. I'm pretty sure the ones that got the 8.25 rears were 318's

 

[khaley71]

I parted a 73 RR with a 318 automatic and it had an 8 3/4, but it may have also been installed by a former owner. My 73 HP 400 Satellite has an 8 3/4 with 3.23 open gears

 

[74roadrunner440]

i have a 73,74 rr and both dont have a 83/4 but a 81/4 i belive or 91/4 all i know i wish they had a 8 3/4

 

[moparmarks]

73/4 318 RR would probably have a 8.25 unless optioned with a tow or perforance axle.
in 71 Mopar started putting more 8.25 rears in B-bodies than in earlier cars. Mostly HP cars along with wagons got the 8.75. Not always but mostly. Have had several BB 2-bbl cars with the 8.25 Have a 74 Coronet 400 4-bbl with 8.25 Think most 4-spd cars got the 8.75

 

[moparmarks]

That chart is good to determine what rear you have but it does have a few errors as to their applications.
8.75 was used in B,C, E and 1/2T trucks though 74. In 75 9.25 replaced it.
8.25 was never used in trucks in the 70's. Was 8-3/8"
8.25 started in B's mid 69-up
9.25 started in B's late 73. Both 8.75 and 9.25 were used in 74 B's
7.25 was the only other rear made for the E-body besides the 8.75

 

[Ron 73]

Ok, Help me to understand this a bit better, if the 73-4 came with (usually) the 8.25 or the 8.75 then where did the 9 1/4 come into play, was there particular cars they were made for? Mines a Sat. but, i assumed it came with a 8.25 and found the 9.25, Id like to know if i can, where the 9.25 comes into all this.. anyone? I think someone swapped the original out for the one in it, but maybe im wrong.. going by what im reading though, i makes me think it,, I cant see any real benefit doing it, if that is the case..

 

[moparmarks]

The 9.25 was the new heavy duty rear to replace the 8.75. HP cars and wagons mainly. The 9.25 is a good strong diff, good up-grade from a 8.25

 

[YY1]

Both my 318 Chargers have 8 1/4.
Can't see Plymouths being any different.

Seen a lot of non-perf 67 B bodies with smaller than 8 /3/4.
Most 66 B's seem to have 8 3/4, but not 67.

 

[74roadrunner440]

y do some 340 73 or 74 rrs have 834 then but would like to find a 8.75 for my rr thanks pat

 

[74roadrunner440]

will a 8.75 rear work out of a 72 rr

 

[moparmarks]

71/2 rear will work in a 73/4. If you use the 73/4 isolators you need to drill out the hole in the perches alittle bigger.
Should note that cars optioned with a tow or performance axle got the bigger diff.

 

[Ron 73]

The 9.25 was the new heavy duty rear to replace the 8.75. HP cars and wagons mainly. The 9.25 is a good strong diff, good up-grade from a 8.25

Thanks, that explains why someone did it, i have no idea why some things were done as they were on my car YY1.. Plymouth should be the same as the Charger with what were talking about. But I knew they (9.25 were a decent rear end, hard to find parts for) But i didn't know until now why the time to change it. Heres a picture, i know its the 9.25, old picture but i can get a better one, my fuel tank is out. will the bottom shock mount plate work from a 8.25 to use on a 9.25? Im changing shocks, they all came off good except passenger side, broke nut off flush with the bottom shock stud? Who ever changed all this also put a 727 in it, im sure it came with a 904, its only a 318 car..

 

[YY1]

Looks like you got a sway bar too.

If it's a real RR, it might have come with some HD stuff.

 

[Ron 73]

Yes, Ill tell you what, i read a lot of you and mopar marks comments on these cars and if you guys can help me understand why things are as they are on my car i would appreciate it, everything i see and read does not coincide with how the satty is supposed to be, i admit to knowing little or nothing on these year of cars... the 727, when everything i read says it should be a 904, why? just someone upgrading? the 727 was only supposed to come with a BB, this came with a 318, but i don't know thats true and it did come with the 318. why the 9.25 and rear sway bar, i keep finding things that do not match what should be.. signed.. Corn fused.

At a car show looking under the rear of a 74 RR and no anti sway bar? again confused and just thought of this! Seems to me that is odd!!

 

[Ron 73]

Im sorry, i didnt see the second comment, this says its a satty, ill give you the vin numbers if that will help First 2 are RH, that i remember sitting here..