Ok here is the scenerio.

My father has a 69 coronet 2 door currently with a 4bbl 318. The rear is a 7-1/4 (I believe, need to double check).

I have a 4 door 69 coronet sunday cruiser with a 318 2bbl, but mine has the 8-3/4 rear.

My father is planning an upgrade to a 440 auto combo, so the 7-1/4 definately will need to be swapped out.

Originally I wanted to do a simple rear end swap with our two cars, but the 7-1/4 makes me a little leery of doing so.

Now, here is my question. We do have a 8-3/4 rear out of a chrysler station wagon that we could use in his coronet, but it will need to be slightly narrowed to stock width.

What kind of a shop will do this? When I call around, general answers are rebuilds, services, etc. But no narrowing really. Where do I need to look for this service? When I call the speed shops, all I get is stuff for "NOSS", big bling rims, low profile tires, and fart pipes for imports.

I wouldn't mind cutting the axles and housing down, but where to go? Or should I just do the swap between the two cars and see what happens?

suggestions, comments, etc?

Thanks in advance

eight

Look around for another B body 8 3/4, they can be bought cheap if you look around.

Since yours is a 2bbl sunday cruiser I'd just swap yours for his. His 7&1/4 will be plenty adequate for what you have. If not Moser in Portland Indiana does narrowing/perch rewelding & maybe some offset rims would let the wagon 8&3/4 fit as is(except for the spring perch width probably needing to be changed). PS a 7&1/4 has 9 bolts(Some later ones MAY have 10) & if it's not a 7&1/4 thats even better

7-1/4 in a B body? I never thought they came that way; (I could be wrong though) I woulda thunk an 8-1/4 would be the "weakest" they'd go there that the 7-1/4 was an "A body thing" in those days.

3 place

doctordiff here on the board

moser enginering

currie enterprize in olando FL

the all can hook you up with narrowing and resplining axle

or custom axle packages

would be easyer to find a housing

I have a couple diff one..how wide you need flange to flange on the housing

trucks are same as c-bodys

and there are early B-body and later b-body housing and station wagons

along with e-body which may fit

I am willing to bet you gots an 8 3/8 thats called an 8 1/4 most times

9 bolt in cover for 7 1/4
10 bolts on cover for 8 3/8 called 8 1/4
12 bolts on cover for 9 1/4 and cover is octogone shaped
12 bolt on cover D-60

I looked under the car yesterday after work, it appears to be an 8-1/4.

I doubt this is stock for this car but who knows?

Anyway, this should be sufficient for my 2bbl 318 sunday cruiser.

We'll see how it turns out

eight

yes it would be stock for it

yes they would swap out and be fine

they 8 3/4 would be the one for a 440

so thats a good swap IMO

that 8 3/8 will hold up just fine with the 318 cruzer

you can beef it some with gears and a suregrip unit also

The rear in the car is an 8 1/4, not 8 3/8- thats a later truck rear, since it's a 69 I would look for an 8.75 because you will need it anyways if anything fails in the 8.25 because there is nothing available for it 69-71 or so are different internally from the later ones and parts don't swap.

I found this out years ago with a 70 coronet I was working on, it was some highway special with a 383/727 and 2.76's in an 8.25, I was trying to help the guy build it on a budget and gave him the 3.55 sure grip out of my '73 Duster to swap in and it wasn't close to working.

If a stout 440 is going in I would skip the 8.75 and go with a Dana, it's stronger and about 1/2 the price of 8.75 stuff anymore.

A 1969 "B" body never came with a 7 1/4 rear. The 7 1/4 rear was strictly an "A" body rear The difference between a 7 1/4 and an 8 1/4 rear is easy to see. The 7 1/4 axles are held in by the 5 bolts on the brake backing plate, just like the 8 3/4 rear. The 8 1/4 rear axles are held in by "C" clips inside the rear end housing.

I am sure that you realize an 8 3/4 rear is the "ham" rear, all other mopar rears have a back cover.

yes, i realize the 8-3/4 does not have a rear cover. I have rebuilt several.

my main question was about the other rear end and if it would work, I am not that familiar with the 8-1/4. I've learned a lot today, thats for sure.

If I ever come across an 8-3/4, I would swap that in a heartbeat, but for the time being and money being tight, I am looking for the cheapest option for the time being.

thanks!

eight

didnt yours have an 8 3/4 and you are swaping your dad for the 8 1/4?

it would be fine and a bolt in swap if so

dont sweat it

first year of the 8.25 was '69, IIRC....