Going to look at an 8" rear with a Limited Slip tomorrow. The guy tells me its out of a late 60s Granada and he was going to put it in his 68 mustang however he had a 9" fall into his lap so he went with that. Everything was at his place except for the center pumpkin which he picked up from his buddies place today. He offered the whole thing to me for 150.00.

The problem is I really don't know what I'm looking at or for. Anything you can tell me to look for or beware of?

Nothing is wrong with the 8" rear in our 67 however I really want to add a LSD which is why I'm going to look at this one. Figured for the price I had to go look. I'm guessing that I will not be able to just swap out the pumpkin centers but instead have to swap the rear ends correct? Any fit issues I should be aware of?

Thanks for any help on this one!

 

The Granada came out in 1975 so double check his info. if it is a Granada 8" it will have a stronger case. even if the gears and clutches are bad you will be steeling it for $150.00 Assuming it is LS and a Granada

 

Well I went and took a look at it today. Seller said it was from a 77 or 78 Granada which he got for his 68 mustang a while back. Since then he's decided to go with a bigger rear and wasn't using this one anymore. He said he checked their shop software (works at a salvage yard) which showed the 77 / 78 Granada 8" rear should directly fit the 67 / 68 mustangs. Its obviously not been sitting outside as there is no rust on it aside from the standard surface rust on the housing. The 28 spline axles seem to be ok although 1 stud is broken off. Thehousing is in good shape. The main gear ring in the pumpkin is clean and shows no wear, chips or rust.

All in all it appears I got a good deal though I will need to have them looked over to make sure. I took a few measurements after I got it home:

Overall length (end to end): 52 5/8"
Center to Center of mounts: 42 7/8"
Outer edge to Outer edge of mounts: 45 3/8"
Inner edge to Inner edge of mounts: 40 3/8"





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are you sure its a limited slip from the ones i've seen the side don't look right unless they put mini spool in it you mite want to really look closer @ it

 

it is the correct width for a 64.5-66 Mustang but is 2" narrower than the 67-68 rear ends. Also that is not a limited slip diff!! You can tell because the ring gear bolts are not resessed in to the differential. I would assume it has been spooled or it may have been "modified" with extra thrust washers. That will make it act like a limited slip for a wile but is not the best

 

This isn't the end of the world for you.....unless you wanted to use stock wheels. I am putting a 65/6 width 9 inch in my 67...you just have to remember to subtract 1 from any backspacing number you come up with to account for the narrower setup. I am planning on ordering some 17x9.5 for my 67 with 4.5 BS...should make for a nice deep dish look in the rear....the only trick is then to make sure the front won't look silly

Additionally...if all you want is LSD all you have to do is swap pumpkins as long as the new pumpkin is 8 inch and setup for the same splines as what you have in the car now so then you could turn around and sell the housing and axles seperately if you don't use them.

 

Hmm ok well... first bad purchase in this project if this is the case. I was doing really good on my finds. I'm not really concerned with the housing, axles and its fit as I figured it the fitting was off I'd still be ok with what dodgestang said.. simply swap out the pumpkins between this one and our current 8" rear. Both are 28 spline and of course 10 bolt.

Whats concerning me is that your telling me its not LSD! I honestly don't know what to really look for. Anyone have a website with an exploded view or a few pictures of what this should look like?

I'm only a short 40 minute drive from the guys house who sold it to me. Knock knock.... [:@]


PS.. Anyone need a C6? Was just offered a complete 351w from oilpan to carb with a C6 trans for 400.00. I don't want the C6 but would love the 351w. Haven't decided on yet as space and storage right now are an issue.

 

First thing I would do is stick some axles in the diff and spin the pinion if the axles spin opposite directions then it is not a LS if it is a mini spool or an "extra washer" open diff than you would need to pull it apart to tell. I could be mistaken that the bolts should be resesed but I am 100% sure there resesed in a 9" and 99% sure they are resesed in an 8"

 

Daze.. and quesey.. MANY thanks for bringing this to my attention. haven't been able to get out to look at it today but I'll be sure to do that tomorrow. I'll test to see if both axles spin the same. If they don't.. well craps gonna fly when I knock on his door an hour later. If they DO spin in the same direction then I'll look around and take it into a shop for an inspection.

I'm not sure what mini-spools are exactly however I have read that they are NOT for general everyday daily drivers. So if its been spooled I'll be chatting to him also.

Again.. thanks.

 

Going to give you some info you may know some of this but if not then here you go.

A limited slip as you probably now gives power to both wheels on the straight of way but allows the wheels to spin different speeds when cornering so the outside wheel can cover more distance.

A spool replaces the differential and is a solid piece that connects the two axles. Great when launching durring drag racing, but not good for cornering because the wheels need to be traveling at different speeds. You don't have one of these because you could tell by looking at it.

A mini spool fits inside the differential and replaces the spider gears and side gears with a solid piece to connect the two axles together. because it goes inside the differential you cant tell from the out side.

The other thing is a "trick" for making an open diff act like a LS.

Anyone can have Traction (Loc) !

Have you been wanting a Traction-Loc in your 8"-9" differential? Have you found how difficult affordable used ones are getting to find? Then here is a way to turn your peg leg into a two striper.

Remove the differential carrier assembly from the car and remove the side bearing caps. Pull the differential case assembly out of the carrier, remove the ring gear bolts, and tap the ring gear from the case with a soft hammer. You will find 2 counter sunk screws holding the case together, these can be either Phillips slotted or recessed hex screws, remove them.

Once this is accomplished the case can be split in half. You will notice that the two halves have gears in them, three in one side and one in the other. These are the axle side gears (splined internally) and the pinion gears. The case half with one gear requires no further disassembly, the gear in it will lift out. The other case half contains the other axle side gear and both pinion gears held in place by the cross pin. To disassemble this half drive out the 1/8" roll pin that locks the cross pin in place and tap the cross pin out. The pinion gears are now free to remove from the case halves.

This tear down is required to gain access the axle side gears. Lifting out the side gears you will notice that between it's thrust face and the differential case counter bore is a thrust washer, Ford part number C9OZ-4228-A it measures .031 thick. The function of this washer is two fold, it is a hardened surface between the axle gear and differential case to prevent metal galling and, it spaces the axle gears at the proper engagement depth to rotate the pinion gears. By installing two thrust washers on each axle gear instead of one, the gears are moved inboard enough to cause the pinion gear pitch diameters to bind, effectively locking up the differential assembly.

This modification still has the ability of slipping some on turns, but will have a ratchet feel similar to a Detroit locker. The washer trick works equally well on both 8" and 9" rears. I have done several of these for street and strip cars and I believe you will find the results rewarding.

Mike the Radiator Man

I found this trick on line and I do not recommend doing it and if your rear end is set up that way I would not run it.