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Ford Diffs


Brewster

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Hi Guys,

 

I'm in the process of swapping out the diff on my Mega S2000. I was told I had a Sierra 7" diff case so when a rebuilt one with a Quaife appeared for sale on here I thought it would be an easy swap rather than waiting for mine to be rebuilt.

 

Putting aside the fact that getting to it was a nightmare I finally have my diff out on the workshop floor and it's slightly different to the replacement I bought. I'm now thinking the original diff must be a 7&1/2" casing, but I know very little about these. I've attached some photos. Original diff is on the right and new replacement on the left.

 

So, a couple of questions;

 

1) Are they different differential casings?

2) It looks like I can make the replacement fit just using some packings between the diff and the mounts. Is this possible and if so is it a bad idea?

 

Cheers,

 

Brewster

 

IMG_3907.jpeg

IMG_3908.jpeg

IMG_3909.jpeg

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Steve (sdh2903)

Will be fine. If using a 7" diff you need a spacer or washers at the upper left mount like in the pic below. It's across that point where the casings are measured. difffixed.jpg.d8843aa94e98e5cddf48f1aaed2d2869.jpg

 

 

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Cheers. Looks like I need a long bolt or bit of stud for the top too. Anyone know someone who supplies new?

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Sorted! Didn't think to ask the parts dept, but called them and they had the stud and spacer on the shelf. Hopefully winging their way to me tomorrow.

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Steve (sdh2903)

Sounds like your sorted now but Theres also the option to helicoil the diff and just use 4 m12 bolts aswell. Makes it easier for removal/refit. 

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Ah! I didn't think of that. I don't have a helicoil set that large, but if I struggle getting the stud in (brake pipes in the way and I hate hydraulics so avoid splitting and nearly all costs) then I might look at going that way. I guess I'd still need the spacer though. I'm just a bit nervous given the twisting forces going through it and the strength of helicoils and a stack of washers.

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I was also advised here on the Forum, to put the helicoils (M12x1,75 exatctly - on ebay etc ) in the diff mounting holes  . I was just yestarday removing the differential the second time. A lot easier with helicoils in the diff and 4 bolts , than first time with 2 long studs. 

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Have you checked the driveshafts will bolt up ok?

 

7 1/2 inch diffs usually have a bigger lobro,108mm diameter iirc🤔

 

7 inch diffs use a 100mm diameter

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Ian Kinder (Bagpuss) - Joint Peak District AO
17 minutes ago, CosKev said:

Have you checked the driveshafts will bolt up ok?

 

7 1/2 inch diffs usually have a bigger lobro,108mm PCD iirc🤔

 

7 inch diffs use a 100mm PCD

A quick PS, suggests he should be okay!

 

image.png.52f817b36f5ec751f95d6aff4c2f53e0.png

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My 7 inch diff has a flange diameter of 98mm and PCD of 85mm

 

Steve

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1 hour ago, Steve20 said:

My 7 inch diff has a flange diameter of 98mm and PCD of 85mm

 

Steve

Yeah diameter sorry,not PCD🤦‍♂️

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Seems like a few people have gone the helicoil route then. I guess I'm just worried with all the torque of the car being applied against 4 helicoils. Mind you, it's only a VTEC. Could just tie-wrap it in.

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Steve (sdh2903)

I actually think it's a better way of mounting as your actually using the diff in a stressed mount rather than just hanging it on the studs and squeezing it between the mounts. 

 

Ah its a honda engine. Maybe just velcro will do :ph34r:

  • Haha 2
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Terry Everall - WSCC Competition Secretary

Helicoil is the best route and will take all the power you have!!

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