Sierra Tripod Differential

The Sierra Diff was quite hard to measure and draw up. I started with the push in shaft 7″ ‘Tripod’ version.

Most of the time drawing up this Ford Sierra Differential was taken during the measurement stages. When there are so many dimensions to be taken you almost need a 3D model to plot them on. It’s the whole ‘chicken and the egg’ situation.

To double check the dimensions I drilled some holes piece of MDF, then tested whether bolts passed through them lined up with the diff. Crude, but it did give me some piece of mind as everything seemed to line up just fine.

I have two 7″ differentials, a Tripod type and a Lobro type. It was interesting to note, that although the bolt / mounting points were identical there were a number of shape differences in the casting. Small lumps and bumps, nothing major but you could see that over it’s lifespan Ford like to tweak the design.

For more info on the Scorpio / Granada / Escort / Sierra Diff click here

Rear Suspension

The rear suspension is now taking shape. I was beginning to think that I would never find a Sierra Diff! Nearly a year of surfing and hundreds of bids later, I have a gem of a diff. When I opened it up, there was zero signs of wear and the ...

Sierra 100mm Stub Axle

There is a choice of two sizes for the Ford Sierra Rear Stub Axle : 100mm 108mm For this project I've chosen (read bought) 100mm rear stub Axles (27 spline). Again, I've been lucky and got a pair of brand new Ford Sierra Cosworth Group N stub axles. Another bargain. Luckily, they ...

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Sometimes, when parts arrive, they look too rusty to be of any good. These Ford Granada Rear Hubs were very rusty indeed. Everywhere they stood you'd find a pile of rust flakes. The hub on the left was dunked in the electrolysis bath for 4 hours. Electrolysis strips away rust without ...

Granada Axle Flange

It seems like an endless game, drawing up all these components, but the 5 Stud Granada Rear Axle flange has now been drawn up. These are the 27 spline, 5 x 112mm axle flanges from a 1986 - 1994 Ford Granada / Scorpio. Other vehicles to share the 5 x 112mm stud pattern are: Ford Galaxy Mercedes ...

Locost Push Rod Rear Suspension

I've finally got around to making the Push Rod Rear Suspension. (NB. I'll use lock nuts on final assembly) For some reason, I think it was a lack of threaded inserts, I hadn't made the push rods. This meant that the car could never be put down on it's wheels. ...

Caterham Rear Diff Cover

I've replaced the rear suspension mounts with roller bearings, but in the the process discovered that there was no way to remove the differential. The rear chassis is different to the standard Haynes Roadster as it has much more triangulation. This makes the access to the differential very tight. It ...

Sierra Rear Shafts

How do they measure Sierra Rear Shafts? There are obviously different length versions made, but even ones that appear the same length have subtle differences. Take these two shafts, at first glance they appear very similar. But one uses an both inner and outer split rings(bottom)and the other ...

Kangaloosh

Front suspension design has been complicated by the 4x4 running gear. It quickly became obvious that it would be impossible to use the ubiquitous Ford Mk2 Escort steering rack as it would try to pass straight through the Sierra Front diff. The push rod for the coil-over shock also tried ...

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