Reconditioned Differential Purchased
(04/12/2006)
I couldn't resist it. A shiny freshly reconditioned 3.92 7 inch open differential on eBay for next to no money. I bought it! However I then realised I had caused myself a bit of a problem. The Avon is designed to use a 7 inch differential from the back of a standard Sierra, as opposed to its bigger 7.5 inch cousin from the Cosworths and XR4's. I double checked this and it was indeed a 7 inch differential, what I forgot to check was that there were two type of 7 inch diff's. The older type had had push in inner drive shaft half shafts, the later version had a more modern bolt on sealed CV joint, that was secured to the diff with small hex bolts.
Speaking with Paul at Tiger enlightened me as to why this would be a problem. The bolt on driveshafts were thicker at the wheel end than the older units, this would cause a problem when the drive shaft tried to pass through the Tiger fashioned hub carrier. Drat!
He said it would be possible to machine the ends of the drive shaft to pass through the carrier, but this was all turning out to be extra hassle I hadn't originally envisaged. I still planned to get a donor pack from Tiger at a later stage which included the complete rear differential assembly, I was always going to use this as a spare and recondition it, but it looks like I would have to promote it to being the main component in the build.
I guess at some later stage I will have to purchase matching driveshafts and hubs to go with this differential.
I couldn't resist it. A shiny freshly reconditioned 3.92 7 inch open differential on eBay for next to no money. I bought it! However I then realised I had caused myself a bit of a problem. The Avon is designed to use a 7 inch differential from the back of a standard Sierra, as opposed to its bigger 7.5 inch cousin from the Cosworths and XR4's. I double checked this and it was indeed a 7 inch differential, what I forgot to check was that there were two type of 7 inch diff's. The older type had had push in inner drive shaft half shafts, the later version had a more modern bolt on sealed CV joint, that was secured to the diff with small hex bolts.
Speaking with Paul at Tiger enlightened me as to why this would be a problem. The bolt on driveshafts were thicker at the wheel end than the older units, this would cause a problem when the drive shaft tried to pass through the Tiger fashioned hub carrier. Drat!
He said it would be possible to machine the ends of the drive shaft to pass through the carrier, but this was all turning out to be extra hassle I hadn't originally envisaged. I still planned to get a donor pack from Tiger at a later stage which included the complete rear differential assembly, I was always going to use this as a spare and recondition it, but it looks like I would have to promote it to being the main component in the build.
I guess at some later stage I will have to purchase matching driveshafts and hubs to go with this differential.
The freshly reconidtioned internals
New crown wheel
Genuine 3.92 stamped on teh crown wheel
Side view, the bolt on CV cup is clearly visible
Shame I don't get to use it right away!
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