Donar Dilemma

[Trif]

Originally Posted by Bonzo

That'll be a 1998 R/S plate & would need a CAT fitted if installed pre IVA

I'll bear that in mind. I am I right in assuming that that wouldn't be the case if fitted after the IVA?

[snapper]

Once you have gone through IVA you will have emissions set on the V5 based on the engine age at IVA, after that any engine will be ok as long as the emissions are as stated or better than on the V5

[mr henderson]

If you plan to use the Getrag box, check the 5th gear ratio, as some Getrag boxes are direct top, and require a suitable long-legged diff ratio to loower cruisng revs to a tolerable level.

[Trif]

Originally Posted by mr henderson

If you plan to use the Getrag box, check the 5th gear ratio, as some Getrag boxes are direct top, and require a suitable long-legged diff ratio to loower cruisng revs to a tolerable level.

What sort of ratio should I be targeting and how do I tell if the box is a direct top?
Trif

[mr henderson]

Originally Posted by Trif

What sort of ratio should I be targeting and how do I tell if the box is a direct top?
Trif

Ford boxes are usually in the region of .87 for 5th gear, so a diff ratio of 3.6 ish is ok. If your box is direct top then you would be looking for a diff ratio of around 3.1 For your box google with all the details would be a good place to start, alternatively find a way of turning the input shaft and see what the output does.

[twinturbo]

3.14 Sierra Diffs Are very very rare!

TT

[mr henderson]

Originally Posted by twinturbo

3.14 Sierra Diffs Are very very rare!

TT

Indeed, which is why he needs to check the gearbox.