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[TheBoy]

.. but a 3.307 diff is a very tall ratio for a 5 speed gearbox! Might be worth making sure you're happy with the performance with this ratio first. It would suit a diseasel engine nicely.

A diesel Manta, urgh!

I suppose it'd be unique though

[aaronjb]

.. but a 3.307 diff is a very tall ratio for a 5 speed gearbox! Might be worth making sure you're happy with the performance with this ratio first. It would suit a diseasel engine nicely.

2.88 in my toy car.. 

[Doctor Gollum]

Yeah, but that will do 0-HolyshitIamabouttodieinafireball in top

[mantaray]

A diesel Manta, urgh!

I suppose it'd be unique though

Has been done. I friend of mine, used to have a 1.7 Diesel Astra engine in his Manta hatch about 10 years ago.

.. but a 3.307 diff is a very tall ratio for a 5 speed gearbox! Might be worth making sure you're happy with the performance with this ratio first. It would suit a diseasel engine nicely.

Used to run a 3.44:1 diff before, and it was too high. The 3.307 seems to be fine, acceleration is still eppic and will will crouse quite happily at 70-80 mph. Top speed not too worried about, had her up to 120 with more still there, but the car was never designed for that speed and the front end starts to go light above 110 mph.

[Kevin Wood]

What engine is it running?

If you're happy with it, I'd source the closest gearbox speedo drive pinion to the "correct" ratio, then talk to speedy cables if the speedo is still too far out.

Speedos are normally set up to over-read by a small margin.

[mantaray]

What engine is it running?

2.5 V6, 215bhp last time she was on the rolling road.

[Kevin Wood]

Nice.

I guess it has the power-to-weight to cope with longish gear ratios.