Gearbox internals

What gearbox internals from other vehicles will fit in the Puma gearbox?

I'm thinking about the possibility of using the gears from a diesel, so I get lower ratios in 1st to 4th with a higher ratio in 5th.

http://st2000.s5.com/RatioCalculator.xls" onclick="window.open(this.href);return false;
This simple Excel Spread Sheet is quite useful for calculating road speeds, dependent on gear ratio, FD ( CWP ) and tyre diameter.
As far as what Ford IB5 gbx internals will fit in a Puma IB5 casing, any from vehicles that used the IB5 5 speed gbx. All FD Crownwheels were made with a 8 bolt mounting to the Diff housing. So Crownwheels are interchangeable to give a higher or lower final drive, obviously you also have to change the layshaft to match the Crownwheel as the pinion gear is machined on to the layshaft ( CWP are matched sets to give the FD ratio ).

Maybe simplest solution would be a lower FD ratio, giving you lower gearing for 1st - 5th gears, then changing 5th gear ratio, to give you a higher 5th gear.

These are Fiesta and Puma ratios. (copied from jason33 of zsoc)

1.25/1.4 and 1.6 Zetec S Gear Ratios were found to be as following:

1st 3.58
2nd 1.93
3rd 1.28
4th 0.95
5th 0.76

The 1.7 Puma box however has a slightly taller 1st gear and a closer 3rd, 4th and 5th gear:

1st 3.15
2nd 1.93
3rd 1.41
4th 1.11
5th 0.88


The 1.6 Zetec S, has a 4.25 Final Drive Ratio

The 1.25/1.4, has a Final Drive Ratio of 4.27.

The 1.7 Puma has a Final Drive Ratio of 3.82

People tend to go down the route of 1.6 Zetec-S ratios and the Final Drive from a 1.7 puma which is the same as an Ford Racing Puma box.
Hope all the info helps?

Blimey. Are you a gearbox expert!? :lol:

Great information, thank you! :thumbs:

Well something like that.
Some more useful info on the Ford IB5 gbx, it's use in Fords product range and the ratio and FD specs:
http://www.hendypower.co.uk/.../ford_engines.." onclick="window.open(this.href);return false;.
This is a really comprehensive list of which cars you can source ratios and FD from