Gearing for EA Sports

[Jack in the Box]

I don’t run a 4 speed box in any of my SWB cars but I have changed all of them to from 4.9 to 5.25 ratio which I find to be an excellent mod. if you want to stay in top gear for longer.

Thanks everyone for your input.

I plan to borrow a couple of 17" wheels, after checking the rolling radius, to simulate the axle ratio change.

If I like the result, I'll try and fit a 5.25 CW&P.

The car is fitted with a banjo rear axle. I also have a D type axle assembly with a 5.25 diff. Does anyone know if the CW&P parts are interchangeable please?

Alan

[Ruairidh Dunford]

Can you post a photo of the Banjo casing you currently have please?

[Chris KC]

I think directly interchangeable only if you have a late banjo axle (1931-2) and an early D axle (pre-1934).
A post -'34 D axle has a 1.125" step on the pinion shaft, which in theory can be ground off to fit the earlier ('31-'32, '32-'34) types.
Though for my money I'd look for another one.

[Jack in the Box]

Can you post a photo of the Banjo casing you currently have please?

I'll try ...

[attachment=3686]

[Ruairidh Dunford]

That appears to be a 1930-32 type and ‘almost’ all the c/w and pinions will fit in it. Certainly a 5.25 will.

[Jack in the Box]

I think directly interchangeable only if you have a late banjo axle (1931-2) and an early D axle (pre-1934).
A post -'34 D axle has a 1.125" step on the pinion shaft, which in theory can be ground off to fit the earlier ('31-'32, '32-'34) types.
Though for my money I'd look for another one.

Chris,

Am I correct in thinking that if the D axle has non-Girling brakes, I should be OK?

Alan

[Robert Leigh]

I think directly interchangeable only if you have a late banjo axle (1931-2) and an early D axle (pre-1934).
A post -'34 D axle has a 1.125" step on the pinion shaft, which in theory can be ground off to fit the earlier ('31-'32, '32-'34) types.
Though for my money I'd look for another one.

Chris,

Am I correct in thinking that if the D axle has non-Girling brakes, I should be OK?

Alan

I am using a 5.25 axle with 15" wheels (145-15 rear, 125-15 front) and a late 4 speed box with Keith Rawson close ratio gears (straight cut so they do whine, and I get questions about the supercharger!). This combination suits me. I have driven a standard Ulster to Sweden and was very impressed with second gear; I never checked the rear axle ratio.
Robert Leigh

[Chris KC]

I think directly interchangeable only if you have a late banjo axle (1931-2) and an early D axle (pre-1934).
A post -'34 D axle has a 1.125" step on the pinion shaft, which in theory can be ground off to fit the earlier ('31-'32, '32-'34) types.
Though for my money I'd look for another one.

Chris,

Am I correct in thinking that if the D axle has non-Girling brakes, I should be OK?

Alan

Erm, not sure Alan, especially as quite a few earlier axles have been converted to Girling brakes. I'd look for the date on the casing as a start point, if it doesn't say '34 you know where you are. If it does, you may draw some tentative conclusions by poring over various lists of changes and dates, but it's still a bit of a lottery I'd say.

[Robert Foreman]

If you have a stepped later pinion shaft you don't need grind it down, just fit a LRJ roller race instead. If you choose to grind it then it needs to be perfect otherwise you will have issues developing.

[Ian Williams]

Alan, changing the rear axle ratio will not help your gearbox issue, if anything it will make first even less usable, bite the bullet and sort out the gearbox before you start mucking around swapping CWP's