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RSchofield

Rear Live Axle Choices (Cortina, Capri)

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Hello, I fairly recently bought a JPR Wildcat (e type Kit car) which has lots of Ford bit attached to it and it's in need of attention.

I'm planning on fitting a larger engine (V6 from an Jag S type with manual box) but I need some advice on what to do with the rear axle.

The donor was a 1981 something (I assume a Cortina as these were popular donors for this kit).

Assuming all the parts came from one car, the donor had a 2.0L Pinto, 3 speed  Auto box and a 3.44 live rear axle. 

I believe it's an Atlas, but not sure if it's a light duty or heavy duty. I would also like to upgrade to an LSD one day but I've read the Cortina axles aren't worth the effort (but unsure if this is only in reference to the light duty axles).

My other issue is I need a ratio closer to 3.09 (like on the 2.8 Capri).

Two issues with the Capri axle.

1. The 2.8 axles seem to be quite pricy, especially if it has an LSD

2. Mounting point are different to my Cortina axle.

Note on my pictures below (Don't look at the rust, please don't look at the rust), I have diagonal arms on the pig head, Capri doesn't seem to have these (not sure what layout is best). I'm also not sure if the widths are compatible. I measure my axle to be 53" form inner flanges. I believe the Capri is 52" which is near enough (but not sure if I am measuring it correctly). Should it be flange to flange. Does 53" sound correct for a Cortina?

So, given that I want to 3.09 ratio diff, with the option of LSD and I want to but a fair bit of power through the axle, and given my mounting positions on my chassis (I'd like to avoid serious chassis modifications as I don't want to go through the IVA) what options are best for me?

Thanks in advance.

 

 

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Could well be a Volvo 240 axle. They are quite strong and I think some/all for the swedish market were LSD equipped from the factory.

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On a second look I think it's actually a Koln axle (Mk3/4/5 Cortina). Look for two bolts near each other at the 5/6o'clock position. They are weaker than an English and I don't think there are LSDs available. As such, they are worth barely anything and best off in the bin.afa838a9355a566baa381351b4bd7935.jpg

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Thanks for the info HotRodMatt, it does indeed have the two close bolts as you suggest. 

Maybe this makes the decisions easier. 

2.8 Capri axle it is. 

It's a shame this will mean new mounting brackets as I really wanted to avoid this.

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25 minutes ago, RSchofield said:

Thanks for the info HotRodMatt, it does indeed have the two close bolts as you suggest. 

Maybe this makes the decisions easier. 

2.8 Capri axle it is. 

It's a shame this will mean new mounting brackets as I really wanted to avoid this.

buy an atlas type cortina axle and have the lsd and ratio of your choice put in it

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My only concern with a Cortina Atlas is many suppliers state that their LSDs are not suitable for the Cortina Atlas, but this may be the whole heavy duty / light duty Cortina Atlas issue.

I think most Cortina Atlas axles have narrower half shafts.

I'll make some calls 

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hi, your axle is a koln axle, if it got a 3.44 diff in it, you are wrong, it can have a 3.45 diff in it, the halfshafts have the same splines as an escort,

the best is to buy a atlas cortina axle, it's the same sice as yours, but the halfshafts have less splines, they are the same as capri atlas axles, a lsd for a atlas axle will fit, the pinion and crownwheel for a atlas axle with a 3.09 ratio will fitt,

so your problem is solved, if your axle has got a 3.45 in it, you can sell the pig head with diff and 2 inches on the side to me, you can bring it to the classic ford show, or sent it by post to my sister in england,

cheers marcel

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Hello Marcel 

I couldn't find any markings on the diff so established the ratio by spinning the wheel and determined it to be just under 3 and a half turns. 

So you are most likely correct regarding the ratio.

Regarding the best solution, I spoke to tickover in Dartford and got the same answer.

Happy to sell it to you for whatever is a fair price. I'll be honest I don't know the value of these

 How does £50 sound?

It won't be soon however as I want to keep it on wheels so I can move it whilst I source an Atlas unit.

No plans to visit a show, roughly where does your sister live. Feel free to send me a private message.

Thanks

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hi RSchofield, my sister lives in corpusty norwich, so it will be postage, witch i will pay for, and 50 ponds is a good price for me, you could grind the pighead of the axle, and stick a tube over the halfshafts and then a tube over the axle to keep it rolling, but i am not in a hurry, the halfshafts have the escort splines, the bearings are 35 by 72 mm, these are only used in this axle, and are worth nothing, cortina mk3,4,5 capri mk2, 3 , escort mk2 use bearings with 30 by 67 mm, escort english capri mk1 atlas axle, use 30 by 62 mm bearings.

the best thing is to take the lid of the axle, on the crowwheel it will say the diff ratio, it could be a 4.11, 3,89, 3,77, 3,45.

if you grind it of like the first picture, that is good for me, on the second picture is an pighead of an axle you are looking for, there is a ring around the diff, where the lid bolts on, this axle has 16 plines, you could find the 3.09 diff ratio on ebay,  of a capri, this will fit the atlas cortina axle, you will find these axles with a 3.75 or 3.44, the differents between the 3.44 and 3.09, will be a 350 rpm's less with the 3.09.

if you need the adress, i will pivate message you it, i can pay for it by paypal, probaly by bank aswell, i do sent my euro's to my sister, to change them cheap for ponds.

cheers marcel

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Hello Marcel,

Thaks for the useful info. That lip/ring will certainly help with the search.

I pulled the lid today. Unfortunately what I assume is the ratio isn't legible. See pic below.

IMG_20181021_194802220.thumb.jpg.92c0aae09eafdf75801b6311ce27623b.jpg

The crown wheel has 38 teeth if that helps at all. If not I will have another go at cleaning it up by I doubt I will be able to read it.

Regarding the condition, there is some discoloration from rust (which is a bit exagerated in the photos) where I assume it has been standing a while.

The teeth themselves however all look in good condition. Tried to capture below.

IMG_20181021_195518244.thumb.jpg.6bd30ff6347d5331e2211a06eda65ae0.jpg

Let me know if any of the above changes your mind.

If you still want it I might continue my search for a new axle for a couple of weeks before cutting as swapping the axle will be a bit less faff.

Thanks

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If you count the teeth on the pinion and divide the crown by pinion, that will give you the ratio.

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hi RSchofield, and yes i still want it, it's got 38 teeth on the crownwheel, than it's a 3.45, the pinion has 11 teeth, no need to clean it , just take your time to find a big axle, when you cut the axle, the only thing you can reuse, are the drums, brakeschoes, that's it, with the rest you can make a axle to rol a car with.

we can up the price for the pighead with diff to 70 ponds, and postage on top of that, i still will be happy, and you got more to get the big axle, so everybody will be happy, cheers marcel

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