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Just been cleaning off the back axle and noticed this, does this look normal or have I got frankenstiens axle? 

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Yep, as Col say's, Normal (but clean), standard English/Timken axle unit.

 

They are made from about 8  different sections, all seam welded together on a jig, you could not (in those days), press a complete Banjo case all in one section, be careful how aggressive you are cleaning, they have been known to get small pin holes from years of the rust biting into the steel, and a bugger to get a good weld on a crack or pin hole as your chasing the pitting in the metal.

As eeb43 say's wrong year/type diff casting, but the ratio might by chance be the correct one for your application, a bloody good axle in my opinion, ok will not take Cosworth engine torque/power, but will handle good power outputs as long as your not wheel spinning all day, about 9million % better then a Borg Warner or Kolne rear axle, reliable as the day is long, I love them. 

The diff casting is an Escort item (73 AG) AG denotes Escort origin, the 73 is the year identifier that the part/item/casting was introduced, you will see things like -: 69EB (Capri item from 1969 on) 70EB (Capri item from 1970 on) 73 AB & 73 AG Escort item from 1973 on etc-etc

B = Britain

G = Germany

But could have been made in one of about 20 foundries Ford UK used for casting parts, not all were made in house, a few did get made by outside companies licensed by Ford.

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4 hours ago, caprimk1v4 said:

 careful how aggressive you are cleaning, they have been known to get small pin holes from years of the rust biting into the steel, and a bugger to get a good weld on a crack or pin hole as your chasing the pitting in the metal.

As eeb43 say's wrong year/type diff casting, but the ratio might by chance be the correct one for your application, 

I only scraped off the old....... Waxoil.... Oil..... Sh*t..... Wot ever it was that was on there with a flat blade screwdriver then wiped it with a cloth, was just going to hammerite it 

I'm just using a standard 1500 precrossflow with gt carb and exhaust so nothing very radical, how would I know if its wrong ratio as don't no wot a proper set up would drive like anyway? It doesn't really want to do anything over 55mph but then that's probably more me than the car! 

Would it just seem like it hasn't enough guts to accelerate thro gears or seem like changing too quick I suppose? 

Surely a 1500 can't be too much for many diffs anyway? 

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Hi,

 

Not my subject Cortina MK1's more a Capri & Escort "Anorak", as that is what I grew up with.

Your Cortina should have a relative good turn of speed, after all, 1500 is a good size, don't know if it is in GT spec or non GT, but I would guess it should have between 60 & 75 BHP !!??.

 

Again, I don't know what your Cortina would have as a "STANDARD" ratio, I am going to say it would have something like a 3.89/1 ratio from factory, or a true 3.9/1 ratio,  that should then give it reasonable acceleration and a acceptable top speed, if you go too far one way, like having a 4.444/1 ratio diff (that is a Ford ratio that will fit your axle), then she would accelerate quite rapidly from stand still & in gear acceleration, but your top end would be lower, on the same note if you went for the Escort MK2 Mexico/1600 Ghia/1600 Sport diff ratio of 3.54/1, then your car would lose initial off the mark & in gear acceleration, but the top end before the engine ran out of grunt would be higher.

If your ever pulling the diff out to do something, then count the teeth on both the Crown Wheel & pinion and dived the number on Crown wheel by the number on the pinion example -:

37 teeth on C.W. 9 teeth on Pinion would be 37/9 would be 4.111111 or a 4.11/1 diff ratio.

There are other ways like car in top gear and measure the amount of turns of the back wheel to the turns of the crank shaft, but not as accurate as actual counting teeth.

 

Al.

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Thanks Al, 

I don't intend on pulling the diff out anytime soon, but acceleration from standing still is pretty responsive if I do say so myself, top end isnt much but then I haven't pushed ( nor am I likely to) as last time I was doing 60 it sounded like the gearbox/axle wasn't too happy spinning that quickly but then again that was on the way home after buying it several years ago an it'd been sat still for umpteen years before that so hardly surprising I guess! 

The motors is standard form but has gt carb and stainless gt exhaust manifold with custom straight through pipe on so not really sure wot top would be if the diff was correct anyway 

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Hi,

 

It does sound as though you have a low ratio diff in your rear axle !!??, (Low ratio is a bigger number as in 4.125/1, a high ratio diff would have a smaller number as in 3.54/1).

It depends on what you want to do with the car, if you want a nice relaxed, quiet, long distance cruiser, with good fuel economy, then you want a tall or high ratio diff, if your trying to out accelerate other cars away from the traffic lights, you want a short or low ratio diff, but there are limits, a very tall ratio axle would be say from the likes of a 3000 V6 Capri, that would have either a 3.22/1 or 3.09/1 diff ratio, very tall indeed for a Ford, but your 1500 Cortina engine would not have the power or torque to pull that ratio, and you would never get into top gear.

If your happy with how it drives, and it is not breaking the bank at the fuel pump, leave it alone and enjoy it, if like me, my classic cars are just items that I look at and polish, my Capri 3000E did a MASSIVE 1.4 miles in just over 10 years, but I sat in it and wiped it over at least once a week, people say it is a waste, yes I understand that, but the condition I got them in, you would never want to put them on the road, people collect bottles of fine wine, they don't guzzle a bottle down on a Friday night with there fish & chip supper.

That's a nice Cortina you have, you should be proud of it.

Fords are my hobby, if I could ever help you out in any way, please just contact me here, I will try/do my very best to help you or anyone out.

 

Have a nice day, give the Cortina a wipe over with a soft duster from me.

 

Cheers.

 

Al. 

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Thanks Al that's very kind of you, I do drive the cortina, before I changed the carb and exhaust she was quite a gentle drive, not fast and only pushed to about 60mph on the way home from buying her, but she was sounding a bit uncomfortable so backed off, havent drove it anywhere of any distance since owning it, just around town etc 

Now the new carb an exhaust is on she's a very different drive, quite twitchy if that's the right description, plop your foot hard on the go pedal and from standing still she's moves like a rocket! Obviously not bmw M3 kind of go but enough to make you smile, I don't have it to put boy racers to shame, that was my old model A with a big V8 an kept getting me in trouble an I couldn't resist smoking the tyres at the lights 😂so now I just want a tidy car to drive and enjoy  no police involved 😂

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