Changing Diff

[Guest owenpilson]

im changing from a 2.0 cortina diff to a 1.6 diff.........

 

its attatched to a 4 speed cortina box aswell

 

what will this do to my top speed .....

well its not top speed im bothered about it the revs whilst crusing that might cause problems.

 

cheers

owen.

[Guest daveg]

Owen

 

Without knowing the ratio's...it will probably improve your acceleration (fun) but the rev's will be higher for a given cruising speed...

 

Hope that help!

 

Dave

[Guest owenpilson]

that it you see , i cant seem to find the ratios of the 2 diffs on the web

 

owen

[Guest TerryBarry]

If you can believe what it says

Haynes Manual #343 states

1.6 Cortina axle ratio 3.89:1 - standard saloon & 4.11:1 - optional saloon and estate

2.0 Cortina axle ratio 3.75:1 all variants

As you might expect the 2.0 has slightly higher gearing.

It also states :

"Two axle housings are used (A type) and the heavier (B type). Construction is identical and only external differences being the axle housing and the pinion flange"

1.6 = A type 2.0 = B type

 

Terry

[Guest owenpilson]

is the pinion flange different also......

 

will that cause a problem mating the proshaft to it?

 

owen

[Guest TerryBarry]

There is only a sketch illustrating the differences between the two axle casings

The type B looks slightly "beefier"at the front & back and the pinion drive flange does not appear to protrude as much from the casing.

The pinion flange diameters look the same.

But the type B casing appears to be slightly shorter in terms of the distance from the centre line of the half shafts to the pinion flange.

If you were to get one from a scrappy it would certainly be worth running a rule over it first.

Sorry if I may have added confusion - I'm building a 2B based on a Sierra, just had the manual to hand.

Terry

[Guest owenpilson]

cheers terry i'll measure it up and go to the scrappy tommorow

 

owen