Hey guys, Im changing the diff in my mk2 cause it blew up, and im putting a 3.54 in it, out of a 2litre. Iv got a 3.77 in it at the moment.
 
Now... If I put taller gearing in.. wont the mean that the wheels will now be spinning faster then what they where at the same rpms?
Its a 1.6, and Iv got a manual box out of a 2litre, and the speedo cluster was out of a 2litre Ghia.
 
So im hoping that my speedo was off in the first place and it fixes it once I put the 3.54 in.
 
Also, do the 2 litre sedans have the bigger drums then the 1.6 sedans?
 
Cheers,
Brandon.

All depends what speedo drive is in your gearbox, and this is the only difference between a 1600 and 2 litre box.  From memory with a 3.54 at 100kmh your tacho should be around 3350rpm where as with a 3.77 its more like 3500rpm.
 
There is no difference in the drums.
 

There are 2 sizes of drums on the backs of Escort s  7 inch and 9 inch ----is what you need --  There was some info on this site about the speedo drives maybe do a search --- it could still be heer--- they are a sod to change you have to pull the gear box a part ---

Ahhhh, what escorts do the 9 inch drums come on? And even if it is out I'm not gunna bother changing anything hahha.

what escorts do the 9 inch drums come on?
on the vans and sports  and the gear  i think  --- they are ease to change and the cortina  9 inch drums ( Mk 3  4 and 5 all fit ---

I have been looking at this sort of rear brake options myself instead of bigger drums, there would be other people making these kits but as an example. 
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=230663645911#ht_3871wt_1139