Tongue in cheek

Thanks for the reply's guys, Got it on the 4x110 thanks Hiro, If I found a KE30 complete diff would it bolt up to my KE 20? as the current diff in my 20 seems like it could do with some sawdust and bananna skins in it....

Hi All, I got a 73 KE20 with 4x100mm stud pattern 12" jelly bean rims, She's got a 4KC, 5speed box and unknown diff. With this set up the speedo is reading 120km/h when I'm sitting on 100km/h. I've been wanting to go bigger on the rim size for a while and this I hope will both look good and drop the RPM's at 100km/h. So Ive bought some 14inch Celica alloys with 4x114.3mm stud patern, these rims came with a 79 celica coupe attached to them. My question is how hard is it to get the 14's from the Celica to fit the Ke20? Now the front seems simple enough just take the hubs off the celica and drop them onto the rolla, but the rear has me a bit more confused. Can I somehow use the complete diff from the sh*tty Celica? The diff in the Ke20 is a little whiney so I don't mind changing that if needs be. Thanks guys, Anthony