Hey all, well i have a w123

2 door coupe' 1985 with turbo diesel engine, however the car used to have a m110 engine in it, so the diff is 3.58 or something.

I got myself a 3.06 ( closest i could find for the 3.07 straight swap ) In Australia we didn't get w123 turbo 300D's, only NA, so the ratios are 3.46 on them all here.

Anyways so 3.06 ratio diff is downstairs. ( from a v8 engine 450slc )
https://mbturbo.com/gear-ratios/

I've read the guides here
https://www.peachparts.com/wikka/W123Differential
and here
https://mbturbo.com/how-to-change-final-drive-w123/

but i read that i may have to swap some spacers and a yoke ?

can anyone help with a guide for them with pictures/tips or something please ?

it would be greatly appreciated. The engine makes too much unsettling noise down the highway with this diff.

3.58 m110 ratio to a 3.06 is a 17% reduction in engine rpm

so 4000rpm down the highway/motorway is now 3320rpm, should ease up on fuel consumption and keep it closer to peak torque for everyday driving.

Also, it is a 4 speed manual, so each gear should last longer before needing to change and i wont be crying for a 5th gear as much