Front propshaft does not fit anymore!

Right then i'm hoping that someone can help me.....Please!
Have a Disco 1 V8 auto for off roading, i have removed the 3.5 and fitted a 3.9 serp engine from a rangy. Also changed the auto box for one that has the Borg Warner transfer box, she also has a 2" spring lift. All good so far..... until everything goes back together rear prop fitted like a dream.... front prop has shrunk...it does not fit! The splines slide in and out to it's full travel but it will not fit it is about 2" short. So can i make a spacer to make up the difference or is there any other mod that i can do or am i just missing something here??

Any suggestions guys

Thanks
Martin

borg warner front output housing is shorter than lt230 you will have to get rr front prop that had borg warner fitted as std