Hey dudes, new to the fourm, new to blazers, i have a 2002 blazer in great shape but its got high km. I have a 1994 lt1 engine/ trans out of a old road master. I am wondering if anyone has done a swap like thus and if sohow hard or easy is it

 

can become a nightmare as the 2002 electronics will be left out. so parts wont work no more. The 1994 would need to be transplanted with his electronics.
By replacing the Trans as well you will run into troubles providing several signals to dash indications. i.e. VSS signal, temp signals etc.

just some of the considerations.

You write km, which would be a hint to be residing in Europe.

I‘d run the original as long as it runs fine, then rebuild.