I have a chance to get a cheap 350 motor and trans out of a 87 2wd suburban will this fit my 89 silverado blazer. How do i tell ?

 

a 350 should fit no problem, but i would be sketchy about the tranny, and if it would mount to your existing transfer case. do you know what the model of the tranny is?? TH350? TH400? both those trannies should fit and bolt up to an NP203 which is probably what you have in your blazer. Hope that helped ya!