[doubeys_nova]

Swapping the carriers i doubt will work since everything is metric anymore. swapping the entire axle should work and give you disc brakes in the rear. 16" rim minimum though.

3.42 vs. 3.73 isnt worth the extra cash IMO. i have all 87 Blazer stuff minus front and rear axles(D44/Truck 12 bolt).

You are a step ahead having the 91 trans/t-case though. the electronic output is exactly what you need for the computer.

Purchase the crankshaft extension/adapter piece(like 10-20 bucks) and take the 4.8L flexplate and extend the holes to bolt to the 700R4 torque converter or drill new holes. dont waste your money on adapter flexplates.

With a 4.8L in that you will be very happy with the investment.

If you like deep aggressive sounding exhaust have a shop custom make 2.5" true dual exhaust with typical flowmaster 40 series. most people will not believe me when i tell them it is a 4.8L and it is no louder than the road noise in cabin.

That t-case should mate to the 4L60E in the truck. that would also be another great approach. 4L60's are getting easier to find than 700R4's around here.

All in all, I know you would be very impressed with the outcome by switching to the LSX. If you ever want to go to a bigger engine just drop in bigger and have it tuned again. i am about to put heads on a 6.0 and swap the 4.8 to help sell mine. 6.0's are known to hit over 400-450hp with cam and heads. anything beyond that your not looking for a reliable driver.