4.3 5 speed swap to 350 w/automatic, keeping 5 speed

[eric flowers]

I have a 94 only it's a 2 wheel drive and 4.3, with a manual 5 speed I am about to put a 350 in it,91 model, engine looks and set up identical,both are TBI and all the wiring is the same, I hope I can make it work

 

[b454rat]

should be a simple swap....

 

[L31MaxExpress]

ECM is going to be the hardest part. The 5spd V6 trucks used the newer style automatic ECM. The 5spd V8 trucks used the older style ECMs. Either going to have to change up the wiring or have a custom chip created starting with a V6 bin file.

 

[Schurkey]

should be a simple swap....

Just ask DeCaff2007 about that.

Multiple threads, and about ten thousand posts. One wiped cam, glowing-red headers, fitment and ECM problems...

Granted, most of it was tragically self-inflicted.

 

[eric flowers]

I have a question, should I use the clutch that was originally in the truck as a 4.3 or should I change it to the clutch that it would have had if the truck came out with a 5.7, the reason I ask is the clutch is new that was in it as a 4.3

 

[Schurkey]

Is there a difference in the clutches? If one is different--bigger disc, more powerful pressure plate, etc., then I'd want the one that handled more torque.

I'd kinda expect that the clutches are the same, maybe the flywheel is different due to balance.