1998 K Series 350 - 454 Swap

[konajoe]

I have two trucks, both are 1998s. One is a 2500 Silverado ext cab and the other is a 3500 Cheyenne crew cab, both are 4x4 automatics. I'm thinking of swapping the engines between them, Vortec 454 and Vortec 350

I'd imagine it would be a pretty simple swap since the trucks are very similar other than the small/big blocks. I can only keep one truck and would rather like the big block crew cab combo.

Both trucks are 8 lug, 14bolt full floaters, 4.10 gears, 4x4, 4L80E, hydroboost, additional hd coolers. The 2500 has a New Process push button and the 3500 has a Borg Warner manual transfer cases, T

Am i oversimplifying this and missing anything major?

 

[CT-BLAZER]

Computers would be my question .....

would expect to swap them too.

 

[folkenheath]

I think since you have both donor trucks you should be able to swap all the wiring over to make it work. I think it will take longer than you think because of the wiring but it should be doable if you take your time and do it right.

 

[CT-BLAZER]

In the square body era..... A gm harness could be split at the bulkhead..... And a different harness plugged in....

IF both share the same circuits it should be a simple unplug the original 5.7 engine harness and connect the 7.4 engine harness to the bulkhead.

 

[konajoe]

Thanks guys...

I'm thinking the PCMs and matching harness would need to be swapped. I'd imagine that the trucks would be pinned similarly at the firewall plug?

This is a stock 98 Vortec harness, possibly a 5.7 looking at the injector connector.