Most significant 're-enginings' in aviation history

[andypspotter]

As I was driving up to RAF Coningsby the other day, travelling along mile after mile of straight Fenland roads, my mind began to wander.

Here are my resultant thoughts:

1) P-51 Mustang (Allison V1710 to Packard Merlin)
2) Avro Manchester to Lancaster (RR Vulture to RR Merlin)
3) KC-135A to R (J57 to CFM56)
4) B737 (JT8D to CFM56)

Of course, strictly speaking, the KC-135 is the only true re-engining programme using existing airframes (the others being developments).

It's also notable that the Merlin and CFM56 have been the 'game-changes'.

Are there any other 'biggies' that I've missed?

[tonyh]

Sat in upstate New York chilling! And thinking!
How about also
Tays onto 727s and 111s - only 1 (maybe 2 ) converted.
CFMs ?? onto DC8s and 1 707 that was de-converted later.
I think the F14 got better engines later in life.
Basler , and others, Daks
Hunters -Saphire to Avons.
Not sure if Roller powered Phantoms were better. It was reckoned the F-4Js we got later were better!
Herald from 4 Leonides   Pistons to 2 Darts.
Jetstream from Astazou to something else I can't remember.

Mustang has to be the winner.

Tony