skibum56

My son and I are planning to replace the failed engine in his 2000 Mustang V6 (manual transmission) with a lightly-used engine rather than doing a long block. I notice that both internally and externally balanced engines are available, although the vast majority are externally balanced.

How do we determine whether his present engine is internally or externally balanced, or does it even matter if we are replacing with a complete used engine assembly including flywheel and harmonic balancer?

Any help will be greatly appreciated.

Bert

I believe the 3.8s were externally balanced until the 2001 year. You need the flywheel and harmonic balancer with the crank to have a smooth engine.

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Bert