Pairing a 4L60E with an LSx engine requires the right bell housing. Most 4L60Es came with SBC pattern, while LS engines use a different pattern. Heres the conversion options.
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Bell housing patterns
SBC/BBC pattern:
LS pattern:
Adapter options
Bellhousing.com SBC-to-LS:
Hughes Performance:
Modified flexplate:
What you need
- SBC pattern 4L60E (have it)
- Adapter plate $200-$400
- LS flexplate for 4L60E $120-$200
- LS starter $80-$200
- LS-compatible PCM/harness
Total cost
- Parts only: $400-$1,000
- With labor: $400-$2,200
Easier path: LS pattern 4L60E
From LS-era truck:
Performance limits
- Stock 4L60E: 350 ft-lb (4.8L OK)
- HD 4L60E: 500 ft-lb (5.3L tune OK)
- Above: 4L80E recommended
- Read our 4L60E to 4L80E swap
Common mistakes
- Wrong bell pattern assumption
- Wrong flexplate stand-off
- Wrong starter mounting
- Inadequate cooling for LS swap
Cost summary
Adapter approach:
LS pattern trans approach:
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