The most common LS swap transmissions are GM’s own: the 4L60E or 4L65E for light to moderate builds, the 4L80E for high power and heavy vehicles, and the 6L80E for a modern six-speed with better gearing. Older non-electronic GM automatics such as the TH350 and TH400 also bolt to the LS bell housing pattern with the right flexplate and converter spacing parts. Manual swaps use GM six-speeds or other manuals with adapter parts. The right choice depends on power, vehicle weight, tunnel space and how you want to control the transmission.
LS swap transmission options
| Transmission | Suits | Notes | From in our range |
|---|---|---|---|
| 4L60E / 4L65E | Mild to moderate power, lighter vehicles | Compact, common; needs electronic control | $2,499.00 |
| 4L80E | High power, trucks, towing | Heavier and longer; strong; needs electronic control | $2,599.00 |
| 6L80E | Modern six-speed gearing and efficiency | Needs the right controller and programming | $2,699.00 |
| TH350 / TH400 | Simple builds without transmission electronics | Needs correct flexplate and converter spacing | Not listed |
All three electronic units we list come with a torque converter; check each listing for fitment and what is included.
Control: the part people underestimate
Electronic transmissions need a controller. Some LS engine computers can control a 4L60E or 4L80E with the right programming; many swaps use a stand-alone transmission controller instead. The 6L80E needs a compatible controller and programming. Budget for the controller and wiring alongside the transmission; see transmission control module.
Swap parts checklist
- Flexplate and torque converter matched to the transmission
- Crossmember and transmission mount for the new position
- Driveshaft shortened or lengthened to suit
- Cooler and lines; see transmission cooler
- Shifter and linkage, plus the range sensor wiring; see transmission range sensor
- Speedometer signal for the vehicle
4L60E vs 4L80E for an LS swap
The 4L60E is smaller and fits more tunnels; the 4L80E handles much more torque and towing but is heavier and longer. See 4L60E vs 4L65E vs 4L80E, 4L60E to 4L80E swap and 4L80E vs TH400.
Good transmission for a C10 or S10 LS swap
For a light S10 or a cruiser C10 with a stock-power LS, a 4L60E or 4L65E is the common choice for its size. For a C10 that will tow or make big power, a 4L80E is stronger if it fits. A 6L80E gives the widest gear spread if you are prepared for the controller work.
Related
See LS swap guide, 6L80 swap, how to install a transmission and our Chevy and GMC transmissions.
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