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Will a 04 4l60e fit in 99 Chevy Suburban?

Yes, a 2004 4L60E transmission should fit in a 1999 Chevy Suburban, but with a very important caveat: you need to verify the specific details of the transmission. The 4L60E had several revisions and variations over the years, and some may require minor adjustments or modifications for compatibility.

Here's what you need to consider:

* Bolt Pattern: The bolt pattern on the bellhousing should be the same. However, slight variations are possible depending on the engine and year.

* Output Shaft: The output shaft diameter and spline count must match the transfer case in your Suburban.

* Electrical Connections: While the basic functionality is similar, there might be differences in the wiring harness connectors. You might need to adapt the wiring.

* Torque Converter: Ensure the torque converter is compatible with both the transmission and your Suburban's engine.

Recommendation: Before installation, compare the specifications of the 2004 4L60E you have with the specifications of the original transmission in your 1999 Suburban. A transmission specialist or a reputable mechanic specializing in GM vehicles can help you determine compatibility. Simply assuming it will fit without verification could lead to significant problems and unnecessary expenses.