Have your truck scanned, there's a reason why the transmission is not going past 2nd gear. The 4L60E is one of the most popular transmission out there and reliable. There are small and inexpensive modification you can have done to your needs. The4L60E has been used in light to medium trucks to light cars to high performance cars. You could have a TPS sensor and pressure sensor or PCM problems. There's just to many thing that can keep your transmission form shifting. Have it scanned at Auto Zone since it's free of charge and hope there is a DTC code. Good luck and keep me posted, be glad to help.
What cost $1,600, did you replace, rebuild or what.
From 1993 Suburban and up the transmission is computer shifted. If replacing or rebuilding the transmission did not fix the problem I would suggest you check the wiring and replace the computer.
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