Will a transmission from 1985 work in 1996 Tahoe there both 700r4?

While both are 700R4 transmissions, a direct swap from a 1985 to a 1996 Tahoe is not guaranteed to work without issues. The 700R4 underwent several revisions and improvements throughout its production run. Differences might include:

* Internal components: Gear ratios, valve body design, and other internal parts may vary, leading to compatibility problems or reduced performance.

* Computer control: The 1996 Tahoe likely has a more sophisticated electronic control system for the transmission than the 1985 model. The older transmission might not be compatible with the newer computer's signals, resulting in poor shifting or failure.

* Torque converter: The torque converter may also have different specifications, affecting performance and potentially damaging the transmission.

* Mounting points/bolt patterns: While unlikely to be drastically different, minor variations could exist requiring modification.

In short: While it *might* bolt in, it's risky. You'd need to carefully compare the specifications of both transmissions to ensure compatibility. Even then, problems are possible. A used transmission from a similar-year Tahoe is a much safer bet. It's strongly recommended to consult a transmission specialist or a reputable parts supplier for a proper assessment before attempting the swap.