* Different Transmission Types: The 1999 Blazer likely has a 4L60E transmission, which is a electronically controlled automatic transmission. The 1986 Suburban likely has an older, mechanically controlled transmission like the TH400 or TH700R4. These transmissions have different bolt patterns, internal components, and control systems.
* Different Transfer Case: The Suburban likely has a transfer case attached to the transmission, which is a separate unit that allows for four-wheel drive. The Blazer may or may not have a transfer case, and if it does, it will likely be a different type and won't be compatible with the Suburban.
* Engine Compatibility: The transmission is also matched to the engine. While the Blazer and Suburban may share some engine options, the 1999 model likely has newer engine configurations.
It's important to note that there is no easy way to swap transmissions between different model years and generations of vehicles. The parts are not interchangeable, and attempting to do so can result in serious damage to the vehicle.
Instead of trying to adapt a Blazer transmission, you should:
* Find a transmission specifically designed for the 1986 Suburban.
* Contact a reputable transmission shop or mechanic who can help you find the right transmission and install it correctly.
Remember, attempting to use an incompatible transmission is dangerous and can lead to serious mechanical problems.
