Here's why a direct conversion is impossible and what you'd need to consider:
* Different Transmissions: The Astro and Safari, even with AWD, may use different transmission models (e.g., different 4L60E variations or entirely different transmissions). Even if the model number is similar, internal gearing and control systems might vary.
* Bellhousing Compatibility: The bellhousing, which connects the transmission to the engine, is specifically designed for the engine in each vehicle. They won't bolt together.
* Transfer Case Differences: AWD systems are complex. The transfer case, which distributes power to the front and rear axles, will be different and likely incompatible.
* Wiring and Electronics: The transmission control module (TCM) and its associated wiring are unique to each vehicle's system. You can't just plug and play.
* Mounting Points: The transmission mounting points on the chassis are unlikely to align.
In short: This is a major undertaking that's far beyond a simple swap. It would require extensive custom fabrication, machining, electrical rewiring, and potentially significant modifications to both the van and the transmission itself. The cost and complexity would likely far exceed the value of the vehicles involved.
If you're looking to repair or replace the transmission in your Safari, you should focus on finding a correct replacement transmission for your specific Safari model and year. Trying to adapt a transmission from a different vehicle is not a practical or cost-effective solution.
