
05-15-2008, 07:22 PM
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Posting Guru
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Join Date: Sep 2003
Posts: 1,792
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I think all the AWD vans came with the 4 liter engine, just to help move the added weight. The manual transmission vans only had the 3 liter engine. I know that the same transmission has been used on 4wd Bronco-II, but I think they had a high failure rate, as they can not handle the load. So I'm sure those poart will fit, but I don't think they will last very long.
If you wanted to add a 4wd transfer case to an Aerostar with a 5 speed manual, you're looking at starting with a 2wd with a 3 liter engine. But that's just the start; you will also need the front axle and drive shaft, and the crossmember and suspension from the 4wd vans that will allow you to install them. It would be easier to start with a 4wd van and try to adapt a stronger 5 speed manual transmission to it.
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