Personally, I'd say drop another 700R4 in, though preferably from a 90-91 year model. They have upgraded internals over the older ones from what I understand. Make sure, though, that you don't get a 4L60-E, as those use the truck computer to control shift points, which the 89 model doesn't have. Also, make sure you get one from another 2wd, since the tailshaft is different on the 2wd and the 4wd. Other than that, if you wanted to build it up with upgraded components, it should last him well.
Need assistance with replacing the transmission.
I have a friend who has a 2WD, 1989 Chevy Suburban with a 350 and the 700R4. The transmission is failing/failed. What is the best, most economical replacement for this truck? Please consider that his son will be driving (probably with a heavy foot) and he wants to tow with it occasionally.
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How much money does he want to spend? The 700R4 can be built pretty strong. Like Crawdaddy said look for a 90/91 model the internals were beefed up a little. The last 700R4 lasted him how many miles? Probably enough to be a good recommendation for another one.
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