My 1989 Suburban with 190k miles on it needs a transmission. The current one is "chattering" when it shifts and if I use overdrive on a highway trip it gets hot and leaks oil. I don't have time to take it out, rebuild it or get it rebuilt, and then put it back in. I'd rather get a rebuilt one and swap it out in a weekend. I priced transmissions and a GM rebuilt is $1240 with a 3 year warranty. A Jasper is $1360 with a 3 year warranty. Advance Auto has a "Accurate Reman" for $850 with only a 15 month warranty. We currently have no plans to ever get rid of the Suburban, but it's hard to say for sure that we wouldn't go for something more modern in a few years. We've had it 10 years now and have been happy with it. Which option makes the most sense?