If your dads truck is 88 it had 700R4. They were started in 1982. 82 to 88 were the weaker 700R4's. 1989 and up to the 4l60 were the stronger trannies. If you got 200K on a 700R4 that is very good. Rebuild yours or swap to 400 Turbo. They are the most bullet proof tranny. Turbo 350's are next inline. 400 and 350 turbos will bolt up. Have to change up converter. Turbo 350C's have lock up converter for a little extra on the hiway. This is wat i run in my street rod. Any Chevy 700R4 will bolt up. Just remember any of the older ones are only good for around 100,000 miles. So watch what you get from the wrcking yard.