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Question: What year 700R4 is your core and is there a better/worse core to get.
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Going by the code on the trans it's an 1988.
The cut off was supposed to be 1987 back when I got the trans.
Supposedly the 1988 and above 700's had all the updates to the castings as well as the internals.
The trans has about 15K on it with no troubles at all.
City driving, a few trips 4x4ing in Hollister California, as well as cross county trips.
Since the install I've gone to :
Seattle to Santa Barbara,California, Santa Barbara to Flagstaff, Flagstaff to Detroit, Detroit to my home in Ontario, Canada.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
See ALL my Blazer pic's
HERE