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700 R4

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mr. Jimmy, May 7, 2002.

  1. Mr. Jimmy

    Mr. Jimmy Registered Member

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    Just curious as to what the average life expectancy of a 700 R4 tranny is , if not abused? My 89 has 135K on it now, but I am not impressed with shift firmness. I have a lot of experience rebuilding milling machine and lathe trans. and clutch packs, how complicated is the rebuild of the 700 R4?
     
  2. Rebel88

    Rebel88 1/2 ton status

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    dont know about how hard the rebuild is but from most of the transmission guys i have talked to you usually get about 100k to 150k out of a 700. my 88 burned up its first one at 105k and my 86 s10 burned up its 700 at 130k so the number sound about right.

    Later
     
  3. Big_B_Murphy

    Big_B_Murphy 1/2 ton status

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    There is no set life expecatancy to a TH700. My K5 was on it's second when I bought it at 87K. Blew it by 89K. I have no Idea how either were treated before I bought the truck, but I bought it from a 75+ year ols man.

    My 84 Z28 lost it's first at 110K and the second was on it's way out at 170K. Both odf these were run hard. What can you say I was 20 when I bought the car.

    I have a buddy who is on his third th700 in an 89K5. He has had it since new and has not abused the truck. Only off roading is on the outer banks of NC.

    If you have gotten to 135K I would assume that your time is limited.
    I have no idea on how tough it would be to rebuild a th700, I converted to stick.
     
  4. Oblin Goblin

    Oblin Goblin 1/2 ton status

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    I don't know that there really is a "life expectancy" for a 700r4. I've heard 100,000 to 150,000 but my original went 180,000 miles before it started hesitating on the 1-2 shift. That was towing 5000 lbs through the mountains pretty regularly, behind a Diesel no less. The auxillary cooler probly helped alot though. My second one only lasted 30,000 with no towing (Aamco rebuild). Tough to predict the life or 700r4. I wouldn't worry too much about a lack of shift firmness. One of the things I hated most about the 700r4 was how lose it felt.
     
  5. Blazinaire

    Blazinaire 1/2 ton status

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    No horror stories here, but my first 700 was replaced at 130k and I am now at 181k with the 2nd and no problems.
     
  6. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    Before I bought my '85 it 's 700 had supposeedly been rebuilt 4 time by the same guy. I think that was more the guys fault and afte rI bought it it went out again so got it rebuilt then about 50k after the pump went out then a bim mire mileage and I blew up teh torque converter and pump again. Finally got it rolling again lst week. Just problems with lockup bugs now
     
  7. Dunc03

    Dunc03 1/2 ton status

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    I've got 190K and counting on mine, but the shift really sucks and it is probably going to croak soon. I heard someone talking about getting them from gm. Does anyone know if they have those prices online, or would i have to contact a dealer.
     
  8. Mr. Jimmy

    Mr. Jimmy Registered Member

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    You may be able to firm up the shift some by adjusting the TV cable. I have got prices of around $1300 for GM 700R4.
     
  9. txbartman

    txbartman 1/2 ton status

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    There was an article a few months back in one of the rags specifically about rebuilding a TH700 tranny. I don't recall if it was 4 Wheeler or 4 Wheel Off Road (I think the latter). Doesn't look too tough as long as you have enough space and patience. My first one lasted until about 110K. I am on 170K now with the rebuilt one and it is running well.
     

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