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my 700r4 trouble

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  • #16
    Originally posted by SuperBuickGuy View Post

    turbo 350s is how I learned how to rebuild transmissions.... hate those things. 33s, V8, S10 Blazer, change clutches every 10k miles... and yes, it had a cooler that was larger then the radiator.... because I had someone like you who was certain that it was a cooler issue....


    id never diagnose worn clutches as a cooler issue.....
    low line pressure, shaft deflection due to worn bushings,
    glazing due to ground issues, etc....

    but I also know guys who run msd boxes in everything
    and I wont touch em, had nothing but bad luck with them
    myself. guess "your mileage may vary" ?



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    • #17
      Originally posted by fatguyzinc View Post



      id never diagnose worn clutches as a cooler issue.....
      low line pressure, shaft deflection due to worn bushings,
      glazing due to ground issues, etc....

      but I also know guys who run msd boxes in everything
      and I wont touch em, had nothing but bad luck with them
      myself. guess "your mileage may vary" ?


      teenage driver with hp was the primary culprit.
      Doing it all wrong since 1966

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      • #18
        71 C 10 had 250,000 miles on it with a 700-R4 and it was done right. That trans was installed May of 1986 and never been touched with a stock 305 TPI motor.
        When I pulled the combo in late 2013 for the 6.0 4L80E combo it was still running but the motor was burning oil. I had both the radiator cooler and a external cooler on it as I do the 4L80E and it seldom see over 200* and GM states anything over 200* is the killer of any transmission. Mine run around 180* all the time. Keep it as cool as possible and you should never have problems. You have to start with a quality built transmission though.
        Deaf Bob likes this.
        Retirement is better than I thought!

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        • #19
          well I removed pan and filter was in place and found nothing at bottom of pan. Pulled the trans and decided to go Tremec TKO-6 should be alot more fun to drive.
          Deaf Bob likes this.

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          • #20
            Originally posted by 69 Custom "S" View Post
            Pulled the trans and decided to go Tremec TKO-6 should be alot more fun to drive.


            that certainly isn't a low-cost and/or simple fix...
            but it sure will fix it!

            ps my brother did a keisler (now defunct I think)
            tko600 5spd and despite aligning the bellhousing within
            their specs (twice....) it would never upshift cleanly from 2-3
            under full power and over 6500rpm...

            from what ive read this isn't uncommon. just something you
            may want to investigate further, my brother spent over $3500
            after shipping, shifter, etc and in the end we ended up pulling
            for a Muncie m21, which is still working flawlessly 3yrs later...…….

            maybe its just us, but id hate to see anyone else go thru the
            same expense and double/triple work.

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