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4L70e or built 4L60e?

This is a discussion on 4L70e or built 4L60e? within the Automatic Transmission forums, part of the Drivetrain category; I have a K5 Blazer that I put a 2000ss Camaro LS1 in with a 1999 Tahoe 4L60e 4x4 transmission ...

  1. #1
    Junior Member ls1k5's Avatar
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    84 K5 Blazer w/ LS1

    4L70e or built 4L60e?

    I have a K5 Blazer that I put a 2000ss Camaro LS1 in with a 1999 Tahoe 4L60e 4x4 transmission in it. It's been ok for 40000 miles but the 2-3 shift has always been a bit mushy, the tranny cooler line blew off recently and after repairing it I drove 50 miles and then no 3rd or 4th gear. The fluid now looks like pearlescent paint so I'm guessing a clutch pack or band went away. I'm wondering if I should get a used 4L70e out of a Vmax, a new GM performance 19260961 trans or build my 4L60e. Any advice would be greatly appreciated BTW the LS1 is basically stock.

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    pajeff02's Avatar
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    '02 WS.6 / '07 Suburban

    A fully built and reworked 4L60E can work really well -- we have one in our Trans Am from Performabuilt that we thrash on a regular basis. If you want to up the ante - a 4L80E, basically a modern version of the Turbo 400 with overdrive, is a real good choice as well, even in stock trim.

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