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Thread: '94 K2500 Transmission slip...

  1. #1
    Join Date
    Jan 2020
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    Trabuco Canyon, CA.
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    15

    Default '94 K2500 Transmission slip...

    Noticed slight slip/delay during downshift at less than 5 mph up a steep paved grade. 340K on vehicle and I assume on trans. What's the average life of this generation transmission? Ball park $$ to have it rebuilt? While trans is out, is it sound to install new rear main seal? Or too many miles on thrust bearing to matter? Oil pan is creased, so time to replace that and leaky oil filter adapter housing o-rings etc. as well.
    Thanks!!
    '94 K2500, '82 VW Veggie Cady (sold), Standby: '99 E-350 gasser, Racer: 1964 Front Engine Dragster on E-85.

  2. #2
    Join Date
    Apr 2001
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    Newberg Oregon
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    Hi

    With that amount of miles.....Yes....a complete overhaul on the tranny.....Average life span.....subjective.

    If they are taken care of well.....Vs not so much.......340K is a really good run......

    Get it overhauled before it eats itself up....The 4L80 does not like junk running through the valve body (Aluminum)

    Definitely replace the rear main seal while the tranny is out .......If it is leaking a bigger yessssss.

    Get all the goodies fixed while you are in there........

    As far as cost....Depends on many things.....If the tranny can be saved with seals, clutches and such.....Definitely a fresh converter......Usually bushings and thrust washers.

    Shift solenoids for sure.

    Get referrals on a good local shop that has a good track record and knows what they are doing.....Stay away from the big box shops.......
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  3. #3
    Join Date
    Oct 2001
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    Granby, Missouri, USA
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    I got 375K out of mine before the torque converter started slipping and wouldn't stay locked up. I pulled the transmission myself and had it rebuilt locally by a reputable shop. It cost me $1600 a little over a year ago.

    NOTE: make sure you order the correct torque converter! The diesel uses the low stall converter; most transmission shops don't realize this and will get you the higher stall torque converter. A lot of the parts listings that the shops use only list one torque converter.

    I had the transfer case gone through at the same time. It wasn't that expensive, and gave me peace of mind with all new seals.

    Yes, replace the rear seal while you're at it. There's no reason not to do that.

    Casey
    1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter

  4. #4
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    Trabuco Canyon, CA.
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    OK, Any idea if rear main seal is one-piece, or two piece?
    Thank You as always!
    '94 K2500, '82 VW Veggie Cady (sold), Standby: '99 E-350 gasser, Racer: 1964 Front Engine Dragster on E-85.

  5. #5
    Join Date
    Jan 2001
    Location
    Knoxville,Tennessee
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    2,545

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    if your up to tackling the transfer case your self drivetrain.com is excellent for parts and would have the correct converter for your trans. Those guys even answer the phone on weekends and are very knowledgeable and helpfull.
    "The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government."
    -Patrick Henry


    A5150nut
    2006 K3500 D/A
    94 6.5 4x4 5spd Sold

  6. #6
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    Granby, Missouri, USA
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    Quote Originally Posted by The Munz View Post
    OK, Any idea if rear main seal is one-piece, or two piece?
    Thank You as always!
    Factory 6.5L in 1994 would be a one-piece seal. You would HAVE to remove the transmission to replace it, so it's definitely worth doing with the transmission out of the way anyway.

    Casey
    1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter

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