Flush or Replace OEM transmission cooler

Discussion in 'Transmissions' started by CHEVYS4ME, May 28, 2020.

Should I Clean/flush, or Replace auto trans cooler?

Poll closed Jun 6, 2020.
  1. Clean/flush it

    40.0%
  2. Replace it

    60.0%
  1. df2x4

    df2x4 Domestics only.

    Messages:
    7,191
    Likes Received:
    3,472
    Joined:
    Mar 1, 2012
    Location:
    Missouri
    It's part of their LPD line, not sure which feature you're referring to specifically though.

    https://trucool.com/products/tru-cool-lpd
     
  2. 454cid

    454cid Sooper Pooper

    Messages:
    3,094
    Likes Received:
    917
    Joined:
    Sep 5, 2010
    Location:
    The 26th State
    Until I started poking around, due to this thread, I didn't know that Tru Cool is part of Dana. I could not find a Long Mfg that made coolers, so I wonder if maybe they were absorbed.
     
  3. alpinecrick

    alpinecrick I'm Awesome

    Messages:
    605
    Likes Received:
    387
    Joined:
    Jun 12, 2015
    Location:
    Western Slope of Colorado
    After reading the website more closely, it llooks like the M7B has the low pressure drop. Most tube and fin don't have that feature, and some stacked plate coolers don't have it either. The factory trans cooler (which is appears identical to the Tru Cool L7B ) has the LPD feature.
     
  4. LauraT

    LauraT Newbie

    Messages:
    2
    Likes Received:
    1
    Joined:
    Apr 9, 2020
    Location:
    Birmingham Alabama
    I rebuild these all day everyday and my thoughts on it are first ...what did the fluid and bottom of the pan look like on the last transmission?...if there was any bits of metal or anything besides normal clutch material in the pan hands down replace it because no matter how good of a flush you think youve done a shops done a big huge machine or chemical dissolver has done or promised ....if you cant open that cooler up and see that its clean then trust me its not....little chunk of metal hanging out in the corner...for months days ...fluid changes ...even a trans change ...and then one day it decides it wants to go for a walk down tbe cooler line ...and boom transmission is done ....
    On the other side ...if it was normal clutch material ...there isn’t significant rust present on the connectors or leaking ...and when looking into the lines or the connections you dont see a big nasty build up then reuse it with caution. Make sure to blow the lines thoroughly ...if youndo not have an air compressor a bicycle pump with the pointed attachment works just fine as well.
     
  5. LauraT

    LauraT Newbie

    Messages:
    2
    Likes Received:
    1
    Joined:
    Apr 9, 2020
    Location:
    Birmingham Alabama
    YES PLEASE DO NOT BYPASS THE RADIATOR....the term AUXILIARY means basically “in addition to” not “instead of”
     
    Hipster likes this.
  6. Schurkey

    Schurkey I'm Awesome

    Messages:
    1,806
    Likes Received:
    975
    Joined:
    Jan 14, 2018
    Location:
    The Seasonally Frozen Wastelands
    The converter pushing forward will tear up the REAR thrust bearing.

    Did you wreck the front, or the rear thrust bearing?

    Is the crank any good?
     
  7. CHEVYS4ME

    CHEVYS4ME Supporting Member

    Messages:
    49
    Likes Received:
    10
    Joined:
    Apr 16, 2020
    Location:
    Santa Clara, CA United States
    Metal appears to be coming from rear lip of the front thrust bearing. I don't have it apart. Still concentrating on getting new engine built, and truck back on the road
     
  8. Schurkey

    Schurkey I'm Awesome

    Messages:
    1,806
    Likes Received:
    975
    Joined:
    Jan 14, 2018
    Location:
    The Seasonally Frozen Wastelands
    Post a photo. I can't keep your front/rear straight.
     
  9. CHEVYS4ME

    CHEVYS4ME Supporting Member

    Messages:
    49
    Likes Received:
    10
    Joined:
    Apr 16, 2020
    Location:
    Santa Clara, CA United States
    I changed my trans cooler over to the M7B today. Upon inspecting, I found my truck has the exact same size cooler as the M7B. My stock one is the exact cooler, but with OEM flared fittings. I wish I would have looked at mine first, I would have rather just bought an OEM cooler that I didn't have to change fittings to use. My truck is a late production 1992 C1500 5.7l extended cab. My options tag says Heavy Duty Radiator, but no tow package. I'll post up pics tomorrow.
     
    454cid likes this.
  10. alpinecrick

    alpinecrick I'm Awesome

    Messages:
    605
    Likes Received:
    387
    Joined:
    Jun 12, 2015
    Location:
    Western Slope of Colorado
    Then somebody has already changed your cooler because the factory external cooler dimensions are the same as the L7B (5 3/4” x 11”).
    The M7B is 8” x 11”.
     
    df2x4 likes this.

Share This Page