Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Engine cause tranny failure?

Discussion in 'The Garage' started by Citizen Rider, Jan 13, 2007.

  1. Citizen Rider

    Citizen Rider 1/2 ton status

    Joined:
    May 5, 2005
    Posts:
    1,415
    Likes Received:
    0
    Location:
    Plano, Texas
    I bought my blazer in feb of last year, and from feb to august, i went through about 3 rebuilt transmissions. The tranny that is in it now i got from Mattk here on the boards, he had a very similar setup to what i have, and he never had any troubles. It was rebuilt just over a year ago. It seems to be on its last leg, and its barely been driven, and has not been offroad while in my rig.

    So im possibly going on 4 blown TH350's in less than a year. 1 was a sprag broke and would lock up the tranny in 2nd. Another it just exploded everything inside the case.

    My question is, could there be something internally wrong with my engine that would cause ANY transmission that has been installed on my blazer, blow itself up within a couple months of very short driving and little wheeling?

    :doah:
     
  2. CDA 455

    CDA 455 3/4 ton status

    Joined:
    Jun 2, 2006
    Posts:
    8,598
    Likes Received:
    0
    Location:
    43rd State
    How about the drivers' driving habits? Incorrect installation?

    Disclaimer: This is just a WAG :D !
     
  3. Col_Sanders

    Col_Sanders 3/4 ton status

    Joined:
    Apr 27, 2005
    Posts:
    5,688
    Likes Received:
    1
    Location:
    KFC
    How is the rest of your drivetrain?

    Have you pressure tested the tranny when you install it? Maybe your cooler is clogged?
     
  4. Chaddy

    Chaddy 1/2 ton status GMOTM Winner

    Joined:
    May 23, 2005
    Posts:
    4,110
    Likes Received:
    2
    Location:
    Salt Lake City,Utah
    Has your torque converter expanded?
     
  5. Leper

    Leper 1/2 ton status

    Joined:
    Feb 18, 2005
    Posts:
    4,437
    Likes Received:
    0
    Location:
    Dallas Baby!!!!
    If the main bearings are worn, and the crank is walking back and forth, it will cause tranny problems by mashing the TC into the trans.
     
  6. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,584
    Likes Received:
    945
    Location:
    Massachussetts
    X2!..

    Yes,if the thrust bearing surfaces on the crank or main bearing that controls the amount of end play in the crankshaft wear ,it lets the crank push on the converter,which usually ruins the pump in the tranny first..but the main cause of thrust bearing wear comes from the torque converter,when it "balloons" due to clogged cooler lines, or other internal causes,or lugging the truck under heavy loads constantly,as when towing uphill...

    In general, a poor running engine can cause tranny failure--low or eratic vacuum affects the modulator,causes line pressure in the tranny to be too low,and can cause slippage of the clutches..it also heats the converter up more if the motor is running poorly..

    But I have swapped good engines in place of bad ones in many vehicles,and the tranny still worked fine--better in fact,than they acted with the poor runner bolted to them..I'd suspect you have other things on your truck adding to the tranny's problems.(big tires,high gears??)..its rare to pop 3 in a row,with similar failures,unless they were on their way out before you installed them..:crazy:
     
  7. koldsimer

    koldsimer 1/2 ton status GMOTM Winner

    Joined:
    Jan 10, 2005
    Posts:
    1,480
    Likes Received:
    0
    Location:
    texas
    Hey! Did you hear that? I could of sworn I just heard something.

































    465/205:D


    I knew I heard something.
     
  8. Citizen Rider

    Citizen Rider 1/2 ton status

    Joined:
    May 5, 2005
    Posts:
    1,415
    Likes Received:
    0
    Location:
    Plano, Texas
    First 2 trannies it didnt help i had 10bolts, 3.08 gears, and 38's, although it actually had decent amounts of power and movement.

    Now i have a transmission that came out of a 79 blazer with 4.56's and 37's with no problems and a rebuild just over a year ago. I run 4.56's and 38's. Tcase came out of a running truck, axles came from a running truck. My engine has had slight problems here and there, but im really wondering if theres more than the eye can see that is wrong.
     
  9. MattK

    MattK 1/2 ton status

    Joined:
    Jan 12, 2005
    Posts:
    1,713
    Likes Received:
    0
    Location:
    Dallas, TX
    the power of the granny compels you!
     
  10. JEBSR

    JEBSR 1/2 ton status

    Joined:
    Dec 23, 2004
    Posts:
    1,541
    Likes Received:
    0
    Location:
    Clarksville, TN
    I have a silly question for you. Did you flush the lines and cooler or are you recirculating metal through the new tranny's from the old? I have seen this happen on a few occations. We had a TH400 in a friends car that kept going out and when we finally asked him this question he told us he was just pulling old out and putting new in. When we flushed his system we filtered it and you would be amazed how much metal was in the system. Flushed it and reinstalled 10 years ago now. Still running strong.
     
  11. JanneB

    JanneB Registered Member Premium Member

    Joined:
    Dec 9, 2004
    Posts:
    62
    Likes Received:
    5
    Location:
    Finland
    And the converter, flushed or replaced?
     
  12. Citizen Rider

    Citizen Rider 1/2 ton status

    Joined:
    May 5, 2005
    Posts:
    1,415
    Likes Received:
    0
    Location:
    Plano, Texas
    Each time exept for the one in it, the converter was new. I reused the converter from Mattk's setup.

    Also everytime the lines have been flushed. I also now run a perma-cool inline filter/temp guage. So through the filter, into an after market tranny cooler, and back to the tranny.
     
  13. koldsimer

    koldsimer 1/2 ton status GMOTM Winner

    Joined:
    Jan 10, 2005
    Posts:
    1,480
    Likes Received:
    0
    Location:
    texas
    You gotta get this figured out man. We must wheel soon! Based on others suggestions, i'd say it's either excessive crankshaft play or something with the TC. Hmmmmm.
     
  14. Citizen Rider

    Citizen Rider 1/2 ton status

    Joined:
    May 5, 2005
    Posts:
    1,415
    Likes Received:
    0
    Location:
    Plano, Texas
    I have no clue where to start from here. I cant stand having it sit infront of my house.
     
  15. JEBSR

    JEBSR 1/2 ton status

    Joined:
    Dec 23, 2004
    Posts:
    1,541
    Likes Received:
    0
    Location:
    Clarksville, TN
    If you have a dial indicater, you can measure the endplay at the flexplate. Look in a good repair manual and see what the endplay should be, gently pry the crank forward, set the dial indicator and zero it, pry the crank back and see what the reading is. It would have to be very excessive to damage anything other than the pump though IMO.
     

Share This Page