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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Jon87V20 on December 09, 2016, 06:19:07 pm
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Hello!
1987 Suburban V20 350/TH400/NP208
I'm about 99% sure the issue with my TH400 is the front pump.
Does anyone know, can anything else become damaged from the pump not operating correctly for say a week or so of driving?
Basically, it was shifting funny for about a week, then it started making a loud whining noise when cold (it would clear up after a few minutes), then eventually it couldn't get to third gear while under load, was slipping etc. for about 15 minutes until I was home. It could still move it self when I parked it in the garage.
I'm trying to figure out if I can swap in a new pump and it'll be all good, or if I'll get it back in the truck and there'll be other damaged components as a result of the pump failure.
Thanks!
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Typically TH-400 pump failure is breakage not intermittent pressure. What you describe is either the result of low fluid level or it's most likely time for a rebuild. Replacing the pump without a diagnosis would not be advisable.
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Thanks, Vile.
Bummer I was hoping that's what it was. After looking around I found a video on YouTube, the guy had the same noise as I did and said it was the pump.
https://www.youtube.com/watch?v=lIqLVcuw31E
Is it a safe bet to pick up one of those rebuild kits on eBay?
I couldn't have someone else rebuild it for the foreseeable future due to my financial situation, but I don't want to let the truck die. My concern with buying one of those rebuild kits is I don't know if they come with everything, and the bad components may not be replaced in the rebuild.
I've also considered junkyard transmissions but I can't afford to pick one up from the yard and have it not work and have to get another one.
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Check the fluid level, if okay, drop the pan, check the filter and pick up tube/o-ring. Examine the contents of the pan. there's a good starting point for you.
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Ok I'll try that. Thanks for the help, Vile!