1990 Chevy Silverado third tranny going out.

Tiny
TWEBB6
  • MEMBER
  • 1990 CHEVROLET SILVERADO
Transmission problem
1990 Chevy Silverado V8 Two Wheel Drive Automatic

ok so I bought this truck off of my cousin. When he bought this truck he had to replace the transmission. So there is number one. I bought the truck off of him and the transmission that he had put into the truck started slipping and then within a day went out. So I bought a transmission and it was already bad so that one doesnt really count but the transmission I have in it now worked great for about 3 or 4 days. Then all of the sudden the same thing that happened to the past two working transmissions happened to this one. What my dad's friend said(a transmission specialist) was that the 3-4 clutch had gone out. Is this just some sort of bad luck that im going through that all of these transmissions have a bad 3-4 clutch or is there something that could lead to this problem occurring? Ive checked to make sure the fluid runs through the cooling system and I have put a new filter and gasket in each transmission in hopes of that helping with the transmission to work. Yet the same problem has happened with each transmission. Im at a loss of thought and have no idea what to do. Should I just keep buying more transmissions or is there something else that could cause this. It is a 700r4 transmission 4speed with electronic overdrive.
Sunday, September 5th, 2010 AT 6:06 AM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

I would be suspecting a partly blocked transmission cooler, I have seen this on other cars, it still may have flow but it may be insufficient, I would take a critical look at the cooler first, if in doubt fit a new one to be sure, they should be replaced after any transmission failure.

Mark (mhpautos)
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Sunday, September 5th, 2010 AT 8:31 AM
Tiny
MARINE18
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Is your truck carburated? If so, there are kits called "kick down" kits that you need or you will burn up a transmisson.
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Sunday, September 5th, 2010 AT 9:24 AM

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