Question about 1990 Chevrolet K1500

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Transmission shift issue (700R4) 1990 4x4 siverado 5.7

Hello, Have a 1990 5.7 chevrolet silveroda 4x4, trans will not shift out of 1st gear. I have full time hot with ignition on to the transmission for 2 wires,(700R4) but when the brake is applied i loose power at the purple wire. The brake switch seams to be ok, due to the brake lights do not stay on, the ABS modual sounds like loose sand inside. Would this be my problem. There seems to be a drain in the electrical system. I have already removed govenor and cleaned and reinstalled, removed pan cleaned and reinstalled with filter and correct amount of fluid, re adj the tv cable from what i believe is the correct setting, help on this correct setting specs would be appreciated. Any helpful advised would be much appreciated.

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  • mymustange Feb 18, 2009

    The transmission will not shift into second gear, manually, or on its own. It will do low 1st and 1st gear only. When trying to manually shift it with shift lever to second, or drive, or overdrive, it will not come out of first gear. There is a transgo gasket in the transmission on the valve body, and the torque converter is blue, this is not all stock, and appears as if it may have been recently rebuilt. I am trying to determine where my problem may lie with this issue, I have tried the freeing up the tv cable method of pulling cable out fast several times while running. However im wondering why the brake light switch is sending constant 12 volts to the transmission until the brake petal is applied. Would this be due to a computer safe mode, or a faulty abs sensor. Why will my transmission not shift out of second gear????

  • Kelley Duncan May 11, 2010

    Any hints of behavior before this would be helpful.

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5 Suggested Answers

  • 38 Answers

SOURCE: transmission

Yes it does matter. Remember your filter is a screen that the oil flows over. If it is clogged it will not allow clean oil past it and to some extent will be like you are low on oil or high if the oil can not flow.
Change the filter and look for metal deposits in both the fluid and the filter. Minute shavings like sand or smaller is normal as long as there is not a lot. If you see a lot or see big particles then gears have been ground and you are looking at trouble. Get fixed early. Otherwise if filter is clean and fluid is fine and tranny still does this they make additives for tranny's to help with slipping. I use tranny medic. Follow the directions as you will need to drain some of the fluid out. Also do not add to your tranny unless you have met or exceeded the mileage specs on the bottle of the tranny medic. Hope this helped.

Posted on Sep 12, 2008

  • 14036 Answers

SOURCE: automatic transmission will not shift out on my '92 chev silverad

check the governor for sticking valves drive gear worn.governor weights or springs binding.check 1-2 shift valve sticking.check the 2-4 band damage or worn band or band not engaged in anchor pin.

Posted on Apr 21, 2009

juncro
  • 467 Answers

SOURCE: 1997 chevy k1500 pickup-transmission shifting problems

check the fluid level in the transmission, also change the transmission fluid and filter

Posted on Jul 30, 2009

  • 2 Answers

SOURCE: 1997 Chevy 1500 P/U 4x4 small V8. Transmission shifting issue.

you may be confusing the torque converter clutch engagement with o.d. this trans has a problem with the T.C.C. regulator valve wearing out the valve body bore. this will cause the converter clutch to engage only sometimes or not at all. this will set a P1870 code in the control module. when this code is stored in the controller, ( check engine light may or may not be on), it increases the pressure in the transmission causing the 1-2 shift to be harsh. ask a local tranny shop to scan the vehicle ( most will do this for free) if this is the problem they can either fix your valve body (sonnax parts) or replace it with an upgraded valve body. hope this helps

Posted on Dec 16, 2009

  • 468 Answers

SOURCE: automatic transmission will only shift manually

This is a sensor issue. It can be from a couple of different sensors. The VSS, or vehicle speed sensor is the main one. Loose or faulty wiring can cause it, a faulty PCM can cause it, or the Throttle Position Sensor can cause it.

Posted on Jul 31, 2010

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