Question about 1995 Chevrolet Tahoe

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Automatic transmission not shifting, starts in higher gear

I have a 1995 Chevy Tahoe, 4wd w/a 350. I just replaced the rear axle and now the transmission does not seem to be working properly. I noticed that when I take off there is no power so I manually downshifted and gained some power. It seems that the transmission is starting off in 3rd or overdrive. When I downsift, it will go down to second, even when I manually shift to first it only goes down to second. I checked the fluid, seems to be overfull according to the dipstick or the fluid is overheated and bubbling up. I have no idea why this is happening as no fluid was added when I changed the rear axle.

Is there a linkage that could've slipped loose and be causing this or does this sould like an internal transmission problem?

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  • lakespyder Sep 27, 2009

    Thanks for your response. How do I test to see if it is a modulator?

  • lakespyder Nov 17, 2009

    No modulator on does use a shift silenoid which is located in the transmission. I have tried to search to see what the symptoms of a failure in this silenoid would be, but have not been able to come up with an answer.

  • lakespyder Nov 17, 2009

    Unit I replaced it with was from salvage yard and had all the same parts as my old one. Everything hooked right up. The gear ratio is the same. I did drive it a little with the drive shaft removed prior to replacement, that is when I noticed the problem begin, not after replaement of the rear end.



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Did you transfer the speed sensor from your old rear end to the new unit, if not do it. Also didn't you change the gears in the rear end?

Posted on Nov 16, 2009

  • cool85 Nov 17, 2009

    You may want to still try your old speed sensor? Also your modulator is behind the glove box near the ecm. I had to replace my modulator also because was having a similiar problem. The box is white and the size of a mans wallet. Is your ABS light coming on?


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Could be modulator

Posted on Sep 26, 2009

  • rchapman24 Nov 17, 2009

    check linkage and vacuum line chaging rear end will not the down shifting



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