Question about 1985 Chevrolet Monte Carlo

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I have a 1985 monte carlo ss, lately the transmission has been shifting smoother than normal but at higher rpms, it used to shift a little rugged but at the correct rpms, what kind of problem am i looking at and is it an expensive fix or a diy fix?

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  • Edward Snow Mar 20, 2011

    strange but now my car is shifting normal with no trouble at all... gonna take it to a shop and have it looked at

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The transmission used in that car usually has a firm positive shift. (rugged?) If the shifting seems to be smoother, could be that you have a small amount of internal pressure loss from worn seals.
Only two options there. You can try changing the fluid and adding a good additive like lucas sealer and conditioner and see if it comes back to normal after a few days, or, have the unit checked by a reputable trans shop, They will likely rebuild it. Changing internal seals requires complete teardown so it is foolish to only replace them without changing the clutch packs.

Posted on Mar 11, 2011

Testimonial: "thank you and yes i meant firm when i said rugged, i will try changing the fluid and using an additive because i do not have the money for a rebuild."

  • Richard Scordino Mar 20, 2011

    On a unit that old chances are there are some varnish deposits that are causing the valves in the valve body to hang up. That's why I recommended a fluid change and lucas additive. Some additives contain a chemical that swells the clutch material and causes it to come apart. Lucas won't do that but will help clean deposits gradually so as not to block up the filter. If you have a shop look at it, perhaps they can remove and clean the valve body. The trans does not need to be removed to do that. Don't try that at home as there are check balls inside and if one gets lost or you put it in the wrong place or, if even a small piece of sand lint etc gets in there it won't work right.

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