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Thread: 1983 Seirra

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  1. #1

    Default 1983 Seirra

    This Seirra has 47,000 original miles. It has a 305 with a 700r4 transmission. It was all original until I did the following modifications, replaced the manifold with an [COLOR=blue! important][COLOR=blue! important]Edelbrock[/COLOR][/COLOR] Peformer, installed 60,000 volt distributor, installed headers.

    Since these modifications my transmission slips while shifting into 2 & 3rd when excellerating to fast, after shifting it works fine and doesn't slip. It will shift fine if I let up on the [COLOR=blue! important][COLOR=blue! important]gas[/COLOR][/COLOR] as I reach the shift point.

    Could any of my modifications cause the problem or is the [COLOR=blue! important][COLOR=blue! important]transmission[/COLOR][/COLOR] having problems

  2. #2

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    welcome to the site!

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    Legend Mean_Green_95's Avatar
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    I would say that for the age of the vehicle, getting some more power might be the culprit. But Idk...
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    Welcome to the site!


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    Legend bry2500's Avatar
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    Welcome to the site!!!!!!
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    Legend kgibson181's Avatar
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    Welcome to the site! Got any pics of the Sierra? Post em up if you do

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  7. #7

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    Welcome to the site!
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  8. #8

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    Welcome. Those 700R4's were a PITA.Try re-adjusting the TV cable first. That's a more common issue for bad 3rd and 4th gear shifts. Sometimes you need to replace the cable.. it's 30 bucks generally.

    Second the throttle valve on those can cause issues, mostly of them wanting to stay ion lower gears. Shift kits are relatively cheap. I would flush it with new fluid and inspect the filter. If it looks decent, add the shift kit while you have the pan off and that will most likely solve your issue.

    If neither of those two work, the 3-4th gear clutches commonly go bad in the 700R4's which means a rebuild to repair.

    Give the first two a shot though, you'll probably solve it with those.

    --Joe

  9. #9

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    Welcome to the site!
    The diference between stupidity and genius is that genius has limits.

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