K5 Blazer 1969-1994
While this model ended its run, it is not uncommon to see them on the road or off, years after production end.
Platform: Truck, GMT 400

rumbles when idling

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Old May 8th, 2024, 6:25 AM
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Default rumbles when idling

Hey yall,
for reference, I drive a 1990 Chevy K5 Blazer with a 6.2 Detroit Diesel (w/h a turbo) on it I had a new (built) 700r4 Transmission installed on it a few days ago, and one thing I've noticed is that it rumbles a bit loud when idling and even louder when in gear (reverse, drive, etc)

(This is the 700r4 currently installed on it: https://gearstar.com/gm-700r4-performance-transmission-level-3 )

What could it be? I've driven it around local roads and on the freeway and it shifts properly (1st to 2nd has a very slight kick to it since it is built) but I don't know why it rumbles as so, any input would be highly appreciated

(Video: https://www.reddit.com/r/Squarebody/s/g806b79N8Z )
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