New (built) 700r4 rumbles when idling, what could it mean?

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jeremy99

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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 )
 

NickTransmissions

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Hey yall, for reference, I drive a 1990 Chevy K5 Blazer with a 6.2 Detroit Diesel (w/h a turbo) on it
How do you know the "rumbling" is coming from the transmission?

Also, what did Gearstar say when you contacted them?
 

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