Noise at first to second gear shift.

[evil_twin]

Trying to figure out what the noise is. I haven't noticed it until today driving through a parking garage. I have a fully rebuilt Monster Transmission, that was installed last year and the truck doesn't get driven much.

It sounds almost like a rattle, or electronic buzzing?. I only hear it between 1st and 2nd gear shifts. Anyone know what it is?

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[4WDTRK]

I was having a similar issue a few years back and it ended up needing a torque converter. Do you know if that was replaced when your tranny work was done?

 

[evil_twin]

Yea they put a higher stall TC in. I noticed when the car is cold, the noise isn't there, its only after it warms up.