454+th350 strange rattle

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N

northern

Junior Member
Joined
Oct 23, 2019
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Location
Finland
First Name
Tuomas
Truck Year
1977
Truck Model
Chevy Suburban c20
Engine Size
350
Here is video with manual shifting- noise is gone.

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T

trukman1

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Location
USA
First Name
Gary
Truck Year
1988
Truck Model
K5 Blazer
Engine Size
5.7 L (350)
Odds are this isn't going to be it but my K5 rattled only in reverse. Thinking it was in the tranny I took it to shop. Rattled next time I drove it. My son got under it and discovered the tranny wasn't bolted firmly to the rear of the engine. Tightened loose bolts and no more rattle. Worth a look though. Good luck!
 
N

northern

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Joined
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Posts
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Location
Finland
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Tuomas
Truck Year
1977
Truck Model
Chevy Suburban c20
Engine Size
350
I think i found the culprit. Trans cooler lines (stock steel ones) were in direct contact with motor mount! I must had bent them when i removed the tranny when i tried another converter, easy fix, took me whole minute to bend them back. Thanks everyone for all sort of ideas!
 
N

northern

Junior Member
Joined
Oct 23, 2019
Posts
11
Reaction score
2
Location
Finland
First Name
Tuomas
Truck Year
1977
Truck Model
Chevy Suburban c20
Engine Size
350
It wasn't the cooler lines. Whoah. It sure is a tricky one. Something loose somewhere maybe.
 
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