thuding sound under seats in drive train

[2 mazdas]

i bought a wrecked 94 mazda b-4000 4x4 and before i had the front frame horns straighted it did not have this thudding sound under seats looked all over underneath nothing rubbing anywhere that i can see do you have any suggestions do you think tranny mount or carrier bearing by chance let me know if anyone has any ideas thanks

 

[JamesC]

I had that noise when my radius arms and bushings were worn.

 

[AllanD]

Under the seat?

check directly above the rear output of the T-case

With sagged body mounts in a supercab the rotating
t-case flange can just touch the rib under the floor and make
a witness mark only about the size of your pinkie nail

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