I can't say what GMC did, but Chevrolet had the big tank in the big trucks...assume GMC did as well.

Yes, you'll need to find one used as the are not being reproduce...make sure you get the filler neck with it as they are different than the small tank necks ...

Mike B smile

Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD