You need a paper thin gasket between the differential and the housing. Thickness does not matter between the housing and rear cover.

I use Permatex gasket maker on the differential side.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.