AR89594 Muffler w/ Vertical/Oval Body Fits John Deere Tractor 8440 8640One New Aftermarket Replacement Fits John Deere Muffler that fits Tractor models: 8440, and 8640. Vertical Oval Body 8" x 11 1 2" Shell Dimension Muffler has Curved 1 1 2" O. D. Aspirator (Ref. G) Dim A (1) A: 3 1 2" Inlet Length Dim B (2) B: 3 15 16" Inlet I. D. Dim C (3) C: 30" Shell Length Dim D (4) D: 5" Outlet Length Dim E (5) E: 5" Outlet O. D. Dim F (6) F: 38" Overall Length Stanley Muffler