Quality used gear housing for a Cummins ISB 5.9, ISB CM550, QSB5.9 44 CM550, Low Cost, Warranty, Fast Nationwide Shipping!

Please note that the part sent may not precisely match the one shown in the picture. Appearance may vary. For specific part requests, contact us. An additional core charge may apply.

OEM # 3976697, 3943379, 3941532

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