Gm Bellhousing # 9785581 For Buick, Olds & Pontiac (bop) on 2040-parts.com

BOP Bellhousing offered for sale is crack-free, in good condition with some external aluminum oxidation from being stored inside. Known/Observed defects are some pitting on lip around gravel guard flange as pictured and two 1/2-12 heli-coils as pictured that were installed on clutch fork side of Bellhousing for GM Tranny Install.  Balance of threaded-holes are OEM and no repairs are noted.  

 

Will media blast this bellhousing with aluminum-oxide in blast cabinet for an additional $30.00, please request this additional service to be performed if you are you are the winning bidder and add $30.00 to your winning bid and allow one additional day for shipping.  

 

General Motors Bellhousing Part Number 9785581 

 

The B.O.P. "581" is an all aluminum bellhousing. These clutch and flywheel assembly covers were manufactured for multiple applications, as evidenced by two starter housings and dual transmission mounting bolt patterns. In 1965 General Motors used Dearborn built (Ford) 3 speeds as a heavy duty option to the Muncie 3 and 4 speed trans on some models. Instead of casting different bells they made these more universal. See the two trans mounting bolt patterns. Four holes tapped 7/16"14 for Ford 3-speed manual transmissions and four tapped 1/2"12 for the optional GM production trannys. Although the housing looks skewed the General Motors transmission bolt pattern is parallel with the upper engine mount holes and the gravel guard flange. The "V" in the engine mating flange and is indicative of a Buick, Oldsmobile and Pontiac clutch cover. There are two 1/4" x 1" slots above the transmission mounting surface and another smaller one on the engine mounting flange. Fork side The fork hole is 2 1/4" x 3" and accepts the "355" clutch fork boot. There are two 3/8"16 taped holes for the B body Z-Bar bracket.  Bottom These bells utilize a one piece sheet metal inspection cover that wraps around from engine side to bottom, and is attached by three 1/4"20 bolts. Passenger Side View Passenger side is unencumbered except for the Buick starter bump. Engine Side View Here you can see the two starter "ears" and the engine mounting flange, with six clearance holes for bolts and two dowel holes. The starter "ear" on the right is for Oldsmobile and Pontiacs while the "ear on the left accepts Buick starters. 

 

 GM# 9785581 Applications 

 

 PONTIAC All 1965-75 V-8 M.T.(Pontiac) exc. 307 

 

 BUICK 1968-69 350/400 Eng.(Buick) 

 1970-73 All V-8 C.T. (Buick) 

 1976-77 A, X-body 231 V-6 (Buick) 

 1977-78 X-Body (M15) (Buick) 

 

 OLDSMOBILE 1964 F85 V8 S.T. (Olds) 

 1965-75 V8 S.T. (Olds) 

 1966-74 Irrig. Eng. (Olds) 

 1975 260 Eng. S.T. (Olds) 

 1976-77 All(260) (Olds) 

 1977 A-Body (V8 & 6cyl) (Olds) 

 1977-78 X-body W/M.T.(M15) V8 & amp; 6cyl (Olds) 

  Disclaimer: Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason. (no production interruptions at any cost)