CLASS RACER FORUM - View Single Post

ss3011 · 06-07-2025, 09:31 PM

The mail trucks used to come with a 153 4 cyl, and a THM 180, which is a 3 spd made in Europe, mostly for Opel. When that trans was discontinued, that is when the 904 with the Chevy bell was created. The 180 was replaced with an overdrive added on, basically a 200-4R overdrive gearset was added between the converter and the 180. That is the trans that GM sold to BMW, and the OD ratio was slightly reduced to .72 ish.

06-07-2025, 09:31 PM	#8
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 908 Likes: 70 Liked 238 Times in 113 Posts	Re: Chev bolt pattern 904? The mail trucks used to come with a 153 4 cyl, and a THM 180, which is a 3 spd made in Europe, mostly for Opel. When that trans was discontinued, that is when the 904 with the Chevy bell was created. The 180 was replaced with an overdrive added on, basically a 200-4R overdrive gearset was added between the converter and the 180. That is the trans that GM sold to BMW, and the OD ratio was slightly reduced to .72 ish.