Gasbox Chopper Big Twin Frame

Full rigid frame for Harley Big Twin engines 

Ideal for Shovelhead and Evolution engines. Will also accept Panhead engines.

Twin Cam style "A" engines will also work with the use of a rear engine mount adapter plate. 

This frame has 3" of upward stretch in the neck with a 32 degree rake. And the back bone is raised to accommodate an S&S Stroker engine. 

The frame is designed for a 3/4" Stock rear axle #41110-79A

Frame come with the horseshoe oil tank mounted.

You must choose your transmission type, 4 or 5 speed.

• 4 Speed Harley style transmissions, used between 1936 and 1985. 
• 5 Speed Harley style transmissions, used between 1985 and 1999 from Softail models only.
• Must buy transmission mounting plate separately. 

You must also choose your gas tank mounting style. Either "Frisco" style, which is  through the top of the back bone with threaded bungs.

Or "Sporty tank" style, which is through the sides of the back bone and front gusset with through holes. 1957-79 stock sportster style mounting. 

Frames are made from 1" and 1 1/2" tubing and TIG welded in Cleveland Ohio.

Frames include an MSO that you will receive separately in the mail after ordering.