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The model archive
Simpson Jumbo
Explore 2 farm tractor models. Follow a model into its engine specifications, transmissions, dimensions, historical photographs, and available test records.
About Simpson Jumbo
Jumbo Steel Products of Azusa, California, built Simpson-branded tractors after World War II. The machines resembled Custom tractors and used Chrysler industrial engines.
- Beginning
- Postwar production; opening years reported around 1947
- Founder / origin
- Individual founder not established by the reviewed source
- Known for
- Automotive-component farm tractors
- Sale / later history
- Factory sold to American Brake Shoe in 1952; final tractor date uncertain
History and legacy
A manufacturing license from Custom is possible but not confirmed by the source. Published end dates range from 1949 to 1955, so the factory sale and an exact last tractor year are not presented as the same settled event.
Sources & further reading
History reviewed 2026-10-20.
Showing 2 of 2 models
B
1947–1949
Power not listed
No index power figure
2WD Only
Drive
C
1947–1949
Power not listed
No index power figure
2WD Only
Drive
Index power values can include estimates derived from belt or PTO power. They are identified on each model card and are not interchangeable with a measured engine rating. Model years and missing values follow the source index.