Allis-Chalmers 808 GT II transaxle ID--Whatizzit?

[totallymopar]

I have an Allis-Chalmers 808GTII,circa around 1976-82.has 8 HP B&S engine and 3-speed+reverse H-pattern transaxle. I've never seen a transaxle like this.(photo included).Its oval shaped,and rather flat,like a fat pancake,sits pointed vertically at an angle,and offset from center. A 9" pulley mounted on the shaft which comes out the side.I can't see a tag or label to ID it--coated with greasy dirt. I want to know who makes it,and what gear ratio it has,so I can add the appropriate pulley to it. Would like to do around 20+ mph with it.
[ATTACHREUSE]

 

[StarTech]

Same as the Simplicity 1680454 model wise.

IPL does not indicate who made the transaxle so very carefully clean the dirt and grease off to reveal the tag. A lot of the parts from Briggs are not available.