75-76 Aluminum 833 4 speed Overdrive trans questions ?

Brooks James said

I have 2 identical aluminum 75-76 aluminum a body 833, 4 speed transmissions, one complete with factory shifter and rods
1. How much hp/torque will they handle
2 How much with modifications
3. Weak links/poor engineering
4. Availability of parts
5. Reliability/durability
6. Value
7. Requires its own bell housing ?

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Parts are no problem. The O/D can be 26 spline output or 30 spline output. I personally prefer to swap the aluminum case for an early 64-67 cast iron standard 4 speed case with a 307 front bearing and run the standard countershaft as opposed to the O/D countershaft. Been running one in the 66 Formula S for years giving my 3.91 gears a highway ratio of 2.78. The bell housing also depends on the front bearing, 307 or 308. Some of the early O/D used a 307 front bearing. And because of this, all you have to do is swap the standard front bearing retainer onto the 307 case and pop the trans into any A-Body bellhousing. I know of at least one O/D gearset in a 440 6 pack doing fine. He also just added the O/D gear set into his original 4 speed case. He may have had to grind clearance in the case for the large O/D gears. The early cases have worked fine, so far, without grinding clearance.