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Old 11-19-2008, 04:51 AM
enigma57 enigma57 is offline
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Default Torque Capacity - A-833 OD transmission?

Hi, guys! I have a '76 A-833 overdrive transmission original to a Dart with 318 engine. This is the A-833 OD that has the cast-iron gear case, so I would imagine that it might be a bit stronger than the later aluminum gear case versions. But thus far, I have found no specs addressing torque capacity for these transmissions.

I would like to use this transmission behind a 'built' 426 wedge engine if it will hold up to high performance road (and occasional track) usage. What do you think?

Thanks for your assistance,

Harry
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Old 11-19-2008, 06:09 AM
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dwc43 dwc43 is offline
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Biggrin

It's the same as the A833 23 spline tranny. They just flipped the 3rd and 4th ratios to get the o.d. ratio. It might be o.k. behind a 426, but I'd rather use the Hemi 18 spline A833 instead just to make sure.
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Old 11-19-2008, 11:11 AM
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rumblefish360 rumblefish360 is offline
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I'd save it for the grocery getter car and use the standard 4spd. The problem isn't the case material, though I would avoid aluminum for this particular build, it is actually the problem of how they set up the gear workings inside the tranny.

3rd and 4th gear levers are swaped. That should send up alarm bells. WHY?

3rd gear is now a 1-1 gear riding on the full stregth of the trans and shaft. Now that 4th has become 3rd, it's not riding (Internally) on the tranny strength but on the weaker side of the gears and shafts.

You would be very wise to contact Jamie Passon @ passonperformance for his expertise on this tranny.
IF you NEED an overdrive ratio for 4th gear, he can help with gears for the 833 and keep 4th gear where it belongs.
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Old 11-19-2008, 02:43 PM
43 purestock 43 purestock is offline
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Nice post rumble, its nice to hear the technical side of it instead of some bodys opinion!
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Old 11-19-2008, 05:51 PM
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Ray Bell Ray Bell is offline
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The provision of the 308 bearings instead of the 307 was made because of the fact that the much-used (presumably) overdrive would tend to make the bearings work a bit harder. So some of that strength is regained in that move.

The inherent weakness in the overdrive transmission is the step down in mainshaft size for the overdrive gear. I don't know how much difference this makes, but I'm told it's not unknown for mainshafts to be bent in the non-overdrive trannies with brutal use behind big blocks.

The cast iron case should have the original (and stronger) type of countershaft pin/fixing arrangement. This is the one area where the aluminum case is said to fall down. And, being an iron case, it shouldn't have the finer gears that were fitted for slant 6 applications. These have the 26-spline output shaft.
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Old 11-25-2008, 02:28 AM
enigma57 enigma57 is offline
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Many thanks for pointing me in the right direction, guys! Really appreciate your assistance. This is the best MOPAR site and you guys are the most knowledgeable (and the most willing to share your collective knowledge) that I've found anywhere.

I will definitely contact Jamie Passon for additional info. I have located his web page and contact info. His 'Hemi OD' gearset looks like it can handle anything that my 426 wedge engine can throw at it, so that may be the way to go. Not cheap...... But less expensive in the long run than scattering a too-weak gear case and then having to upgrade anyway.

I will keep the stock A-833 OD transmission I now have and use it in my small block daily driver as you suggested.

Thanks again,

Harry
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Old 11-25-2008, 09:08 PM
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rumblefish360 rumblefish360 is offline
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Quote:
Originally Posted by 43 purestock View Post
Nice post rumble, its nice to hear the technical side of it instead of some bodys opinion!
Thank you and thanks to Ray Bell for further clearing up my post to a much more crystal wording and description.
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