Ok, I know this has probably been covered a billion times, but I got to thinking while at the Nats looking at the Keisler TKO600 how much power/torque the 4 speed would take. Any vendors selling an upgraded 4 speed?

I hear the TKO's start to get very marginal once you get to the kind of torq numbers a strong stroker puts down. I think 600ft-lbs would be pushing the borderline for the TKO. Passon or Brewers can probably sell you the meanest 18 spline 4sp you'd need. Passon now has an o/d gear set available. I'm not exactly wowed by his .80 o/d ratio as opposed to the TKO-600's .64, but if you're going to be racing and putting any traction down with that stroker, I would be leaning to the 833(though not the 70s-80s factory o/d 833).

TKO has bigger,stronger gears and shafts than A833.

If you need overdrive then the TKO600 would be your best choice but if it isn't important then just go with an 18 spline A-833 which is much stronger, good luck.

Thanks for the explanation. I am not pitting the two tranny types against each other. But after speaking with you guys, a couple good info came to light I hadn't thought of before. Just curious how much power the 833 can take. I'm pretty much on the fence right now. I think in the end money, and ease of installation will be factors other than the best bang for the buck.

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TKO has bigger,stronger gears and shafts than A833

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A833's were good enough for stockers, super stockers and gas cars for years ! There will be a lot weaker links in the drivetrain than the 833 !

Not to repeat myself but if overdrive is not important to you and ease of installation and factory fit are, then just stick (no pun intended)with an A-833. As stated above you will break other parts before the trans and properly set up they shift much better, good luck.

I talked to Passon at Carlisle, and if I'm not mistaken, this is how I understand it. They will take my 4-speed trans and replace the internals with an overdrive using components that will upgrade them to the Hemi version but the output shaft will have the same number of teeth but will also be upgraded.

Well while at the Nats, I spoke with Brewer's, Passon, and Keisler. All were very nice and informative. I will say I was surprised at how thorough the Brewer's kit appeared to be on paper. The parts I saw looked impressive too. Keisler also asked plenty of questions with my combo. They said the TKO 500 would probably suffice, but you know how that would go if I ever upgraded in the future. Just wanted to know what I was up for. With a Keisler, do you need to do any welding like in the factory 833 kits?

We can actually take your unit and change the gearset in it to make 4th gear .80:1 instead of 1:1. Therefore, since your trans already fits into the car, there is no modifying, changing bellhousings, shifters, crossmembers, driveshafts, etc. None of that stuff. You do end up with the 18 spline input shaft. If you started with an 18 spline, you keep the same clutch. If you started with a 23 spline, you need to get an 18 spline clutch which we have. However, this is an off the shelf clutch. It is not a special conversion deal that you don't know what you need when you need a clutch and thus causing you to be limited where you can get a clutch down the road. Anyway, as far as power capabilities. Can you break our unit, yes. Has anyone yet? Thankfully no. To date, we have a customer putting 893 lb/ft of torque through it in a 4000 lb car. So, unless he is lying to me, it is holding that thusfar.