HP rating on a THM 200? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-03-2003, 08:17 AM
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Post HP rating on a THM 200?

I have a 1977 Monza with a 305ci engine and a THM 200 tranny. I was planning to do a few upgrades (4bbl carb, alum manifold, headers, etc) to it and I was wondering if any of you guys know just how well this tranny will hold up. Does anyone know just how much HP this tranny will handle before it flies apart? Thanks for the help on this.

Mike

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Old 06-03-2003, 04:59 PM
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In a light car such as your Monza.......the 200 will stand up to more power than you can get the 305 to dish out .

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Old 06-03-2003, 05:22 PM
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Fantastic! Thanks Deuce, that is just what I was hoping to hear. Eventually I will be putting a 350ci in it but not till winter and then I can move to a TH350. I just wanted to have a little fun with it this summer without spending a lot to get it running a little better than it does. By the way, I am putting a posi in it. That won't cause any trouble will it? Thanks again.

Mike
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Old 06-04-2003, 04:40 AM
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Has anyone ever used oone of these kits from Summit for the swap of a TH200 to a TH350?
http://store.summitracing.com/produc...57#largerimage

Mike
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Old 06-04-2003, 06:46 PM
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I believe that bracket is what you are looking for if you change to a THM350 .As far as the 1977 THM200 the name came from the original design torque capacity of the transmission 200 pounds feet of torque. The 350 was for 350 lbs/ft the 125 was for 125 lbs/ft. The 440T4 and the 700R4 were metric.The 440T4 was 440 newton meters. The 700R4 was 700 Newton meters.
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Old 06-06-2003, 02:37 PM
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That bracket is for Camaros & Firebirds with 200-4R overdrives. You don't need it for a Monza.
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Old 06-06-2003, 04:08 PM
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As I recall, the only thing you will need to change from a TH200 to a TH350 is the correct kick-down cable, dipstick and tube, and a vacuum line for the modulator. The mount, linkage, and driveshaft should interchange.
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