Back to back comparison of Th350 and Metric 200???

Bob Mulry · 07-29-2014, 11:01 PM

Quote:

Originally Posted by Alan Roehrich

That's what I'm getting at Greg.

Compare the Metric 200 to a 350 with aluminum forward and direct drums, lightened front and rear planetaries, a 250C sun gear shell, a gun drilled output shaft, and all roller thrust bearings.

I've seen a lot of claims about ET reduction of various transmissions. I can tell you that I built a killer 350 for a well known and successful Stock Eliminator racer a few years back. A couple of years or so later, he was told that a certain high dollar transmission would be 0.07 to 0.12 faster. He spent a lot of money, and he may have knocked 0.03 or so off of his ET. It was a big block car with fairly high HP, about 3700 pounds or so.

And don't forget the extra $500 for the 2.75 low gear set for a TH-350, which comes as a 2.74 low gear as standard on a TH-200......

Aluminum direct & forward drums, a 2.75 low gear and the lightening of the gear sets make this a more expensive trans than the TH-200.

Just my thoughts,
Bob

Alan Roehrich · 07-30-2014, 12:14 AM

That assumes you want or need the 2.75 low, which is not always the case. And if you don't want the 2.75, you have to go with a custom gear set for the 200.

If the 200 is not substantially faster, then the only advantage would be cost, and with the added durability of the 350, it becomes a wash. We've got the same stuff on the 350 that has been in it since 2007, for a lot of passes.

The 200 is not that much cheaper if you need or want the bigger input shaft and stator shaft, so you can use the turbo converter and/or need the strength.

The 200 is not a tenth faster than a really good 350 in many cars, I talked to Scott McClay about it, and I'd say he knows as much or more about it than anyone. The more power the engine has, the smaller the ET reduction, and the heavier the car, the shorter the lifespan. For example, Scott told me that in our big block Camaro, he'd expect no more than 0.03 quicker with his best 200 vs my 350, at best. Thomas Arnett and I have talked about it for a while now, he's not sure he could get more than 0.03, either, he runs a 200 in his car, similar to ours. We've been meaning to try it.

FLEMING · 07-30-2014, 08:32 AM

I guess I need to see whats in the th350 then... it is a turbo action piece I know that much.. Its a low horsepower mid 70's 350 combo (i think 185hp)... I have a 4.88 in my car do I need to go 5.13? I have NEVER ran anything other than a powerglide so this is going to be interesting going from a 1.80 low gear to a 2.5+ first gear.. lol

07-30-2014, 12:14 AM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,136 Likes: 1,614 Liked 1,923 Times in 432 Posts	Re: Back to back comparison of Th350 and Metric 200??? That assumes you want or need the 2.75 low, which is not always the case. And if you don't want the 2.75, you have to go with a custom gear set for the 200. If the 200 is not substantially faster, then the only advantage would be cost, and with the added durability of the 350, it becomes a wash. We've got the same stuff on the 350 that has been in it since 2007, for a lot of passes. The 200 is not that much cheaper if you need or want the bigger input shaft and stator shaft, so you can use the turbo converter and/or need the strength. The 200 is not a tenth faster than a really good 350 in many cars, I talked to Scott McClay about it, and I'd say he knows as much or more about it than anyone. The more power the engine has, the smaller the ET reduction, and the heavier the car, the shorter the lifespan. For example, Scott told me that in our big block Camaro, he'd expect no more than 0.03 quicker with his best 200 vs my 350, at best. Thomas Arnett and I have talked about it for a while now, he's not sure he could get more than 0.03, either, he runs a 200 in his car, similar to ours. We've been meaning to try it. __________________ Alan Roehrich 212A G/S

07-30-2014, 08:32 AM	#3
FLEMING Member Join Date: Aug 2003 Posts: 264 Likes: 51 Liked 55 Times in 26 Posts	Re: Back to back comparison of Th350 and Metric 200??? I guess I need to see whats in the th350 then... it is a turbo action piece I know that much.. Its a low horsepower mid 70's 350 combo (i think 185hp)... I have a 4.88 in my car do I need to go 5.13? I have NEVER ran anything other than a powerglide so this is going to be interesting going from a 1.80 low gear to a 2.5+ first gear.. lol