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

[FLEMING]

Has anyone done a back to back comparison of a good th350 to a good metric 200? I have heard the metric is a solid tenth faster...

I am looking at purchasing a combo with trans and convertor but I may pass on the trans/convertor and just buy the engine if the metric is really worth the difference..

Also does the metric use the same crossmember as the th350?

[jim powers]

same crossmember, depending on your combination a solid .12 should be the result

[Dion Hildebrandt]

I did this change and a solid 7 hundredths was discussed, my actual improvement is undetermined because I made a few changes at the same time.

a stock 350 gear was a 2.52, and the metric low is a 2.74. I saved 60 pounds just changing the transmission. the 60 foots changed dramatically

Stock crossmember, same driveshaft, same shifter and for me same convertor (I have a 350 input shaft)

I had almost 200 problem free passes before I had the trans opened up. This is in a 3500 pound small block chevelle

[FLEMING]

I have heard you only get about 75 to 100 runs out of metric gearset?? Is that true? Also I have heard that you need to not let the tires "chirp" coming out the burnout as this will break them?

[Mike Taylor 3601]

Randall's truck picked up.30 or .35 it had the 4.3 then you would have to ask him about the 350 he took out had done,but I do know the 200 has manual valve body and that is about it.

I say that probaly isn't normal gain
Don't want to jinx him but I know several times Randall has put over 200 passes,only time he has broke is when he broke ring and pinion,bust sprag/planetary Mike Taylor 3601

[Dion Hildebrandt]

I may be doing the burnout wrong , but I have had no issues doing it this way
-roll into the box with shifter in 2nd (auto 1-2)
-bring rpms up to 5-5500
-once rpms have been reached let go of the line lock and roll out until tires grab
I run radials and haven't had any traction problems either.

recently I had a modulator come apart but that has been the only issue with this trans.

- I should note that when we had the trans apart, we could have reused all of the frictions and steels. Gears all looked fine, or new like

[FSA1673]

It was worth 0.15 to 0.18 in my car. My Metric 200 trans was 35 pounds lighter than my old Turbo 350. I purchased my Metric 200 through the Sepanek's. They build a good reliable trans and are fantastic people to deal with.

Thanks, Scott

[Alan Roehrich]

It would be interesting to know what was in the TH350 transmissions used for comparison. There is a considerable difference between an "average" TH 350, and a lightweight SLD type transmission from a company such as ATI, or as I build with ATI components.

[Greg Hill]

On my car it was .04 to .06 better, but I had a really trick 350 that had a rotating assembly as light as a stock 200. I think the higher the hp and torque the less difference.

[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.