Metric 200 - What do I need to make one last
 

Good Afternoon guys. It's time to start converting our 93 Z28 IHRA pure stock car over to be NHRA legal. Car is 90% ready it just needs a drivetrain. I already have a motor, next up is a tranny. Of course I had a good TH350 that I sold recently.....DOH! I also have a Metric 200 but it's bone stock. I have a few options for tranny builders but I wanted to pick your brains a lil. Other than the obvious, manual valve body, deep pan, etc. What do I need to make this thing live? It will get beat on as we bracket race... A LOT! LOL! Does it have the same input and or output shafts as the TH350? I have a good ATI converter for my old TH350 I'm hoping to reuse?? Also do I need a different yolk?? Mounting points?? Thanks in advance!

Re: Metric 200 - What do I need to make one last
 

I highly recommend Turbo Action. I have had a few different brands that didn't do so well.

You will need another converter. The mounts, driveshaft, and shifter will work. The tail housing has metric threads for the mount, so you will need new bolts.

Re: Metric 200 - What do I need to make one last
 

If you get the rebuild through Scott McClay , he has an option to get you a 350/400 turbine shaft , and revised pump . That way you can use your current converter .

Re: Metric 200 - What do I need to make one last
 

Get a J.W. Performance Ultra Bell. I cracked two cases before getting one. The case is the weak link on a TH200

https://racewithjw.com/product/ultra...-metric-to-gm/

Re: Metric 200 - What do I need to make one last
 

If you don't go with the 350/400 changeover option, you still want to get a hardened stator support shaft insert.

Re: Metric 200 - What do I need to make one last
 

Real simple Sepanek Racing Transmissions. I have 75 runs on his metric in a Big Block Chevy stocker. It's a 1970 402/375 hp making 635 hp. It's the fastest trany I've had in my car and it has lasted. BP

Re: Metric 200 - What do I need to make one last
 

Sepanek all the way,best and fastest out there

Re: Metric 200 - What do I need to make one last
 

Thanks guys and keep em coming! I've been told the Metric 200 is about a tenth faster than a TH350. Hoping this is true??? I would hate to leave that on the table but I'm wrestling with the durability of the 350.

Re: Metric 200 - What do I need to make one last
 

A good one will be fine behind an LT1. It will also be a little faster.

Re: Metric 200 - What do I need to make one last
 

Billy Lynn does also a great Metric 200. If you've got a TH350/400 convertor, you can have a input for those installed along with the appropriate pump mods. The governor driven auto 1-2 makes them very consistent. The JW bell housings are a worthwhile addition or you can fabricate a brace for the stock case. Also, the Lokar flexible dipstick makes life a lot easier. The marks on the Lokar unit aren't correct so you need to remark it relative to the oil pan flange on the case. Retapping the oil pan holes to 1/4X20 from the metric size is another thing to do to simplify things. If you elect to have a roller rear bearing installed in place of the bronze one, the drive shaft yoke will likely need to be turned down about .020 for proper fit.

For what it's worth. -Al

Billy Lynn (501) 278-0651

Re: Metric 200 - What do I need to make one last
 

I recently had the rear end of my car apart to change the ring and pinion, and when I was re-installing the driveshaft, I noticed that the output shaft of the McClay THM200 in the car seemed to be free to move around an awful lot. I immediately checked my spare McClay THM200, and the output shaft was exactly the same. With the driveshaft installed, the movement was all but gone. Never noticed that degree of movement with Powerglides or THM350s. Does the driveshaft slip yoke stabilize the output shaft that much, in a THM200?

Re: Metric 200 - What do I need to make one last
 

Yes, my first experience with the output shaft alarmed me too......

Re: Metric 200 - What do I need to make one last
 

I've had units from both Turbo Action and Jack Sepanek and both companies will build you one that will last and get you into the winners circle .

Re: Metric 200 - What do I need to make one last
 

Mike, Yes, with no removable tailhousing , there's no support bushing in the rear, besides the very end one . Cost-cutting, no doubt.

Re: Metric 200 - What do I need to make one last
 

All good options, so far ..
At least one missing... Think West...Way West ;-)

Re: Metric 200 - What do I need to make one last
 

X 2. Scott McClay. Worth every penny and very dependable.

Steve Teeter STK 620.

Re: Metric 200 - What do I need to make one last
 

X3. Scott McClay.!
I use one in my AA/SA ZL1 427
it 60'S 1.28 at 3540 lbs!
Scott is a great guy to deal with and knows how to build a 200 metric to last!

Re: Metric 200 - What do I need to make one last
 

I guess Tehachapi IS farther west than San Dimas , a little bit ;-)

I happen to know most all on these guys mentioned, so it's hard to recommend one over the other..Besides, that wasn't the o/p's question.

There's a racer in Kansas that's a pretty good builder too..

Re: Metric 200 - What do I need to make one last
 

it's not, unless its a stocker or a generic 350 you get some weight savings a nickel on a Super Stock at least a dime on a Stocker But .005 is a lot we spend a lot of time and money looking for a tenth

Re: Metric 200 - What do I need to make one last
 

Leo builds a great unit

Re: Metric 200 - What do I need to make one last
 

Remac, A-1, McClay, Turbo Action, Sepanek, etc are all solid companies. I am partial to WPE (Wudarczyk Performance Engineering). We have had them last behind 427’s, to SS cars, and I used one to bracket race with 11 years ago.