Re: Transmission Converter Options
 

I still think that this might work , with a 3.06 low gear and only running to 3rd . Big drop on the 1-2 shift which would need a looser converter to recover from , but the loose converter hurts upstairs with a heavy car , so lock up in high gear and get your mph back . Its worth a try , just need a converter company willing to help .

Re: Transmission Converter Options
 

Just on the drag factor a 200 should be a day and a half faster than a 4LE60 or us idiots have been doing it all wrong.

Re: Transmission Converter Options
 

Mark;
YANK designed a strong converter and its costs a bit more.
Their Locking Converter uses a wider Clutch band.

Our Impala Club has Twin Turbo Cars that use the Locking Converter.
They have a lot more power than my car.

The Yank LC is a little heavier than other LC.
Yet works out well launching my 4100+ Lb car.
I understand how a lighter converter can work in a much lighter Car.

Towing you can Manually Lock the Converter for better mileage on flatter grades.

Vigilante and Edge are good too for racing but do not have the wider Clutch feature as the Yank.

Have 4.56 gears now not using the lock feature.
Same RPM range can use 5.38's or 5.13's with a 30 inch tall tire Locked.
Cruises great with the OD and converter locked.

As for getting under the K/SA 12.65 index.
Car is going to make a good bit more power and building reliability first.
Planning installing full up properly beefed 10 bolt Rear.
Still needs a Roll Bar and smaller gas tank.

Doing things in stages and still having fun a Pure Stocker.

One of the things learned from our Impala Club.
Build up the weak points before adding power.

Dan

Re: Transmission Converter Options
 

I have seen hybrid converters with a 8" core , but a larger 298 mm clutch and front cover . That style converter has way too much inertia to work well in Stock . What might work pretty well is a 245 mm converter which is a lot lighter and only slightly bigger than a 8" Opel converter.

Personally I think you will need more rearend gear , but you can creep up on that , once you get going .

Good Luck

Re: Transmission Converter Options
 

The 4L60E and R700 have a 3.08 First gear.
Great for launching.

BTW what RPM do you cross the traps at?

D

Re: Transmission Converter Options
 

Totally agree with you . I had probably the first stocker to run a 200thm in my 83 307 Cutlass . Definitely faster than a 350 or a 400 .

I think Dan wants to work with a 4L60e , and that's cool too ! There are a lot of large diameter steel drums inside that beast , and I am not sure if any aftermarket company making aluminum replacements .

Re: Transmission Converter Options
 

4L60E is what I have and know and it is built up.
For now going with what I have.

A built 200thm costs a good bit.
The R700 and 4L60E are stronger, right now prefer reliability.
They have similar internals.
Should already have some light weight race components.

This is a good conversation.

D

Re: Transmission Converter Options
 

Feeling pretty good about my current Coan Lite TH350 w/low gearset vs the metric 200 so far.

Re: Transmission Converter Options
 

I know someone with a 200 for sale with only 4 or 5 runs on it.

Re: Transmission Converter Options
 

Coan makes good transmissions!
Liked them when they started business in the early 80s.

The Metric 200 is fine for a lighter car.
4000lb plus weight you need a wider clutch and HD internals.

D