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Old 05-14-2018, 02:29 PM   #1
Dan Fahey
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Default 4L60E Trans and Converters

Can you install a non locking racing converter in place of a locking converter without issue?

D
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Old 05-14-2018, 04:20 PM   #2
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Default Re: 4L60E Trans and Converters

There were 4 different turbine shafts available for the 700-R4 and 4L60e . The 4L60e came with 2 of them , a 298mm style , 30 spline , with a short stub journal with a seal on it , on the engine end of the shaft , and a second style meant for the 300 mm converter , 30 spline , but with a larger o-ring seal after the spline closer to the pump . As long as you inform the converter manufacturer which style shaft you have , there should be no problem using a converter without a converter clutch in it .
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Old 05-14-2018, 05:00 PM   #3
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Default Re: 4L60E Trans and Converters

Been a few years since I delt with this, while my race car was still a street car. Seems like it required an input shaft without the passage through it, or the hole in the shaft plugged. Wish I could remember which. The people at TCI or ATI could tell you.

That 3.06 low gear is not likely a big issue for your car. Mine was like a tractor. Standing straight up, or spinning the tires. Front end stayed up through second gear in good air, if it hooked well. Likely not so much of an issue in a 4000 lb car with less hp. Big RPM drop at the shifts won't help anything. T350 trans was faster.
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Old 05-15-2018, 07:56 AM   #4
Jim Kaekel
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Default Re: 4L60E Trans and Converters

Concerning the 3.06 first gear, Sonnax offers a replacement 2.84 gear set.
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Old 05-15-2018, 11:49 AM   #5
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Default Re: 4L60E Trans and Converters

Quote:
Originally Posted by Jim Kaekel View Post
Concerning the 3.06 first gear, Sonnax offers a replacement 2.84 gear set.
That would be some help.
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Old 05-15-2018, 12:36 PM   #6
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Default Re: 4L60E Trans and Converters

Quote:
Originally Posted by Jim Kaekel View Post
Concerning the 3.06 first gear, Sonnax offers a replacement 2.84 gear set.
My car seems to love the 3.08
For K/SA minimum weight is 4057.
Going to be little more than 4100lbs.
Can definitely see benefit of a 2.84 gears for the Camaro/Firebird

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Old 05-15-2018, 12:51 PM   #7
Jim Kaekel
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Default Re: 4L60E Trans and Converters

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Originally Posted by Dan Fahey View Post
My car seems to love the 3.08
For K/SA minimum weight is 4057.
Going to be little more than 4100lbs.
Can definitely see benefit of a 2.84 gears for the Camaro/Firebird

D
I would certainly consider trying it. Although your car is hefty, a lower numerically gear set would provide closer ratios and less RPM drop on the gear changes, and may pick you up some E.T. The 3.06 may provide a quicker 60', for example, but that certainly doesn't guarantee that you will have a quicker E.T. slip. Just my .02.
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Old 05-15-2018, 01:48 PM   #8
Dan Fahey
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Default Re: 4L60E Trans and Converters

Quote:
Originally Posted by Jim Kaekel View Post
I would certainly consider trying it. Although your car is hefty, a lower numerically gear set would provide closer ratios and less RPM drop on the gear changes, and may pick you up some E.T. The 3.06 may provide a quicker 60', for example, but that certainly doesn't guarantee that you will have a quicker E.T. slip. Just my .02.
That can be an option down the road.
Does great in 1/8 mile and does not bog in between.
Already in third before the 1/8th mile..

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Old 05-15-2018, 02:50 PM   #9
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Default Re: 4L60E Trans and Converters

You need to modify the convertor clutch circuit to feed the torque convertor properly by using a kit like this https://www.summitracing.com/parts/trg-4l6-ccv.
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Old 05-15-2018, 04:44 PM   #10
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Default Re: 4L60E Trans and Converters

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You need to modify the convertor clutch circuit to feed the torque convertor properly by using a kit like this https://www.summitracing.com/parts/trg-4l6-ccv.
My Trans was built by PerformaBuilt Trans

http://www.performabuilt.com/gm%20pe...d%20truck.html

Just called and talked to Frank at PerformaBuilt...
I can install a Non-Locking converter in place of the Locking Converter with no issues.
Should have spoken to him first.

Now have to decide the correct size and stall.

What is a good stall speed to start with 5000rpm?
John Partridge suggested 5500/5600 with full up Stocker cam.


Dan

Last edited by Dan Fahey; 05-15-2018 at 05:04 PM.
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