Torque converter for 406
Thread Starter
Racer
Joined: Oct 2006
Posts: 269
Likes: 7
Torque converter for 406
I am looking for help choosing the appropriate stall for a 406 in a 77 vette with a stock thd350 and 3:08 gears. Most vendors I talk to recommend a 2000 - 2400 stall. This seems small for a 406 but with 3:08 gears it will be turning 2500 rpms @ 65 mph.
If I go with a higher stall for a better launch will I cause slippage and overheating when driving around town? This will be a strictly street driven vehicle. The desktop dyno shows Max TQ of 506 @ 3750 RPM and Max HP of 475 @ 5500 RPM. The desktop dyno does not show TQ below 2750 RPM's. At 2750 the TQ is 485.
If I go with a higher stall for a better launch will I cause slippage and overheating when driving around town? This will be a strictly street driven vehicle. The desktop dyno shows Max TQ of 506 @ 3750 RPM and Max HP of 475 @ 5500 RPM. The desktop dyno does not show TQ below 2750 RPM's. At 2750 the TQ is 485.
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
With ANY higher than stock stall converter you should install a transmission cooler. If your car is strictly street, you will be happy with a 2000-2400 stall. These are usually 11" converters, and are very efficient even with stock gearing. You will not not notice slippage different from stock when driving. Higher stalls (around 3000 or more), however, are noticeable around town (slippage) and are best suited for steeper gears. The performance gain is noticeable, but best suitable for occasional drag strip runs.
Le Mans Master
Joined: Jan 2006
Posts: 9,192
Likes: 27
From: Boca Raton Florida
No minimum operating temp on an auto, the lower the netter. Either use a powered cooler or a heat sink type. Keep it as cook as possible.
The higher stall will not cause more slippage, it will slip more bt design, but not cause you to over heat around town
The higher stall will not cause more slippage, it will slip more bt design, but not cause you to over heat around town
Thread Starter
Racer
Joined: Oct 2006
Posts: 269
Likes: 7
I just want a stall that is noticably better than stock and will allow the wheels to spin. Since the 406 is being built to be tourqey anyway is a 2000 sufficient for a good launch? I only have access to torque convert when I make the swap to the 406. I want to make a wise choice.
Thread Starter
Racer
Joined: Oct 2006
Posts: 269
Likes: 7
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
Yes, I used this converter before my present Art Carr. This is an excellent street converter. Stalled at around 2400 rpm in my 383, and is very efficient. NO noticeable change (slippage) from stock when cruising. As for 2000 rpm cruising with a 2400 stall converter.....your car doesn't sit still until "stall speed", but moves at at low rpms as you accelerate; to this extent, ALL converters slip regardless of stall. Unless you have a lock-up converter, it is ALWAYS slipping to some degree, even at top end. More efficient converters just slip less. Your 2000 rpm cruising may not be noticeably different with the new 2400 stall than with the stock converter. At 2000 rpm, the TCI was about moving my car about 1 mph slower than the stock converter did.
Safety Car
Joined: Oct 2000
Posts: 3,593
Likes: 103
From: Southern Indiana
www.PTCRACE.com
They have the best stalls that move just fine on the street, and when you stomp the gas its like popping a clutch!
Im going with a 10 inch 3500 for the street, Ive had 3 of them and they work great!
They have the best stalls that move just fine on the street, and when you stomp the gas its like popping a clutch!
Im going with a 10 inch 3500 for the street, Ive had 3 of them and they work great!
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Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Most of the tc are rated for a 350, more torq means higher stall. In my Formula I have a 355, 3.73 rear with a 700r4 running a 2800 stall and it bits at about 3000 because of the higher torq from 700r4 first gear and 3.73 gear. Your 400 will stall higher than a 350 for sure.
Racer
Joined: Sep 2005
Posts: 453
Likes: 1
From: Austin TX
I'm running a 700r4, 3.08 rear, and a 2000 stall on my 406. It slips a bit more than stock and it is noticeable especially if you hit it hard. I'm happy with the way it performs and I intend to drive it around town which is why I went with a lower stall. I wouldn't recommend a large slip unless you're racing.
Thread Starter
Racer
Joined: Oct 2006
Posts: 269
Likes: 7
I'm running a 700r4, 3.08 rear, and a 2000 stall on my 406. It slips a bit more than stock and it is noticeable especially if you hit it hard. I'm happy with the way it performs and I intend to drive it around town which is why I went with a lower stall. I wouldn't recommend a large slip unless you're racing.
I am putting together the 406 to be very torquey. My goal is to be shoved back in the seat and spin the tires while still using the 3:08 gears. Is this a realistic goal with a 2000 stall
