TRans and engine question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dean23 · 08-02-2002, 10:44 PM

heres a question for all you experts....If I was to put a 396 with a big cam in it that requires it to run a high stall converter such as a 3000 orbetter, how do you run an overdrive automatic with it when the stall speed is higher than the cruising rpm of my truck.

Longhorn Man · 08-02-2002, 11:59 PM

I have wondered this my self.
i am guessing (and that's all this is, is a guess) that when the lock up kicks in, it bypasses the high stall. So basicly, it will be slipping a little all the way up to lock up.
But you'll spend a butt load of $$ to get an O/D tranny to hold up to a cammed out big block and a 3K verter.

Dean23 · 08-03-2002, 06:06 PM

I'm sure someone must know the answer to this

Dean23 · 08-05-2002, 10:13 PM

Help- anyone know the answer to this. Some one must be running lots of cam and a 700r4

breeh · 08-06-2002, 12:12 AM

I am running a 700r4 behind a 427 with a pretty big cam (Performer RPM). This cam starts getting with it at about 3000 RPM. The car stalls at about 2700 RPM. There are circumstances where the stall and the OD clash but is usually at low speeds. As longhorn stated, it really is not an issue once the converter locks up.

Dean23 · 08-06-2002, 10:31 PM

So what you are saying is to throw a manual lockup switch on your dash to lock up the converter....??????

breeh · 08-07-2002, 03:02 PM

The trans is wired to automatically lock in 4th. There is a manual switch if you want to lock the converter in any other gear.

08-02-2002, 10:44 PM	#1
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	TRans and engine question heres a question for all you experts....If I was to put a 396 with a big cam in it that requires it to run a high stall converter such as a 3000 orbetter, how do you run an overdrive automatic with it when the stall speed is higher than the cruising rpm of my truck. __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

08-03-2002, 06:06 PM	#3
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	I'm sure someone must know the answer to this __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

08-05-2002, 10:13 PM	#4
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	Help- anyone know the answer to this. Some one must be running lots of cam and a 700r4 __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

08-06-2002, 12:12 AM	#5
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	I am running a 700r4 behind a 427 with a pretty big cam (Performer RPM). This cam starts getting with it at about 3000 RPM. The car stalls at about 2700 RPM. There are circumstances where the stall and the OD clash but is usually at low speeds. As longhorn stated, it really is not an issue once the converter locks up. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

08-06-2002, 10:31 PM	#6
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	So what you are saying is to throw a manual lockup switch on your dash to lock up the converter....?????? __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

08-02-2002, 11:59 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I have wondered this my self. i am guessing (and that's all this is, is a guess) that when the lock up kicks in, it bypasses the high stall. So basicly, it will be slipping a little all the way up to lock up. But you'll spend a butt load of $$ to get an O/D tranny to hold up to a cammed out big block and a 3K verter.

08-07-2002, 03:02 PM	#7
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	The trans is wired to automatically lock in 4th. There is a manual switch if you want to lock the converter in any other gear. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"



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