Eng. Stalls When I Drop into drive . - The 1947 - Present Chevrolet & GMC Truck Message Board Network

My Boy's Toy · 09-14-2003, 07:51 PM

I Idle at about 800 Rpm With a 272 Dur. Crain cam in a 275 Hp 327 , 700R4 . the problem is when I put it in gear , it lurches forword & the Rpms drop to stall range ? Any Ideas & ways to solve the problem?

rustyold69 · 09-14-2003, 10:13 PM

im not sure but you might need a stall convertor

jef5150 · 09-14-2003, 10:22 PM

i was gonna say that also,,,,,,,did you just mate this motor and tranny? i remember some seeing something about cam size,and matching torque convertor to it,,,,,,,,,jeff

cduster · 09-15-2003, 12:09 AM

7 grand wholeshot???

Is the exhaust plugged? I had a friend

plug the exhaust on an 89 dodge I used to have, and it would idle fine, (about as fine as a Dodge can, anyway) but as soon as I put it in gear it died.

My Boy's Toy · 09-15-2003, 07:05 AM

I'm running the stock Converter on it . I was thinking that might be the problem. but not sure?

hgs_notes · 09-15-2003, 09:42 AM

When I went from a manual tranny to the automatic, I ended up replacing the cam. I had a Crane Blazer cam in it, I think it had about 272 duration and had a good loping idle that I loved. But, after I put the TH350 in, I had to set the idle up to almost 1600 so it wouldn't kill at every stop. I could have replaced the torque converter, but I recammed it to a milder profile and put in rhodes lifters. It runs great and I still have pretty good mid range and top end power, but dam I miss that loping idle.

HG

My Boy's Toy · 09-15-2003, 12:21 PM

that sounds about the same as mine , I like the cam to . Nice sound . That might be the best way to go . jest cant drive it like this!

vfrdude · 09-15-2003, 01:12 PM

Try setting the idle higher (approx 1000 - 1200 rpm), then drop it into gear. At this point lower RPM down, if you need to to get a decent idle when it's in gear. Make sure you block the wheels, and parking brake is on when you do this. You'll have to open and close the throttle a couple of times to get it to settle in.

With the higher duration camshaft, you probably wont be able to maintain the stock idle settings....

Rudy

cableguy0 · 09-15-2003, 03:42 PM

with that big of a cam you have to run a stall verter or the thing will never run right. because if you do idle it up higher you gonna have trouble just sitting at a light because the truck is gonna want to keep jumping forward. go get yourself a tci 2500 stall convertor they run about 250 bucks and you problem will be gone

tom hand · 09-15-2003, 04:44 PM

As a general rule anything above 270 duration has to have a stall converter. You need to check out what gear you have because if you run a stall coverter with "highway" gears the converter will never get out of it's stall range and burn up in no time...but will do some impessive burnouts at any speed. [Don't ask me how I know that...lol]

My Boy's Toy · 09-15-2003, 05:06 PM

Tom . I'm Running a 373 Posi , Would a 2500 Stall speed be about right . & your rite about the burnouts .Jest got to love it. Thanks Paul

tom hand · 09-15-2003, 05:15 PM

I would call all the major converter manufacturers and tell them your motor specs,trans,gears etc and let them tell you what would be best for you application.

jef5150 · 09-15-2003, 07:51 PM

http://www.smokemup.com/tech/700r4.php
check out this site it might help,its all about the 700r4............jeff

dwaite72lnghrn · 09-15-2003, 10:35 PM

Check the vacuum at idle if it is low and steady look for timng/vacuum leaks if it is real bouncy its the cam and you can take the idle up to about 850 in drive more than that you start to burn things in the trany at idle. You could have an open port or cracked vacuum line and cause the same condition. just a thought.

09-14-2003, 07:51 PM	#1
My Boy's Toy Registered User Join Date: Dec 2001 Location: West Unity, OH, USA Posts: 235	Eng. Stalls When I Drop into drive . I Idle at about 800 Rpm With a 272 Dur. Crain cam in a 275 Hp 327 , 700R4 . the problem is when I put it in gear , it lurches forword & the Rpms drop to stall range ? Any Ideas & ways to solve the problem?

09-14-2003, 10:13 PM	#2
rustyold69 student wrench turner Join Date: Jan 2003 Location: wrightstown, wisconsin Posts: 192	im not sure but you might need a stall convertor __________________ 1969 Chevy C-10 with 250 L6 2002 GMC Sierra 2500 HD Duramax with banks six gun

09-15-2003, 09:42 AM	#6
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	When I went from a manual tranny to the automatic, I ended up replacing the cam. I had a Crane Blazer cam in it, I think it had about 272 duration and had a good loping idle that I loved. But, after I put the TH350 in, I had to set the idle up to almost 1600 so it wouldn't kill at every stop. I could have replaced the torque converter, but I recammed it to a milder profile and put in rhodes lifters. It runs great and I still have pretty good mid range and top end power, but dam I miss that loping idle. HG __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

09-15-2003, 01:12 PM	#8
vfrdude Registered User Join Date: May 2002 Location: Oakley, Ca. USA Posts: 137	Try setting the idle higher (approx 1000 - 1200 rpm), then drop it into gear. At this point lower RPM down, if you need to to get a decent idle when it's in gear. Make sure you block the wheels, and parking brake is on when you do this. You'll have to open and close the throttle a couple of times to get it to settle in. With the higher duration camshaft, you probably wont be able to maintain the stock idle settings.... Rudy __________________ Rudy Fierros '95 Honda VFR750F Used to have a '71 Chevy Stepside, Guards Red, Lowered 4" rear, 3" front, White Oak bed wood, 700R4 w/373 gears until some low life stole it!

09-15-2003, 03:42 PM	#9
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	with that big of a cam you have to run a stall verter or the thing will never run right. because if you do idle it up higher you gonna have trouble just sitting at a light because the truck is gonna want to keep jumping forward. go get yourself a tci 2500 stall convertor they run about 250 bucks and you problem will be gone __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

09-14-2003, 10:22 PM	#3
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	i was gonna say that also,,,,,,,did you just mate this motor and tranny? i remember some seeing something about cam size,and matching torque convertor to it,,,,,,,,,jeff

09-15-2003, 12:09 AM	#4
cduster Registered User Join Date: Oct 2002 Location: S.W. Michigan Posts: 403	7 grand wholeshot??? Is the exhaust plugged? I had a friend plug the exhaust on an 89 dodge I used to have, and it would idle fine, (about as fine as a Dodge can, anyway) but as soon as I put it in gear it died.

09-15-2003, 07:05 AM	#5
My Boy's Toy Registered User Join Date: Dec 2001 Location: West Unity, OH, USA Posts: 235	I'm running the stock Converter on it . I was thinking that might be the problem. but not sure?

09-15-2003, 12:21 PM	#7
My Boy's Toy Registered User Join Date: Dec 2001 Location: West Unity, OH, USA Posts: 235	that sounds about the same as mine , I like the cam to . Nice sound . That might be the best way to go . jest cant drive it like this!

09-15-2003, 04:44 PM	#10
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	As a general rule anything above 270 duration has to have a stall converter. You need to check out what gear you have because if you run a stall coverter with "highway" gears the converter will never get out of it's stall range and burn up in no time...but will do some impessive burnouts at any speed. [Don't ask me how I know that...lol] __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

09-15-2003, 05:06 PM	#11
My Boy's Toy Registered User Join Date: Dec 2001 Location: West Unity, OH, USA Posts: 235	Tom . I'm Running a 373 Posi , Would a 2500 Stall speed be about right . & your rite about the burnouts .Jest got to love it. Thanks Paul

09-15-2003, 05:15 PM	#12
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	I would call all the major converter manufacturers and tell them your motor specs,trans,gears etc and let them tell you what would be best for you application. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

09-15-2003, 07:51 PM	#13
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	http://www.smokemup.com/tech/700r4.php check out this site it might help,its all about the 700r4............jeff

09-15-2003, 10:35 PM	#14
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Check the vacuum at idle if it is low and steady look for timng/vacuum leaks if it is real bouncy its the cam and you can take the idle up to about 850 in drive more than that you start to burn things in the trany at idle. You could have an open port or cracked vacuum line and cause the same condition. just a thought. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne



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