manual trans problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

slanty12 · 10-26-2008, 01:46 AM

ok i just got this truck not to long ago its a 1991 4x4 gmc with a tbi 350 n 5 speed trans and when i got it i was told it had a recent clutch in it and the motor has around 7000 mile on it. anyway my problem is that recently it has been im possible to get in to gear when i start it but if i started in gear once i started moving it would start to shift fine but if i let it sit for more than an hour or so it would start all over again and today i changed the fluid in the trans and in the clutch line and after that i went to watch the local mud boggs and it sat for about five hours and when i got in it to go home and i couldnt even get it to go into gear when i tried starting it it moved the truck. and i couldn't even pump up any pressure. what me n my dad are thinking is that it may be the clutch line? i see no leaks by the slave or master cylinder or even inside the truck. what im thinking is that i it might be letting air into the line while it sits?

what do yal think?

**Palf70Step** · 10-26-2008, 08:01 AM

This may sound dumb, but did you bleed the clutch cylinders? It sounds from what you saying that the clutch is not engaging. I know on the S10 the slave cylinder is inside the bell housing, but I can't remember about where the slave was on my 92 C1500.

The S10 I had acted like yours, but I was lazy for a long time and babied it so I wouldn't have to pull the housing to change it. I sold it to someone else and helped him change it.

bikerbomber · 10-26-2008, 08:26 AM

Yeah there is a way to bleed the slave and master. And the slave is on the passenger side of the tranny, you can access it pretty easily. When I got my 88 with a 'new' cough cough tranny I had to bleed and replace all the fluid. I agree, I would bleed them. Check your reservoir also and monitor for any fluid loss after the change. Also consider the slave may be 'going', and as I hear, they are usually the first of the two to die.....(cry) good luck.

-Bikerbomber

slanty12 · 10-26-2008, 12:07 PM

yes i did bleed the system ant it helped for the trip out n by the time i went to go home it was bad again

**Palf70Step** · 10-26-2008, 01:07 PM

It is sounding more to me like the slave or master (or both) cylinder are bad on the clutch.

slanty12 · 10-26-2008, 01:10 PM

thats what i thought at first to. but if that were the case wouldnt i be loosing fluid?

**truckdude239** · 10-26-2008, 02:12 PM

no i jsut went though this at work if the mc has an internal leak you wont lose fluid but you might not be able to be pressure in ym case it was a ford escape sometimes it worked sometimes it didn;t it was fixed by replaced the clucth mc

slanty12 · 10-26-2008, 03:15 PM

hmmm i never knew that i guess if a new line doesn't fix it ill try that next but i just seen where it looks like some one had cut the line and put a joint in it so i wanted it replaced anyways but i guess if it donet fix it i'll be lookin up the cost on a new master

slanty12 · 10-31-2008, 11:59 PM

well i figured it out it was the hose like i suspected although the slave cylender wasnt far behind two days after i replaced the hose it went on me thanks for all the help

10-26-2008, 01:46 AM	#1
slanty12 Registered User Join Date: Mar 2008 Location: westmelbourne fl Posts: 23	manual trans problem ok i just got this truck not to long ago its a 1991 4x4 gmc with a tbi 350 n 5 speed trans and when i got it i was told it had a recent clutch in it and the motor has around 7000 mile on it. anyway my problem is that recently it has been im possible to get in to gear when i start it but if i started in gear once i started moving it would start to shift fine but if i let it sit for more than an hour or so it would start all over again and today i changed the fluid in the trans and in the clutch line and after that i went to watch the local mud boggs and it sat for about five hours and when i got in it to go home and i couldnt even get it to go into gear when i tried starting it it moved the truck. and i couldn't even pump up any pressure. what me n my dad are thinking is that it may be the clutch line? i see no leaks by the slave or master cylinder or even inside the truck. what im thinking is that i it might be letting air into the line while it sits? what do yal think? __________________ 91 gmc k1500 chevy grill power buckets 350 5 speed

10-26-2008, 08:01 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 48,486	Re: manual trans problem This may sound dumb, but did you bleed the clutch cylinders? It sounds from what you saying that the clutch is not engaging. I know on the S10 the slave cylinder is inside the bell housing, but I can't remember about where the slave was on my 92 C1500. The S10 I had acted like yours, but I was lazy for a long time and babied it so I wouldn't have to pull the housing to change it. I sold it to someone else and helped him change it. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

10-26-2008, 08:26 AM	#3
bikerbomber Registered User Join Date: Feb 2007 Location: Sierra Vista, AZ Posts: 306	Re: manual trans problem Yeah there is a way to bleed the slave and master. And the slave is on the passenger side of the tranny, you can access it pretty easily. When I got my 88 with a 'new' cough cough tranny I had to bleed and replace all the fluid. I agree, I would bleed them. Check your reservoir also and monitor for any fluid loss after the change. Also consider the slave may be 'going', and as I hear, they are usually the first of the two to die.....(cry) good luck. -Bikerbomber __________________ If all men are created Equal* does that mean we are all artifical?

10-26-2008, 12:07 PM	#4
slanty12 Registered User Join Date: Mar 2008 Location: westmelbourne fl Posts: 23	Re: manual trans problem yes i did bleed the system ant it helped for the trip out n by the time i went to go home it was bad again __________________ 91 gmc k1500 chevy grill power buckets 350 5 speed

10-26-2008, 01:07 PM	#5
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 48,486	Re: manual trans problem It is sounding more to me like the slave or master (or both) cylinder are bad on the clutch. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

10-26-2008, 01:10 PM	#6
slanty12 Registered User Join Date: Mar 2008 Location: westmelbourne fl Posts: 23	Re: manual trans problem thats what i thought at first to. but if that were the case wouldnt i be loosing fluid? __________________ 91 gmc k1500 chevy grill power buckets 350 5 speed

10-26-2008, 02:12 PM	#7
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,259	Re: manual trans problem no i jsut went though this at work if the mc has an internal leak you wont lose fluid but you might not be able to be pressure in ym case it was a ford escape sometimes it worked sometimes it didn;t it was fixed by replaced the clucth mc __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2015 toyota Tacoma Daily 2012 Subura outback 2000 Tahoe 5.3l 420k 1999 honda accord General manager for Marco's Carwash & lube

10-26-2008, 03:15 PM	#8
slanty12 Registered User Join Date: Mar 2008 Location: westmelbourne fl Posts: 23	Re: manual trans problem hmmm i never knew that i guess if a new line doesn't fix it ill try that next but i just seen where it looks like some one had cut the line and put a joint in it so i wanted it replaced anyways but i guess if it donet fix it i'll be lookin up the cost on a new master __________________ 91 gmc k1500 chevy grill power buckets 350 5 speed

10-31-2008, 11:59 PM	#9
slanty12 Registered User Join Date: Mar 2008 Location: westmelbourne fl Posts: 23	Re: manual trans problem well i figured it out it was the hose like i suspected although the slave cylender wasnt far behind two days after i replaced the hose it went on me thanks for all the help __________________ 91 gmc k1500 chevy grill power buckets 350 5 speed



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