down shift - The 1947 - Present Chevrolet & GMC Truck Message Board Network

supamatic · 09-22-2009, 10:33 PM

what would cause my truck not to down shift i have 350 motor th350 tranny in a 1976 gmc pickup longbed it feels like im pressing on the brake slowly anyone know

**N2TRUX** · 09-22-2009, 11:10 PM

Will it shift up by itself? Will it downshift if you do it manually?

supamatic · 09-22-2009, 11:20 PM

yeah itll shift up yes i can do it manually what gives

supamatic · 09-23-2009, 01:10 AM

k riddle me this what happens if my drive shaft isnt all the way into my tail shaft of my transmission

KQQL IT · 09-23-2009, 01:12 AM

The easy fix would be the kickdown cable is off/out of adjustment and the driveshaft should be out an inch or so on slipyoke

79gmcc15 · 09-23-2009, 01:17 AM

I don't think the kick down is for down shifting like the problem he is having. IIRC it is to make it drop down to 2nd gear to help you pass some one or accelerator faster when WOT.

supamatic · 09-23-2009, 01:45 AM

how do u adjust the kick down if this is the problem but my shaft was out to where it was leaking fluid out of shaft it was leaking like crazy

Moostifer · 09-24-2009, 11:28 AM

Quote:

Originally Posted by supamatic

how do u adjust the kick down if this is the problem but my shaft was out to where it was leaking fluid out of shaft it was leaking like crazy

sounds like the yoke seal is bad... very easy fix. Drop the driveshaft, pull out the seal with a hook, tap in new seal with a wooden block & hammer, wipe new seal with trans. fluid, re-install driveshaft, replace tranny fluid that leaked out.

as they stated... need to know whether it's not kicking down on acceleration, or it's not down shifting when roll ing to a stop.

LiveAnimals · 09-23-2009, 08:20 PM

Quote:

Originally Posted by 79gmcc15

I don't think the kick down is for down shifting like the problem he is having. IIRC it is to make it drop down to 2nd gear to help you pass some one or accelerator faster when WOT.

Drop down - down shift, ummm same thing. If the detent cable is not properly adjusted it will not "Down Shift - Drop Down". It was never stated which gear this problem happens in.

LiveAnimals · 09-23-2009, 08:25 PM

http://www.thirdgen.org/detent

Try this^

79gmcc15 · 09-23-2009, 02:09 AM

first, did you check to make sure all the vacuum lines to the trans were in good shape?

79gmcc15 · 09-24-2009, 01:15 AM

I thought that there was a difference. one is for passing and accelerating using the detent cable. you mash down on the go-pedal and it pulls on the cable and makes the trans drop down to 2nd. the other is when you are coming to a stop or let off the accelerator *cable is then slack or no tension on it*. and the trans will start to down shift eventually by its self. without even using the Detent cable. and the later is what I gather is his problem..?

79gmcc15 · 09-26-2009, 11:28 PM

Any word?

supamatic · 09-29-2009, 10:25 PM

what if i run with out dent cable the leak is coming from the u joint close to trans of the two piece drive shaft wants going on hear

79gmcc15 · 09-29-2009, 11:04 PM

it is not advised. it will shorten your trans life. for us to help, can you tell us When it does not down shift?

supamatic · 09-29-2009, 11:46 PM

it does it when im at 50 55 60 thats third anit it i let off gas pedal it like if i slowly press the brake but im not no gluide it doesnt come to a stop just slows down fast

79gmcc15 · 09-30-2009, 01:30 AM

I have the same thing happen to me. I always thought that's how its suppose to be. its kinda like when you down shift to help slow down. I always took that as compression braking. what you could do is when you are in free way speed and am in 3rd gear. mash it down, it "should" drop down to 2nd gear. if it does not then your cable is out of adjustment. when you are coming to a stop and you hear it shift from 3rd to 2nd to 1st then that is normal. then I would say it is OK. I would also wait to see if someone can confirm that.

LiveAnimals · 09-30-2009, 07:37 PM

Sounds good to me

supamatic · 09-30-2009, 11:51 PM

thanks that sounds good it makes sense could it be i have it hooked wrong inside trans and its sticken inside oh yeah how do i adjust it or whatever

09-22-2009, 10:33 PM	#1
supamatic Registered User Join Date: May 2009 Location: phoenix AZ,NOW ON THE DIRTY EAST SIDE IN THE MIDDLE OF THE BAD WEST AND THR RICHICHY SCOTTSDALE Posts: 39	down shift what would cause my truck not to down shift i have 350 motor th350 tranny in a 1976 gmc pickup longbed it feels like im pressing on the brake slowly anyone know __________________ you know who i be

09-22-2009, 11:10 PM	#2
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: down shift Will it shift up by itself? Will it downshift if you do it manually? __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

09-22-2009, 11:20 PM	#3
supamatic Registered User Join Date: May 2009 Location: phoenix AZ,NOW ON THE DIRTY EAST SIDE IN THE MIDDLE OF THE BAD WEST AND THR RICHICHY SCOTTSDALE Posts: 39	Re: down shift yeah itll shift up yes i can do it manually what gives __________________ you know who i be

09-23-2009, 01:10 AM	#4
supamatic Registered User Join Date: May 2009 Location: phoenix AZ,NOW ON THE DIRTY EAST SIDE IN THE MIDDLE OF THE BAD WEST AND THR RICHICHY SCOTTSDALE Posts: 39	Re: down shift k riddle me this what happens if my drive shaft isnt all the way into my tail shaft of my transmission __________________ you know who i be

09-23-2009, 01:12 AM	#5
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,257	Re: down shift The easy fix would be the kickdown cable is off/out of adjustment and the driveshaft should be out an inch or so on slipyoke

09-23-2009, 01:17 AM	#6
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: down shift I don't think the kick down is for down shifting like the problem he is having. IIRC it is to make it drop down to 2nd gear to help you pass some one or accelerator faster when WOT. __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby

09-23-2009, 01:45 AM	#7
supamatic Registered User Join Date: May 2009 Location: phoenix AZ,NOW ON THE DIRTY EAST SIDE IN THE MIDDLE OF THE BAD WEST AND THR RICHICHY SCOTTSDALE Posts: 39	Re: down shift how do u adjust the kick down if this is the problem but my shaft was out to where it was leaking fluid out of shaft it was leaking like crazy __________________ you know who i be

09-23-2009, 08:25 PM	#10
LiveAnimals Registered User Join Date: Dec 2008 Location: Antelope, CA Posts: 681	Re: down shift http://www.thirdgen.org/detent Try this^ __________________ Kameron YESTERDAY IS HISTORY - TOMORROW IS A MYSTERY I'm a Middle ClASS HOLE 07.5 Dodge 3500 CTD -- Daily 73 C10 Factory BB SWB 2WD

09-23-2009, 02:09 AM	#11
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: down shift first, did you check to make sure all the vacuum lines to the trans were in good shape? __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby

09-24-2009, 01:15 AM	#12
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: down shift I thought that there was a difference. one is for passing and accelerating using the detent cable. you mash down on the go-pedal and it pulls on the cable and makes the trans drop down to 2nd. the other is when you are coming to a stop or let off the accelerator cable is then slack or no tension on it. and the trans will start to down shift eventually by its self. without even using the Detent cable. and the later is what I gather is his problem..? __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby Last edited by 79gmcc15; 09-24-2009 at 01:16 AM.

09-26-2009, 11:28 PM	#13
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: down shift Any word? __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby

09-29-2009, 10:25 PM	#14
supamatic Registered User Join Date: May 2009 Location: phoenix AZ,NOW ON THE DIRTY EAST SIDE IN THE MIDDLE OF THE BAD WEST AND THR RICHICHY SCOTTSDALE Posts: 39	Re: down shift what if i run with out dent cable the leak is coming from the u joint close to trans of the two piece drive shaft wants going on hear __________________ you know who i be Last edited by supamatic; 10-18-2009 at 02:22 AM.

09-29-2009, 11:04 PM	#15
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: down shift it is not advised. it will shorten your trans life. for us to help, can you tell us When it does not down shift? __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby

09-29-2009, 11:46 PM	#16
supamatic Registered User Join Date: May 2009 Location: phoenix AZ,NOW ON THE DIRTY EAST SIDE IN THE MIDDLE OF THE BAD WEST AND THR RICHICHY SCOTTSDALE Posts: 39	Re: down shift it does it when im at 50 55 60 thats third anit it i let off gas pedal it like if i slowly press the brake but im not no gluide it doesnt come to a stop just slows down fast __________________ you know who i be Last edited by supamatic; 09-29-2009 at 11:46 PM.

09-30-2009, 01:30 AM	#17
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: down shift I have the same thing happen to me. I always thought that's how its suppose to be. its kinda like when you down shift to help slow down. I always took that as compression braking. what you could do is when you are in free way speed and am in 3rd gear. mash it down, it "should" drop down to 2nd gear. if it does not then your cable is out of adjustment. when you are coming to a stop and you hear it shift from 3rd to 2nd to 1st then that is normal. then I would say it is OK. I would also wait to see if someone can confirm that. __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby



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09-30-2009, 07:37 PM	#18
LiveAnimals Registered User Join Date: Dec 2008 Location: Antelope, CA Posts: 681	Re: down shift Sounds good to me __________________ Kameron YESTERDAY IS HISTORY - TOMORROW IS A MYSTERY I'm a Middle ClASS HOLE 07.5 Dodge 3500 CTD -- Daily 73 C10 Factory BB SWB 2WD

09-30-2009, 11:51 PM	#19
supamatic Registered User Join Date: May 2009 Location: phoenix AZ,NOW ON THE DIRTY EAST SIDE IN THE MIDDLE OF THE BAD WEST AND THR RICHICHY SCOTTSDALE Posts: 39	Re: down shift thanks that sounds good it makes sense could it be i have it hooked wrong inside trans and its sticken inside oh yeah how do i adjust it or whatever __________________ you know who i be Last edited by supamatic; 10-01-2009 at 12:07 AM.

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