Latest Forum Post
04 Chevy 2500hd tail light issues
Help!!! I have changed my combo switch...
1999 Grand Caravan Sport not starting.
Hi. I'm new here. I hope someone can hel...
Brake Seals Bulging
2021 Toyota Corolla LE 1.8l 65,000 mile...
Engine blew up after oil change, is mechanic responsible?
Hello, I have a 2007 Hyundai Elantra wit...
Changed pads and now brake pedel goes to the floor
I am not much of a mechanic, and needed ...
Equinox air conditioning issue, help please!
I have a 2020 Chevrolet Equinox that has...
2005 Maxima overheats only when idling but engine temp comes down immediately if I rev up the engine (even though car is stationary)
hello everyone, I own a 2005 Nissan M...
Brake & Turn Signal Out - One side only
2002 Ford Ranger 3.0 V6, 5-speed manual ...
Seeking Advice: Strange Noise in 2017 Nissan Versa Note, Mechanic Stumped
Hey everyone, A few weeks ago, my mom's...
Replacing Tires
My daughter just purchased a 2013 Honda ...
|
|
GlennC1
Novice
Nov 30, 2015, 12:38 PM
Post #1 of 6
(1932 views)
|
I have a '79 Buick with a TH350 non lock-up. It has worked fine after being rebuilt a few years ago. Now it wont up-shift. First and reverse is all I have. This happened immediately after I had to "floor it" to get out of another cars way. Since it was working fine before this I suspect something broke or stuck in the valve body or governor. The kick down cable has been disconnected for years,in case that has anything to do with it. I tried shifting it manually going from 1st to 2nd, it wont up-shift that way either. I don't want to take the trans out of the car if I don't have to. If anybody has any suggestions or ideas that would point me in the right direction I would appreciate it. Thanks.
|
|
| |
|
kev2
Veteran
Nov 30, 2015, 2:35 PM
Post #2 of 6
(1922 views)
|
Re: TH350 No shift
|
Sign In
|
|
might ck vacuum modulator- is there vac at modulator? do not want to see any trans fluid in vac line.
(This post was edited by kev2 on Nov 30, 2015, 2:37 PM)
|
|
| |
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 30, 2015, 2:38 PM
Post #3 of 6
(1921 views)
|
Re: TH350 No shift
|
Sign In
|
|
Site has a working transmission expert I hope stops by but have some suggestions: If that kick down cable to the carburetor was/is broken in what way? Cable or can't hook it up and could it be pulled making trans think you are pedal to the metal or at full throttle? Not sure if this year also used a vacuum diaphragm you can look for one on side with a hose as that too if hose has no vacuum will cause trans to hang onto lower gears to the limits of RPM generally forced upshifts to second @ about 40MPH and third @ about 70-75MPH or so by a governor. That can be overridden with your shifter if physically not in correct position at trans or inside goes to valve body. Owned the exact year and trans in an Electra for years and can't recall every detail of how it shifted. Cable, vacuum and a centrifugal governor forced upshifts except as said if locked into lowest gear only or trans needs another overhaul IMO, T PS: Vacuum hose just falling off if mushy at either end could do this on some - check and hope it's that simple. If wet at a diaphragm with ATF that diaphragm has to be replaced and can swell hose to fall off too...........
(This post was edited by Tom Greenleaf on Nov 30, 2015, 2:48 PM)
|
|
| |
|
gsferraro
Veteran
Nov 30, 2015, 5:07 PM
Post #4 of 6
(1911 views)
|
Re: TH350 No shift
|
Sign In
|
|
Hello, First pull off the modulator hose, the modulator is located right rear of trans, make sure no fluid comes out, if no fluid comes out, with the hose dissconnected start the car and make sure you have vacuum at the hose by putting your finger to block the hole of the rubber hose, you should feel vacuum, if you dont follow the line upto the engine and see if its off on top. If that is ok, on the left rear of the trans you will see a cover(next to speedo cable) behind that cover is the transmission govenor, its common for the govenor gear to strip or apple core. The govenor works on centrifugal force as it spins the trans will shift, if it doesnt spin the trans will stay in first gear. Gary
|
|
| |
|
GlennC1
Novice
Dec 3, 2015, 9:47 AM
Post #5 of 6
(1872 views)
|
Re: TH350 No shift
|
Sign In
|
|
Turned out to be just a broken vacuum line. Thanks for the help.
|
|
| |
|
gsferraro
Veteran
Dec 3, 2015, 11:44 AM
Post #6 of 6
(1867 views)
|
Re: TH350 No shift
|
Sign In
|
|
Glad you got it fixed. Gary
|
|
| |
|