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#1 |
Registered User
Join Date: Sep 2008
Location: Yukon OK
Posts: 70
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68 GMC transmission problem
My sons 68 GMC pu won't go. Put it into any gear and it sits like it's in neutral. The linkages are ok and if you push it after it warms up, it'll go. Any ideas what it could be? we dumped half a quart of lucas oil into it to help and to bring the level up to normal, but it's still doing it. Any ideas/suggestions will be greatly appreciated.
Thanks
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'67 Chevy C10 '68 GMC PU '98 Turd F150 4x4 (I think it may be a chevy under the logo it's such a good truck) '10 Mustang "Life's tough - it's even tougher if you're stupid." John Wayne |
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#2 |
Registered User
Join Date: Apr 2009
Location: MI
Posts: 88
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Re: 68 GMC transmission problem
No sure if I missed it, but what kind of trans?
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68 C-10 Panel (fixing) 250-6,3ott 93 k1500 pickup DD "When a man is old enough to figure out his dad was right, he has a son who thinks he's wrong" Charles Wadsworth |
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#3 |
Registered User
Join Date: Aug 2001
Location: rock island,il,usa
Posts: 5,382
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Re: 68 GMC transmission problem
You could drop the pan, & see if the filter is clogged. Also look at the color of the fluid in the pan....if it looks like silver paint, you have a bunch of metal, or blacken than coal= burnt clutches). what trans does it have? best of luck,crazy Al
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#4 |
Registered User
Join Date: Sep 2008
Location: Yukon OK
Posts: 70
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Re: 68 GMC transmission problem
Sorry, it's a 350 (I think) automatic.
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'67 Chevy C10 '68 GMC PU '98 Turd F150 4x4 (I think it may be a chevy under the logo it's such a good truck) '10 Mustang "Life's tough - it's even tougher if you're stupid." John Wayne |
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#5 |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
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Re: 68 GMC transmission problem
THE BAD NEWS IS.. I'LL BET IF YOU REMOVE THE PAN.. YOU'LL FIND A TABLESPOON OR TWO OF SILVER & BLACK SHAVINGS IN IT. THE GOOD NEWS IS THEIR CHEAP (COMPAIR TO ANY ELECTRONIC O-D TRANNY) & EASY ENOUGH TO REPLACE. GOOD EXPERINCE FOR BOTH OF YOU I'LL BET.
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#6 | |
Registered User
Join Date: Aug 2001
Location: rock island,il,usa
Posts: 5,382
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Re: 68 GMC transmission problem
Quote:
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 68 GMC transmission problem
Are you checking the fluid level with the engine running and after going through all the gears? It sounds like the fluid level is low.
Not to downplay what everyone else said, if the fluid is anything but red, it has an expiration date |
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#8 |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
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Re: 68 GMC transmission problem
I HOPE IT'S SOMETHING SIMPLE LIKE .. A FILTER OR FLUID... BUT SOMETHING TELLS ME (MAYBE IT'S CAUSE I RAISED THREE BOYS) BUT I WOULDN'T GIVE A BUCKET OF WARM HORSE PISS FOR THAT TRANNY.S FUTURE.
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#9 |
Registered User
Join Date: Aug 2001
Location: rock island,il,usa
Posts: 5,382
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Re: 68 GMC transmission problem
Im with you on all that John. The one trans that comes to mind is that old Power glide.....if it was full of varnish, a screen & fresh fluid would fix the problem(assuming no metal or clutch junk in the bottom). That is why I suggested dropping the pan(whats inside the pan will pretty much tell the story)
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#10 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 68 GMC transmission problem
I'll stand up for the kid though...
Assuming the pan is filled with silver/black sediment... The tranny may have been in self destruct mode before your son ever laid his foot into it. While he has probably spun the tires in it a few times, unless he's been going through rear tires like crazy, I wouldn't blame him for the damage done to the trans. It's an old truck, and there's no telling how long that trans has been in service, or how the previouse owner treated it. The sad truth is, the average joe never thinks about doing a fluid and filter flush on a tranny, until the fluid is black or the trans is slipping. By then, in all reality, it is too late. Now, if the boy has been killing tires left and right, then maybe he should fund the rebuild on his own. I'd be willing to bet he'd treat it with a little more respect after a few C-notes are spent on repairs. |
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#11 | |
Registered User
Join Date: Aug 2001
Location: rock island,il,usa
Posts: 5,382
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Re: 68 GMC transmission problem
Quote:
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#12 |
Junior Member
Join Date: Jun 2000
Location: Oakridge, Oregon
Posts: 138
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Re: 68 GMC transmission problem
i had a similar condition on an old mail jeep i bought from the postal service..when it was cold..started and wouldnt go anywhere..then after it warmed up enough,would go..and once hot was like normal. turned out the filter had a crack in the side where it drew it up into the valve body,so sucked air.check the fluid with the stick,if its dark and smells burned,its toast..red and smaells like oil,drop pan and check it.
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67-72 Truckless for the moment ![]() Member# 1126 The one that got away http://customclassictrucks.com/featu...001/index.html |
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#13 |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
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Re: 68 GMC transmission problem
BELIEVE ME WHEN I SAY I'M NOT PICKEN ON THE KID. IF HE DROVE LIKE AN OLD LADY I WOULD WONDER.
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#14 |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,372
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Re: 68 GMC transmission problem
Does the steering column shift indicator have 2 or 3 forwards? 1968 pickups used the 2 speed powerglide or 3speed 400 hydramatic.The T 350 was first introduced on 1969 pickups. Regardless, it sounds like its rebuild time.
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#15 |
Registered User
Join Date: Sep 2008
Location: Yukon OK
Posts: 70
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Re: 68 GMC transmission problem
Thanks for the wealth of info. Fluid check shows the fluid is still red. We'll drop the pan when he gets back home. Thanks again to all of you for your input and suggestions. Will let you know how it turns out.
Thanks!
__________________
'67 Chevy C10 '68 GMC PU '98 Turd F150 4x4 (I think it may be a chevy under the logo it's such a good truck) '10 Mustang "Life's tough - it's even tougher if you're stupid." John Wayne |
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#16 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: 68 GMC transmission problem
I'd be testing the line pressure cold and warm in all 4 ranges.
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