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#1 |
Registered User
Join Date: Nov 2011
Location: Lancaster PA
Posts: 23
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Help needed identifying transmission problem.
Hey Everyone,
My 1971 Chevy C10 pickup is giving me some trouble in the transmission department. A few months back, it started protesting when I would shift from 1st to 2nd (It's a 3-on-the-floor setup in an "H" shape. 1st is lower left, second is upper right.). I noticed that it would shift more easily when the engine was still cold than it would after it warmed up. I also noticed that I could easily shift from Reverse into 2nd if need be, and that there was no trouble between 2nd and 3rd, or with downshifting of any kind. As it got worse and I would be unable to get it into second from first at all without double clutching several times. Eventually, I just gave up and started parking on downhill slopes as much as possible and starting it up in Second. I cringe each time I do it, but I gotta get around somehow. About a month ago, I also noticed that the truck would start to protest and vibrate when accelerating while in reverse. This started to get progressively worse as well until the shaking became unbearable. I now pop it into neutral and push the thing back into my parking spaces in the city with my feet. I'm not making this up. Last week, I noticed that I can no longer put the truck into reverse at all. The stick just won't go in. I have checked all my linkage and it is fine. My friend has suggested that it might be the "syncro", which I am not familiar with. My suspicion is that my 41 year old transmission is calling it quits. Do any of you have any insight into the problem for me, or have some advice on how to investigate the cause of the problem further? Any help at all would be great. Thanks in advance. PS. One more tidbit that might factor in: I changed the clutch in February/March. Perhaps I screwed something up? |
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#2 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Help needed identifying transmission problem.
First check the lube in the transmission and if that's okay, I would suggest remove it and double check the pressure plate, throw out bearing, pilot bushing and clutch plate for any problems. It's possible the synchronizer in the tranny is shot but I would first eliminate the other potential problems.
If the clutch is not releasing it will definitely cause the problem you're having. Also if the pilot bushing is seizing. Clutch and pressure plate contamination or defective can cause the vibrations you're having as well as worn input shaft bearings in the transmission.
__________________
68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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#3 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Help needed identifying transmission problem.
Quote:
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__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#4 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,602
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Re: Help needed identifying transmission problem.
Could be a broken motor mount, tranny mount or steady bearing is shot too!
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#5 | |
Registered User
Join Date: Nov 2011
Location: Lancaster PA
Posts: 23
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Re: Help needed identifying transmission problem.
OK, since I'm newish to this sort of work, I'll ask a few obvious questions here... Thanks again for helping me out.
My understanding of how to check the lube in the transmission is to remove the plug in the side of the transmission and stick my finger in there one knuckle deep and feel for the lubrication level. Is that method accurate? Quote:
Assuming the clutch checks out, what steps will I need to take to investigate if the input shaft bearings in the transmission are worn down? |
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#6 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Help needed identifying transmission problem.
Fluid: I just fill the transmission until it just start to ooze out of the top hole.
Even though you just replaced the clutch/pressure plate they could be defective. Parts are not what they used to be, especially if you bought at the local auto parts store. Also, you may be able to look to see if the clutch disc is being released by having someone depress the pedal while you observer from underneath. Don't overlook the pilot bushing. It's possible it's binding and grabbing the input shaft. To check the input shaft bearing you basically see if the bearing is noisy or wobbly. These are all preliminary checks before you take the transmission in to have a shop look at it. I've replaced the synchro in the past but it's been many, many years ago. If that turns out to be the culprit, I'd have a shop do it, though. It can turn out to be a big pain. And don't overlook the salvage yards for a replacement transmission. I picked my saginaw about 15 years ago for about $30. There are a lot of vehicles that used these type of transmission back in those days.
__________________
68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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#7 |
Registered User
Join Date: Nov 2011
Location: Lancaster PA
Posts: 23
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Re: Help needed identifying transmission problem.
Thanks, that is all very helpful and reassuring.
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#8 | |
Registered User
Join Date: Nov 2011
Location: Lancaster PA
Posts: 23
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Re: Help needed identifying transmission problem.
Quote:
"I pulled it from my truck to put in a 4 speed. It has a decent amount of play in the shaft... I would recommend replacing the bearings at least on the front of the trans. It worked when I pulled it but I would at least pull the cover and check the gears " Also, my truck is a 71 C10, the transmission is of an 82 C10. Does that mean it won't fit then? With all that in mind, does that sound like a good deal to you? |
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#9 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Help needed identifying transmission problem.
For 50 bucks your basically buying a core that needs rebuilt. I would bother with it if you dont have the ability to rebuild it yourself.
__________________
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. |
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#10 |
Registered User
Join Date: Nov 2011
Location: Lancaster PA
Posts: 23
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Re: Help needed identifying transmission problem.
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#11 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Help needed identifying transmission problem.
Quote:
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__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#12 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Help needed identifying transmission problem.
That should have read Would not bother with it. A second transmission with issues isnt going to do you much good.
__________________
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. |
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#13 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
|
Re: Help needed identifying transmission problem.
Quote:
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__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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reverse, shifting problems, three speed, transmission |
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