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Joined: Jun 2007
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jun 2007
Posts: 45 |
My "41 sedan has started whining badly in 1st and 2nd gear. Also it will even "sort of jump out of 1st" if I do not hold on to the column shifter. 3rd gear - no unusual sound - seems to run well in 3rd.
Is this a possible problem with the transmission? I'm an amature when it comes to cars and appreciate your input.
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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Before giving any advice we need to know if you are still using the original vacuum assist shift. Take a look underneath and on the drivers side of the transmission will be a large 'can' shaped device. This is the vacuum assist shift. Let us know.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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Is the transmission full to the proper level with gear oil?. There is a square pipe plug on the right side of the transmission case. When the plug is removed and you dip the tip of your little finger down into it you should have heavy oil dripping from your finger tip. The transmission holds 1 1/2 pints of gear oil. Common to have it leak out at the ball socket right behind the transmission or drain back thru the tube that the drive shaft is enclosed in and over fill the differential. If diffenential is over filled gear oil will run out when the square plug at the back of the Diff. cover is removed. The excess should be drained off.
The transmission is filled with #90 or preferrably 85W-140 gear oil. In your warmer climate straight #140 can be used. It will help to eleminate clutch chatter/gear rattle. If it is full and still whines it needs rebuilding.
It is normal to have some gear whine noise in the Chevrolet transmission.
Last edited by Chev Nut; 10/14/07 10:03 PM.
Gene Schneider
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ChatMaster - 6,000
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ChatMaster - 6,000
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Gary
If its whining in 1st and 2nd I would suspect the layshaft (cluster shaft) bearings are the cause of the noise. You could try changeing the gearbox oil, if it is discoloured or sparkley you will need to rebuild the box.
I wont comment on "jumping out of gear" with the vacuum assist as I have not seen the system but Ray can give you the correct info there.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Jun 2007
Posts: 45
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jun 2007
Posts: 45 |
As best I can tell, there is no vacuum cylinder. I'll get it on a rack soon so that I can see better and also check liquid levels. I have only had the car for a few months and there has always been some work involved in shifting.
I'm curious. There is also a small (about the size of a can of soup) container on the passenger side all by itself. Would you happen to know what it is?
Thanks for your help.
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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The "can of soup" is the blower motor for your under seat heater.
If the vacuum shift is hooked up and working the car will shift very hard and slow with the motor not running and with just "finger tip" effort with the motor running. This is because the shifting is assisted by engine vacuum. If it has an after market shift kit on it and the vacuum cylinder has been removed you will be lucky if it just "shifts".
The vacuum cyl. is about the size of a generator and is mounted next to and slightly behind the transmission and the left side.
Gene Schneider
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Joined: Jun 2007
Posts: 45
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jun 2007
Posts: 45 |
I got the car on a rack and the transmission was very low on oil. After filling it, the whineing is still present, however not quite as pronounced. What's typically involved in getting rid of the leaking?
Vacuum Cylinder - I don't see one. I've never experienced that "Finger Tip" effort mentioned since I bought the car a few months ago.
Jumping out of first gear - When starting in 1st, at about 16 - 18 MPH, it will jump out of gear consistently. I can hold onto the shifting lever and keep it in 1st and it seems to perform as it should.
Any information from you gentlemen would be appreciated. Thanks.
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Joined: Dec 2001
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ChatMaster - 10,000
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ChatMaster - 10,000
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with these high torque straight six cylinder engines, there is no need to wind them out like a modern import with a stick shift, I use 1st gear to get the car rolling at less than 10 or 12 mph, shift to second and then into high around 25 mph. Less strain, less pain.......
Life's a long winding trail, love Jesus and ride a good horse!
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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Jumping out of 3rd gear-
Inards of transmission worn.
3rd speed shifter fork worn.
Sounds as if vaccum shift is removed and after market shift kit installed. Linkage may be incorrectly adjusted and gears not going all the way into 3rd. (syncro drum actually)
Problem probably related to noise and running low on gear oil didn't help.
Gene Schneider
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