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Checking Transmission Fluid

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Old May 7, 2009 | 03:52 PM
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Checking Transmission Fluid

i've been trying to avoid asking this question... but, on a 49 with an I6 and 3 speed manual transmission, how do you check and top off the transmission fluid? There isn't a dip stick nor fill tube!

Do i need to pull up the floor cover in the cab?
 
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Old May 7, 2009 | 05:31 PM
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Several ways to do it.
The plug to check the fluid is on the right side of the tranny about half way up the case. It has a square pipe plug head.
You can put the truck on jack stands, a lift or remove the tranny cover to access the plug.
remove plug - if fluid runs out = replace plug, if no fluid, stick pinkie (unless you have sausage fingers) into hole and bend down at first knuckle if to touch fluid you're good to go.
If you can't touch fluid you need to add 90 weight GEAR lube - depending on your access you can use anything from a pump - funnel and hose to a trukey baster.
Have fun and 90 weight GEAR lube stinks worse than poop.
 
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Old May 7, 2009 | 06:12 PM
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Originally Posted by 4tl8ford
Have fun and 90 weight GEAR lube stinks worse than poop.
I couldn't agree more
 
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Old May 8, 2009 | 09:29 AM
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hmm... do you guys think it'll be worth it to just drain the current fluid and replace it all at this time? i've got the truck up and working on the brakes at this time, and i doubt the fluids been changed any time in the last 2 decades. Preventative maintance?
 
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Old May 8, 2009 | 09:54 AM
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Originally Posted by Links_vette
hmm... do you guys think it'll be worth it to just drain the current fluid and replace it all at this time? i've got the truck up and working on the brakes at this time, and i doubt the fluids been changed any time in the last 2 decades. Preventative maintance?
I would. Due to wear over time the fluid will have fine metal particles/shavings that can cause excessive wear to the gears and soft metal.

Each time a get a used vehicle, I replace all the fluids and begin new maintenance records.
 
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Old May 8, 2009 | 03:06 PM
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Originally Posted by Links_vette
hmm... do you guys think it'll be worth it to just drain the current fluid and replace it all at this time?
I would change the current fluid. There is no way to know what gear oil is in there and the different grades of oil do not mix. If it has the older GL1 oil in it and you top it off with GL4 or GL5, you will end up with a tar-like substance instead of lubricant.
 
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Old May 8, 2009 | 05:45 PM
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Originally Posted by mechmagcn
I would change the current fluid. There is no way to know what gear oil is in there and the different grades of oil do not mix. If it has the older GL1 oil in it and you top it off with GL4 or GL5, you will end up with a tar-like substance instead of lubricant.
I dont know how true this is but ive been told to avoid GL4 and GL5 to go for GL1 I think it is on older cars as far as rear axles goes cause GL4 and GL5 eats up brass components and the timkin axle in my 56 most likely has brass parts.

How true is that?
 
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Old May 11, 2009 | 08:31 AM
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My neighbor is going to aquire a "sample bucket" of synthetic gear oil from the place he works... once that's in the truck all i'll have to do is figure out what to do with the left over 4.5 gallons of oil.
 
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