Ford Manual 3 Speed Fluid
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Elder User
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Ahhh, Rich would the 75-90w be red in color by any chance? The reason I ask is my 1969 F100 is dripping red fluid out of the rear seal. I bet the PO used ATF !!!!
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Joined: Mar 2013
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From: Phoenix, Az.
2X on the 75-90w gear oil. I wouldn't use synthetic on a old trans with synchros that aren't exactly in diapers.
Synthetic lubricates TOO well in an old tranny IMHO. Get that red ATF outta there.
Synthetic lubricates TOO well in an old tranny IMHO. Get that red ATF outta there.
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Jeff, how difficult is it to replace that rear transmission seal?
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From: Cupertino
ATF was and probably still is used in four-speeds on the dragstrip. The buzz was that it reduces friction between the gears. Guys used it until it leaked out of the seals and wet the clutch.
Use 90w gear lube as above.
Use 90w gear lube as above.
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Thanks Cougar, would you say that if it's dripping out the rear seal, it may be just because the ATF is too thin? Or is it more possible the seal is shot?
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Posting Guru
Joined: May 2001
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From: Cupertino
Drain what is in and replace with gear lube. There is a good chance your problem will go away. If not, the seal is no big headache. You pull down the driveshaft and the replacement is simple.
The front seal is the bigger headache. You must pull the transmission.
The front seal is the bigger headache. You must pull the transmission.
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Joined: Mar 2013
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From: Phoenix, Az.
I don't remember now if that output seal is a lip style or just a plain push in one. If it is a lip style just use a chisel and a hammer under the lip to tap it out.
If it is a plain one like the pic below there is a seal remover made that is a mini slide hammer. You drill a couple opposing holes in the metal wall of the seal, screw the tool's tip in to the 1st hole, then use the slide hammer portion to pull that side of the seal. Then repeat on the other side. The seal should be out by then.
If you don't have one of those tools you can get by with a screw and side cuts. Drill the same holes as above. The size of the holes depending on the diameter of the screw(s) you're using. Grab on to the ist side screw with the tip of the side cuts. Do this over the end of the output shaft so you can use it to get leverage via the fulcrum effect. That leverage will help you pull that 1st side of the seal out easier. Then repeat on the other side of the seal.
If it is a plain one like the pic below there is a seal remover made that is a mini slide hammer. You drill a couple opposing holes in the metal wall of the seal, screw the tool's tip in to the 1st hole, then use the slide hammer portion to pull that side of the seal. Then repeat on the other side. The seal should be out by then.
If you don't have one of those tools you can get by with a screw and side cuts. Drill the same holes as above. The size of the holes depending on the diameter of the screw(s) you're using. Grab on to the ist side screw with the tip of the side cuts. Do this over the end of the output shaft so you can use it to get leverage via the fulcrum effect. That leverage will help you pull that 1st side of the seal out easier. Then repeat on the other side of the seal.
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Elder User
Joined: May 2017
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I don't remember now if that output seal is a lip style or just a plain push in one. If it is a lip style just use a chisel and a hammer under the lip to tap it out.
If it is a plain one like the pic below there is a seal remover made that is a mini slide hammer. You drill a couple opposing holes in the metal wall of the seal, screw the tool's tip in to the 1st hole, then use the slide hammer portion to pull that side of the seal. Then repeat on the other side. The seal should be out by then.
If you don't have one of those tools you can get by with a screw and side cuts. Drill the same holes as above. The size of the holes depending on the diameter of the screw(s) you're using. Grab on to the ist side screw with the tip of the side cuts. Do this over the end of the output shaft so you can use it to get leverage via the fulcrum effect. That leverage will help you pull that 1st side of the seal out easier. Then repeat on the other side of the seal.
If it is a plain one like the pic below there is a seal remover made that is a mini slide hammer. You drill a couple opposing holes in the metal wall of the seal, screw the tool's tip in to the 1st hole, then use the slide hammer portion to pull that side of the seal. Then repeat on the other side. The seal should be out by then.
If you don't have one of those tools you can get by with a screw and side cuts. Drill the same holes as above. The size of the holes depending on the diameter of the screw(s) you're using. Grab on to the ist side screw with the tip of the side cuts. Do this over the end of the output shaft so you can use it to get leverage via the fulcrum effect. That leverage will help you pull that 1st side of the seal out easier. Then repeat on the other side of the seal.
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I'll try it this way first, thanks !
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Elder User
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Perfect John, thanks again
Hey where did you find your manual?