66 F100 Differential Drain Plug???
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66 F100 Differential Drain Plug???
I went to drain and refill my differential today with fresh gear oil and could not for the life of me find a drain plug on the bottom of the "pumpkin". Do some differentials not have drain plugs?
Last edited by Enzo500; Sep 5, 2006 at 07:02 PM.
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
They do not. You will have to loosen all of the nuts and drive a pinchbar/screwdriver between the chunk and housing to allow the grease to flow out.
It will be a good time to check the vent and see if it is open, while you are under there.
John
It will be a good time to check the vent and see if it is open, while you are under there.
John
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Joined: Apr 2004
Posts: 289
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From: Raleigh, NC
Enzo500,
As mentioned before, you can use an oil suction hose (about 1/4 inch dia.) through the fill plug hole, you can pop off the front of the differential after dropping the driveshaft (more labor intensive including gasket and crush seals), or pull one axle and elevate the other side (not recommended because you couldn't get enough oil out and the elevation would be dangerous). The best way to completely remove the 90W oil is to pull the pumpkin. Then you have the ability to inspect axles and bearings, center section & gears, and you will be able to wipe any build-up from the bottom of the axle housing.
As mentioned before, you can use an oil suction hose (about 1/4 inch dia.) through the fill plug hole, you can pop off the front of the differential after dropping the driveshaft (more labor intensive including gasket and crush seals), or pull one axle and elevate the other side (not recommended because you couldn't get enough oil out and the elevation would be dangerous). The best way to completely remove the 90W oil is to pull the pumpkin. Then you have the ability to inspect axles and bearings, center section & gears, and you will be able to wipe any build-up from the bottom of the axle housing.
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From: willamette valley ore
Enzo, I was surprised to find out as you did that there is no drain plug for the diff. Well guess what? There is one there now. I drilled and tapped for a 1/4" pipe plug ( can't remember the drill size right off ) . I've been changing the diff lube every two years since then and it works great. I use a little teflon tape when reinstalling the plug and all is well. After I tapped the drain hole, I flushed out the housing with safety solvent twice to get out any small metal pieces that may have gotten up into the housing. Drill slowly and use copious amounts of WD40 to wash away the fillings before you get all the way through the housing. I had success minimizing the amount of filings as very few washed out with the solvent. I then changed the gear lube after about 100 miles but I found nothing in the lube. Steve
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Originally Posted by 59INA40
Enzo, I was surprised to find out as you did that there is no drain plug for the diff. Well guess what? There is one there now. I drilled and tapped for a 1/4" pipe plug ( can't remember the drill size right off ) . I've been changing the diff lube every two years since then and it works great. I use a little teflon tape when reinstalling the plug and all is well. After I tapped the drain hole, I flushed out the housing with safety solvent twice to get out any small metal pieces that may have gotten up into the housing. Drill slowly and use copious amounts of WD40 to wash away the fillings before you get all the way through the housing. I had success minimizing the amount of filings as very few washed out with the solvent. I then changed the gear lube after about 100 miles but I found nothing in the lube. Steve
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From: QLD Australia
i will second that. iv not messed with mine too much, but thats certainly worthy of drilling and tapping if I ever seen it. where about on the sucker did you place the plug?
can you post a piccy of it?
can you post a piccy of it?
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From: willamette valley ore
The '66 just went off to college with my son so pictures will have to wait until he comes home during the holidays. I will call him and see if he will measure the location. The hole has to favor the rear a bit to avoid the internal webbing of the casting. It does not let 100% of the lube out but much more that siphoning and way easier. Steve
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