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Old 10-19-2020, 11:08 AM   #1
MCB-12NAM
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Default Jacking 1939 model 91A

If I place the jack under the rear bumper arms as depicted in the Ford "Reference Book," the body goes up but not the tires. What am I doing wrong?
Otherwise, my only alternative is to use a floor jack under the differential? This would not be practical if I had a flat out on the road.
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Old 10-19-2020, 11:41 AM   #2
rotorwrench
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Default Re: Jacking 1939 model 91A

The suspension has a lot of give to it. It takes a good bit of jacking to completely unload the springs and start lifting a tire off the ground. If it runs out of jack before it gets off the ground then a person would need some cribbing to go under the jack. If I was to add something under it, Id go with some short 2 X 12 lumber pieces to help stabilize the jack on soft ground. Jacking can be a dangerous task so choose your supports carefully.

Last edited by rotorwrench; 10-19-2020 at 11:46 AM.
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Old 10-19-2020, 12:06 PM   #3
alanwoodieman
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Default Re: Jacking 1939 model 91A

buy you a small floor jack, add a piece of 2 x 12 about 24" long and you will safely be able to jack up your car. put piece of wood on ground and roll the jack on it till it is under the axle near the spring hanger on the side you want to jack up or under the center to jack up both wheels on rear /front
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Old 10-19-2020, 02:01 PM   #4
JSeery
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Default Re: Jacking 1939 model 91A

Bumper type jack were always like that, you have to jack the bumper way up to get a tire to clear.
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Old 10-19-2020, 02:11 PM   #5
51woodie
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Default Re: Jacking 1939 model 91A

I carry a hydraulic bottle jack in my '46 Coupe, in case I have to change a flat. Also have CAA/AAA membership that will look after me if needed. Some people use a scissor jack, like the types that come with modern cars (available from auto recyclers) to jack under the axle.
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Old 10-21-2020, 07:58 AM   #6
aussie merc
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Default Re: Jacking 1939 model 91A

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as AC/DC said its a long way to the top and hope it dont roll yeh i keep some fold up wheel chocks and a good piece of hardwood thats about 9"square x 2" thick generally does the trick
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Old 10-21-2020, 04:21 PM   #7
Clem Clement
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Default Re: Jacking 1939 model 91A

I'm with i you guys. A bumper jack will kill you pretty near dead. I have a wet jack in my 39 peekup
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Old 10-22-2020, 04:16 PM   #8
MCB-12NAM
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Default Re: Jacking 1939 model 91A

Thanks to all for the suggestions. I am now the proud owner of a 1.5 T floor jack which will be in the trunk along with a short length of 2 X 12 & 2 chock blocks. As the jack is aluminum & steel, it only weighs a little less than 40 Lbs. Got a bonus from jacking at the mid point of the front axle as I found a zert in the front spring that I had missed (should have known better as I had greased the rear spring). I greased the springs using the John Deere corn head grease someone had suggested in an earlier post for this application. It migrated perfectly through the leafs in both directions but not quite to the ends. Was duly impressed.
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Old 10-22-2020, 07:02 PM   #9
Clem Clement
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Default Re: Jacking 1939 model 91A

WOW. I have used Cornhead grease but can't see the grease come out anywhere. I'm messing with fifth wheel grease at the moment
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Old 10-22-2020, 08:46 PM   #10
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Default Re: Jacking 1939 model 91A

Is the corn head grease similar to the old “double ought” grease ?
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