3.50 Gear removing
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Elder User
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From: azle texas
3.50 Gear removing
I am going to be driving my 70 f100 to SE Kansas to hunt this year, so I am changing my gears for better gas mileage. It is the first time for me to change the gears. Already got the gears out and got a match for splines. Installed new bearings about a year ago with seals. I was told to use black silicone for the seal. Is there a gasket for the pumpkin? Any tips for this change over you might have would be helpful.
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
70T, The gasket is very thin like a sheet of paper. I have seen a lot of rust/red looking sealant used as well as other colors. You wouldn't need a high temp one, but silicone alone should be fine. It wasn't as widely used or may not have been available when out trucks were new.
You will need to change your speedo gear with the rear gear change.
John
You will need to change your speedo gear with the rear gear change.
John
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Originally Posted by 70T351W
I am going to be driving my 70 f100 to SE Kansas to hunt this year, so I am changing my gears for better gas mileage. It is the first time for me to change the gears. Already got the gears out and got a match for splines. Installed new bearings about a year ago with seals. I was told to use black silicone for the seal. Is there a gasket for the pumpkin? Any tips for this change over you might have would be helpful.
2-C9AZ-1177-A .. Axle Seal (replaced B7A-1177-A)
>> 1-E3TZ-4035-B .. Gasket, Carrier to Housing (replaced B7A-4035-A) <<
1-B7A-4669-A .. Pinion Bearing Retainer O Ring
1-B7A-4662-A .. Crush Sleeve
1-C2AZ-4676-B .. Pinion Seal
Last edited by NumberDummy; Aug 8, 2007 at 07:34 AM.
Lead Driver
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From: Central Oregon
If you are changing the gears for going hunting, are you going to change them back later? If you are look into getting another 3rd member with the gears you want to run, so with 2 differant gear set-ups you can switch back and forth without tearing the 3rd member down each time.
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From: azle texas
Originally Posted by jwtimme
ther is a gasket for the pumkin, your best bet is to buy a kit that includes a new crush sleeve and shims. a dile indicator with a magnetic base come in handy when setting the backlash.
Would it be wise to do all of this? Would it be difficult to install?
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From: azle texas
Originally Posted by jowilker
You can change the center section in about an hour, if you had everything laid out.
John
John
Dont mean to sound dumb, What do you mean by the center section? The pumkin?
Laughing Gas
Joined: Nov 2000
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From: tulsa
Yes when he says center section it is the same as the pumpkin or 3rd member. And like some of the other posts said if you are going to swapping gears a lot it might be wise to find anther 3rd member and install your new gears in it. If you install gears in the 3rd member you have you will need to install a new crush sleeve at a minimum that’s if you keep from tearing up any of the other parts. And you will need to set the backlash so a dial indicator will be needed. Also you will need to break the new gears in like breaking in a new motor, run the truck a few miles to heat them up then park it and let cool, and do it again several times before you go on a long haul or the gears may become soft.
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
70T, Your F350 does not have a a Ford 9 inch in it. It is the Ford 9" that is easily swappable. Every Nascar race car runs a variation of the 9 Inch today.
There are several different names for the removable center section, Hogs head, Pumpkin, Chunk, etc. As long as the axle spline count is the same, you can swap a 4.11 ratio out for a 3.00 ratio or any other ratio and be on the road in about an hour.
John
There are several different names for the removable center section, Hogs head, Pumpkin, Chunk, etc. As long as the axle spline count is the same, you can swap a 4.11 ratio out for a 3.00 ratio or any other ratio and be on the road in about an hour.
John
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From: azle texas
Originally Posted by jowilker
70T, Your F350 does not have a a Ford 9 inch in it. It is the Ford 9" that is easily swappable. Every Nascar race car runs a variation of the 9 Inch today.
There are several different names for the removable center section, Hogs head, Pumpkin, Chunk, etc. As long as the axle spline count is the same, you can swap a 4.11 ratio out for a 3.00 ratio or any other ratio and be on the road in about an hour.
John
There are several different names for the removable center section, Hogs head, Pumpkin, Chunk, etc. As long as the axle spline count is the same, you can swap a 4.11 ratio out for a 3.00 ratio or any other ratio and be on the road in about an hour.
John
John just to clear the air, I aint talkin about doing any swappin on my F350. Just haul-n-. Thanks for the info though.
Fleet Owner
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From: Creedmoor, North Carolina
Originally Posted by 70T351W
John just to clear the air, I aint talkin about doing any swappin on my F350. Just haul-n-. Thanks for the info though.
I am going to be driving my 70 f100 to SE Kansas to hunt this year, so I am changing my gears for better gas mileage.
John