how do I tell?
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Cargo Master
Joined: Mar 2008
Posts: 2,409
Likes: 1
From: Goliad, Texas
how do I tell?
<TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" UNSELECTABLE="on" width="100%"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">when we bought my truck in May 2007 my dad got his buddy to come over and see it (the guy knows a lot about old cars/trucks). so we were looking at it and we started and he said, "What is that exhaust?" he looked and it was Flowmaster. while he was looking he just glanced and saw the Ford 9" rear. he said, "How much did y'all pay for this truck?" we said, "$2900." he said, "That rear end under there is worth more than what y'all paid for the truck."
I was just wondering if this is true or not?
also he said if you want to change the gears from a 3.73 to a 4.10 you'll have the job done in 30 minutes. take the bolts off the housing, pull the gears out, put the new gears in, put the bolts back on.....done. I was just wondering if this stuff is true or not?
oh and how do you tell what kind of rear end it is?
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I was just wondering if this is true or not?
also he said if you want to change the gears from a 3.73 to a 4.10 you'll have the job done in 30 minutes. take the bolts off the housing, pull the gears out, put the new gears in, put the bolts back on.....done. I was just wondering if this stuff is true or not?oh and how do you tell what kind of rear end it is?
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Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
while the 9" is a fairly decent axle, you can get one for under 500 with some goodies. Anytime I've been around a gear change regardless of axle, it has taken the better part of an afternoon. Don't mean to burst your bubble...and no disrespect, but I wouldn't have that buddy work on anything important on your rig with the statements you relayed in the thread.
There are enough Trucks and Vans from the 60's, 70's and 80's alone to keep this rear end low in price for years to come.
Now a Dana axle on the other hand....
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
In 1979? I'd say the 2.75 with the 300-I6.
Fuel Mileage was very high on consumers minds back in circa 1979, due to the OPEC oil embargo.
Fuel Mileage was very high on consumers minds back in circa 1979, due to the OPEC oil embargo.
Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
I don't know about a '79 but the '73 and '74 I had were 3.70s
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Elder User
Joined: Apr 2003
Posts: 502
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Ford 9"
The Only improvement would be a full floating outer axle kit...
My 74 F-100 had a 3:55 limited slip-it worked awesome, and I still have the center section.
Do a search on Ford 9" tons of info, some are 28 spline(cars), some 31, some even had 35 spline from the factory-Early Bronco stuff.
The 70 Boss 429 Mustang had a 9" with I think 4:10 and a locker.
Any performance bow tie car, and even alot of trucks will have a ford 9", or be spending wads on a crappy 12 bolt.
The Only improvement would be a full floating outer axle kit...
My 74 F-100 had a 3:55 limited slip-it worked awesome, and I still have the center section.
Do a search on Ford 9" tons of info, some are 28 spline(cars), some 31, some even had 35 spline from the factory-Early Bronco stuff.
The 70 Boss 429 Mustang had a 9" with I think 4:10 and a locker.
Any performance bow tie car, and even alot of trucks will have a ford 9", or be spending wads on a crappy 12 bolt.
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Elder User
Joined: Apr 2003
Posts: 502
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Oh I forgot,
I beat the living hell out of a stock 81 bronco 9" 3:50-1 gears, never even changed the diff oil, turning 33" mudds, and then 35" mudds behind a 69 429, all this in an 88 F-150 chassis.
Hell beat, mud raced, the only survivors were the 429 and the 9"
Center section swap=easy
Gear set up=easy
Enjoy the best built Ford rear axle.
I beat the living hell out of a stock 81 bronco 9" 3:50-1 gears, never even changed the diff oil, turning 33" mudds, and then 35" mudds behind a 69 429, all this in an 88 F-150 chassis.
Hell beat, mud raced, the only survivors were the 429 and the 9"
Center section swap=easy
Gear set up=easy
Enjoy the best built Ford rear axle.
More Turbo
Joined: Apr 2004
Posts: 673
Likes: 4
From: nortonville illinois
is it one of the nodualar rears? Kevinstang's Ford Nine Inch Differential Page +
those are very popular with drag raceing...or any raceing to be honest. im not sure what they came in though.
EDIT from the posted site- " The case of course most desirable is the N case, first used on the 427 Galaxies around 64-65 I believe.They are most often found behind the later 428CJ and 429CJ cars.From what I have seen don't expect to find them in 390 or 289 Hipo cars.The N cases went with 31 spline centers and are for rugged duty.And believe it or not, they were also used in some FE equipped Ford 1/2 ton 4X4 pickups! "
and to pull a 9 apart, pull tires, pull hubs, 4 axle bolts on each side, pull axles, 10 bolts in center section, and done....any 9 inch
those are very popular with drag raceing...or any raceing to be honest. im not sure what they came in though.
EDIT from the posted site- " The case of course most desirable is the N case, first used on the 427 Galaxies around 64-65 I believe.They are most often found behind the later 428CJ and 429CJ cars.From what I have seen don't expect to find them in 390 or 289 Hipo cars.The N cases went with 31 spline centers and are for rugged duty.And believe it or not, they were also used in some FE equipped Ford 1/2 ton 4X4 pickups! "
and to pull a 9 apart, pull tires, pull hubs, 4 axle bolts on each side, pull axles, 10 bolts in center section, and done....any 9 inch
Last edited by tude; May 30, 2008 at 01:03 AM. Reason: edited it
Senior User
Joined: Feb 2008
Posts: 183
Likes: 0
From: Southeast Iowa
I think the most common gears you're going to find in late 70's ford trucks, is 3.50. It's all I seam to find...
Oh and seriously, it's going to take a while to change gear size in any rearend. The 9 inch is popular because you can have an extra third member on hold incase the one in the car/truck explodes, you can do the swap and get er going again. When changing to a different gear size, take it to a reputable mechanic. If you don't get the clearances right, it won't last long, and you could damage everything in the rear end beyond repair.....I recently exploded a new Auburn Locker, not because of the gear settings, but point is, it wasn't cheap to get another new Auburn gear set, it ruined the ring, pinion and whole locker....
Oh and seriously, it's going to take a while to change gear size in any rearend. The 9 inch is popular because you can have an extra third member on hold incase the one in the car/truck explodes, you can do the swap and get er going again. When changing to a different gear size, take it to a reputable mechanic. If you don't get the clearances right, it won't last long, and you could damage everything in the rear end beyond repair.....I recently exploded a new Auburn Locker, not because of the gear settings, but point is, it wasn't cheap to get another new Auburn gear set, it ruined the ring, pinion and whole locker....
Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
the '79 and older lincoln town cars came with 2.7x ratio and 3.00 for towing
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
I think I have what is a simple enough question...I could find out on my own but don't have the truck with me right now. I have a 77 250 4by with a 400 and came from the factory with a D60 up front and rear and 4.10's, what spline do you figure it has? I can't believe I've never checked. I figure 31 spline is probably about as good as it gets, ford probably didn't do 35 from the factory right?
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
I wondered the very same thing when i read your earlier post, most highboy's came with the HD44 up front but since yours was ordered with a D60 you may very well have a 35 spline count axle, if it's a high pinion D60 i can almost guarantee you it's 35 spline, if it's a low pinion D60 then most likely it's a 30 spline.