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Author Topic:   Ford 9in. Drop Out
Modified 49T
Dirt Newbie

Total posts: 2
posted April 18, 2001 06:18 PM
Can anyone tell me what kind make and year of car or truck came with a ford nine inch drop out that was a 31 spline. I have opened up a 28 spline drop out so the axels will fit, but would like to get a stock drop out, put my gears in and go. Thanks.

awkwardjeff
Dirt Freak

Total posts: 218
posted April 19, 2001 09:00 AM
I'm not sure of years and models.........I don't look for anything special, take a 1- 3/8 drill bit to drill out the centers of the spool where the axles slide in.....if you don't have a bit that big or a drill press, just use a die-grinder.......and make sure the axles fit before you start assembly.
When I go hunting for cores I look for the proper yoke.........that's what is important to me.
I assume you will be putting a mini-spool in this set of gears? You may also need to grind the inside of the case to clear the ring gear..........where it contacts the pinion.........so to do this job you will need a die-grinder anyway.
just a few thoughts, Jeff

tls88mod
Dirt Roller

Total posts: 24
posted April 20, 2001 10:30 PM
Here's a suggestion, buy a 31 spline full spool for a $150.00. You will save a lot of time not hunting for stock 31 spline and you will save rotating weight also.

PEDDLER
Dirt Maniac

Total posts: 148
posted April 21, 2001 07:13 AM
If my memory serves, any chunk from 72 up is a 31 spline. I will check this morning when I go to work and post later this afternoon.

The Peddler

------------------
RACING IS A HOBBY
GO HAVE FUN

PEDDLER
Dirt Maniac

Total posts: 148
posted April 21, 2001 03:36 PM
I wascorrect for once. The 72 year model was a split production year in both cars and trucks. One would be safe (excluding a rearend swap) that a 73 up both car and truck would be a 31 spline chunk.

I hope this helps.
The Peddler.

------------------
RACING IS A HOBBY
GO HAVE FUN

hanksnow
Dirt Newbie

Total posts: 3
posted April 21, 2001 04:21 PM
**************************************************Now to answer the mans question is ford made mostly 28 spline axles if you are looking for one try mid-70's 4x4 or hi-pro street cars
but try mini-spools or a full spool cause after you play the pumpkin game then you will play the spare axle game

[This message has been edited by jammin (edited April 21, 2001).]

PEDDLER
Dirt Maniac

Total posts: 148
posted April 22, 2001 08:37 AM
Well I was just trying to answer a question. It appears as though some don't want an answer. THEY MUST KNOW IT ALL!!!

I really don't kow all that much about Mods, But was only trying to help out.

Don't worry,,,it won't happen again.

The Peddler

awkwardjeff
Dirt Freak

Total posts: 218
posted April 22, 2001 09:05 AM
PEDDLER, don't let some else's thoughts and comments bother you.........You know that you answered the first mans question. It was very specific in the information he was looking for..........I did make a comment about the yokes too........just incase the person hadn't thought of that.......Hanksnow had another valid point of axle legnth, although he didn't need to bash anyone to get that point out there.
If the original question would have given a little more information we wouldn't have to guess as to it's use and the information we give would be better........
I just would like to say that Hanksnow is the NEWBE here, And I for one have like and used your thoughts and addvice in the past.
Please don't be offended by what ONE peson had to say. Some times it's hard and lonely being right..........Jeff

jammin
Dirt Administrator

Total posts: 3279
posted April 22, 2001 09:52 AM UIN: 16262997
Guys.....I want everyone here to feel like they can add input to anyone's question. If you have a problem with someone bashing....PLEASE, let me know, I will handle the situation. I do the best that I can to read each and every post on here, but on occasions, I do miss some. I need your help in keeping the forum the way it should be. So, keep posting and we will continue take care of any situations that arise. An email was sent yesterday about this situation. Thanks for your participation here, it is appreciated by everyone.

jammin

MOD RACER#93
Dirt Freak

Total posts: 251
posted April 22, 2001 02:44 PM
you will find that most car's have 28 spline. regardless of the year. "some" maybe hi perf or cop car versions "might" have 31 spline. if you really want a true 31 spline 3rd member your best bet is to look at 80 or newer ford truck's with 9" rear. most have 31 spline. 79 down had both 28 and 31. to comment on the one post.. most 4X4 chuncks are low geard and usually wore out so bad by the time they get to the salvage yard that they arent worth messing with. the 80s 2X4 models will have hi gears and usually be in really good shape bearing wise. the yoke may be different on a truck but it can be swapped from a car. i have done this many times. hope this helps.......

Pigpen
Dirt Roller

Total posts: 17
posted April 25, 2001 05:35 AM
I TRIED DRILLING OUT THE CARRIER TO 1 3/8 AS WAS SUGGESTED HERE, ONLY MADE 2 NIGHTS AND THE WHOLE CARRIER BROKE LOOSE. I SUGGEST JUST SPENDING THE MONEY ON A FULL SPOOL....

awkwardjeff
Dirt Freak

Total posts: 218
posted April 25, 2001 08:45 AM
Pigpen, I was the person who said to drill the carrier out to 1 3/8.......what broke on your rear end? I will tell you now, what ever broke had nothing to do with drilling the carrier. I set up about 20 sets of gears every year. I have a set of 650 with 40 shows that look like new, a set of 567 with around 80 shows that are in great shape.
I myself like to use a full spool also, but for a person looking to get by the cheapest way drilling is the way to go. The stock spool is the same from the 28 spline to the 31 spline other than the hole for the axle being 1 3/8........when useing the small bearing.......if you get a carrier with the big bearing there is a little more metal where you drill. You drilling this had nothing to do with any breakage problem.....
I would say who ever set the gears up for you used a crush collor, not a steel sleeve with shims.......this person didn't crush the collor correct, resulting in the torque of the motor crushing the collor too much, leaving the pinion bearing running loose. Then the ring gear rides up the pinion, resulting in breaking a cap that holds the carrier in place.......
If you did these yourself, I'm sorry. I didn't rip on you. I know people that pay someone else to set their gears up because they don't feel they know enough......then when they break them after a few nights they get mad........gears are expensive.......I can tell you I have NEVER had a customer mad at me over a set of gears. If there is a problem I will show them the problem. I'm not perfect. When I started out doing my own gears I lost one set........the carrier was bent, I didn't check it.......MY FAULT. I have never lost a set of gears since then. Mine or someone else.......I had one customer say I messed up.......he hit the wall a ton on the last lap of the heat race.
After replacing the trailing arms and the wheels and fixing the other stuff he went out in the feature and broke the gears in three laps.........This gear set was on it's 6th night........who's fault?? MINE???
Anyway, when you drill the carrier you only enlarge the hole to what a stock one is for a 31 spline.........that's my point. It had NOTHING to do with your problem.
If you use a crush collor, you can't change yokes either......if you do you need to take them apart and replace the crush collor.
The steel sleeve is the way to go, it takes a little more time during set-up, and a little more work......but in the long run is a better deal..........if you throw the drive shaft out of your car, chances are good it will bang on the yoke before exiting the car.......this will crush a collor too much again and cause more work to replace. If you don't replace the crush collor you will have another DNF because you will loose the gears next night out.......again this is why I like to use the steel sleeve with shims.

sorry this is sooo long.....there is a bunch more we could put in here, but I just needed to get my point out there......drilling the hole wasn't the problem......you need to look at why these gears failed so it doesn''t happen again.

Goldigger
Dirt Full Roller

Total posts: 26
posted April 25, 2001 03:17 PM
[QUOTE]Originally posted by MOD RACER#93
My experience mostly has lyed with the Lincoln Mark 5 disk brake rears, I think they are all 31 spline. But most are considered too wide for dirt application. There are some narrower rears in Ford trucks but they don't have the 9" pumpking they are 9 and 1/4 so, use that housing and 9" pumpkin for a good resource if desired.

owracer
Dirt Maniac

Total posts: 103
posted April 25, 2001 04:12 PM
I think you maybe slightly wrong here Jeff. A 28 spline carrier from a passenger car is smaller. If you where to drill this out the way that you say it would leave the area between the axle opening and the bearing thin.
I just rebuilt a unit for a customer a couple of weeks ago and ran into this. The bearings for the 28 spline carrier where to small for the 31 spline.

awkwardjeff
Dirt Freak

Total posts: 218
posted April 26, 2001 01:35 AM
Not to argue with anyone........they come with 2 different size bearings.....the small bearing is either 28 or 31 spline......the big bearing only comes 31 spline.
I have drill out the carrier on 20 sets that I have put together, I have NEVER had a problem in this area. I know countless people that have done this for years also, with the same results............
Do they get thinner when you drill them? yes
Does this create a problem? no
Find yourself a stock 3rd member with a 31 spline and small bearing, you will see what I'm saying..........Ford made them this way.
Do you believe this person broke the carrier because it was drilled too thin?
I believe Ford had problems with them after a while THEN went to the big bearings so there would be enough room in the center for the big axles............To me if you broke a carrier that was drilled out you must have had something banging around inside the rear end to cause a failure like discribed....that's all I'm saying, there is more to this story, and this person should be looking for some thing else as far as failure goes.....
Jeff

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