9 inch in 79 CJ-5

Anyone out there ever tryed putting a 9 inch out of a early Bronco into a 79 CJ-5.If so what complications will I be faced with.

 

What year EB. If its a small bearing 28spline its decently storng but not nearly as strong as what people talk about 9" being. Esp. behind that corvette engine you got in that thing

 

I,m still looking for one,But I wanted to find out if it would work before I wasted any more time effort and money in this project.From the information you gentlemen have given me it is going to be as easy as I thought it was going to be.

 

It will be wider and with the low pinion, won't it give steep driveshaft angles in a 5???

 

I plan on changing the pinion angle,because I have to cut the spring perches off anyway. I will set the pinion angle to 15 or 20 degrees.Does anyone know if you can get a u-joint to go from Jeep to Ford?

 

If you are going to buy a new shaft anyhow, get one with a CV then point the rear end at the transfer case. Best way to do it, and they can set you up with anything you need.

Otherwise the pinion angle MUST be the same as the transfer case or the driveshaft will be out of phase.

It is a pretty simple swap, but will require some welding and hooking up the brakes, then flushing, and possibly e-brake depending on what you are using.

 

I don't know if you'd consider these as complications, but the Ford pinion is lower than a Dana, so your driveshaft angle problems will be worse than with, say, a Wagoneer 44. Also, the Ford in stock form isn't really an upgrade to the flanged 44, so you won't gain any strength by swapping. Seems to me like a lot of work for no gain. Up to you though.

 

The Ford's ring and pinion stock is twice as strong as a Dana 44 and stronger than a Dana 60 too. If they are 31 spline axles they are every bit as strong as a Dana 60 semi-floater. The housings sure seem to bend a whole lot less too.

 

Just to let you know, if you are gonna do the swap, any FLAPS should have or should be able to get a u-joint that'll work, you just gotta figure out what sizes you need. I know alot of folks having to run 1310 to 1350 joints, and they offer all the other configurations too. However, if you are gonna have to build a new driveshaft you could just build it according to what you have, i.e. Jeep on the t-case end/Ford on the pinion end. The 9" Ford would be plenty strong enough for ya.

Just my .02

 

I already have a CV at the top of the shaft.I,m running a AMC 20 It will be a great gain in strength.The rear has 31 spline axles and big bearings.

 

Well, that's not what I understood, but I'm not an expert. Someone who was selling a beefed-up 9" Ford rear end commercially came over to the IFSJA forum and tried to pitch their product to the members. Started a big pi**ing match, so maybe that's not a good place to go.

If you're interested, I'll look for the post, but it's probably expired.

However, they are both modern 1/2 ton axles and would expect them to be comparable in stock form. I certainly would not put a lot of money into one until I was sure of my facts, especially since it seems like a lot of the hype is centered around these 'enhanced' Ford rear ends. I'd certainly try to find some differing opinions.

 

If you find that post i'd like to see it.I've seen very few if any 9 inches to be broken with 31 spline axles,and never one with a broken 3rd member.Of course there are limitations to everything manmade.Anything that can be broken will be broken at the lease opportune time!

 

Nick I just lit a match :R

Cale broke 2 31 spline axels on that 79 he had. But I am talking about cale. If you bend a 9" tube with a jeep maybe its time to rethink the project R) R)

 

LIKE I SAID!Its Cale were talking about,hes the exeption to every rule!

 

The 9" is a great diff in the right application but not in a short wheel base Jeep. The pinion sits too low in a vehicle already suffering from driveline angle issues. The 9" ring and pinion is stronger than a 44, but not twice as strong. In stock form they use a crush sleeve to set pinion preload whereas the 44 uses solid shims. Crush sleeves have a tendency to relax under load and allow the pinion gear to walk around. I've seen them both fail as well as 30 spline 44 axles and 31 spline 9" axles in Jeep CJ applications. Anything can be broken. Can the 9" be beefed up to be as strong as a 60? Just about, but you have to spend a lot of money to do it. 9" housings bend just like 44, 30, Toyota, yadda yadda yadda. Seen it happen way too many times. If I were building a Street Rod, Circle track car, or something like that then the 9" would probably be my diff of choice. For a short wheel base CJ, no way, too many driveline issues. Just my opinion. Nickmil