Hey I am looking at a 1984 F150. Its already got an 8 inch lift on it and 39 inch tires. It looks well built and it look like the rear was replaced with a 9 inch rear. The front is a TTB I assume the stock F150 TTB.

Is it safe to run 39 inch tires on a stock F150 TTB axel with breaking it ?

Was there a bigger TTB axel then the stock F150 ? What axel did the F250 and F350s have from the same years ?

 

With 39's and a stock TTB axle, if you plan on doing any heavy 4 wheelin', make sure you have a friend with a good strong truck that can tow you off the trail, 'cause it's gonna break!

IIRC, the stock axle could handle a 33" tire with no problem, but 8" of lift and 33's would look dumb. An F-250HD-350 from tthe same year had a Dana 50 front axle while the regular duty F-250's had a Dana 44HD. Either one is still not really up to handle 39's on a hard driven 4x4. If you wanted to, you could swap in a straight axle from a 70's Ford. The guy's in the Offroading section know all about this and they have a few threads on how to do it.

 

I don't really want to swap out axels. The guys said "both axels were done" buy the pervious owner(the guy who had it before the guy I might buy it from). I assumed it was an 9 inch in the rear but I maybe it was the rear in the F350 which i think was a 10.25 or dana 60. I wonder if he swapped out the front axel also from a F230/350. Is that even possible could he have put the F350 D50 TTB in it ?

What size tires you think the D44HD or D50 TTB axels can hold ?

 

If the rear is a 9", it can handle 39's. A rear 10.25 can handle up to 44's because of the full floating design of the axle's. However, I wouldn't put anything bigger than 35's on the stock Dana 50 or Dana 44HD front, and even then I'd take it easy for fear of breaking it. That's the difference between IFS and a straight axle. The straight axle is better for bigger tires because it has less moving/pivoting parts to go wrong.

If the P.O say's he went through them, see if you can take them apart to verify if he did it. If he say's no, be careful because he might not have done the work and he's just trying to B.S you.

 

He said the P.O did the work and he is not sure what all he did. He seems like an honest person. He just doesn't know what all has been done. If I took a picture of the front TTB do you think you guys would beable to tell if it was the D44 or D50 or what ? Same for the rear.

 

The trucks that had Dana 50's had leaf springs in the front, same with the Dana 44HD. If the front has coil spring pockets, it's a regular Dana 44. A picture of the rear would help if you've got one, but as a general reference, if it has a drain plug with a removable cover it's a Dana 60. If it has a removable cover and no drain plug, it's an 8.8" rear end and if it has a smooth rear cover with a center section that can be unbolted, it's a 9" rear.

 

TTB with Leaf springs ? Never heard of that. I wonder if you could convert it to coils. It sounds like the rear is a D60. I will have pics up soon.

 

Pics
Rear
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0001.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0002.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0003.jpg
Front
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0004.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0005.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0006.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0007.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0008.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0009.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0011.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0012.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0013.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0014.jpg
http://i11.photobucket.com/albums/a164/Fillmore4/DSC_0015.jpg

 

The rear is indeed a Dana 60. The front is a Dana 44. And if you look at a 3/4 ton, you'll see a TTB front axle with leaves. Those setups rides ok, but I'm going to swap in a straight axle in mine because I want uber strength.

 

got any good links on info on doin the straight axel swap

Do you have a pic of a D50 TTB ? Are are you 100% sure thats a D44. Just doesn't make any sense why a person would spend all the money to swap in a D60 in the rear and not do anything to the front.

 

I'll post some pics of my F-250 and show you the Dana 50 it has. The Dana 44 and Dana 50 look exactly the same but with coil spring pockets like those, you do have a Dana 44. I *think* there were some light duty Dana 60 rears. If the rear has 8 lugs, it's out of a 3/4 ton and if it has 5 lugs, it's a light duty rear.

If you have any doubts aboot this truck, you should pass. I've seen some pretty wierd stuff from people who just put stuff into a truck just because it's lying around and they don't want to spend too much money fixing it right. Just remember Robert DeNiro in Ronin: "When in doubt, there is NO doubt".
If you go to the Offroading section, those guy's there know thier stuff and they have quite a few threads on doing the straight axle swap.

 

Do you think the stock D44 TTB can handle the 39's for street use ? I am thinking about maybe buy it anyway. I have pointed out to the owner that the stock D44 is far to weak for those tires. I think he might seriously drop the price.

then later down the road i would like to do a D60 SAS on it.