CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Another 14bff question.

77_Jimmy

1/2 ton status
Joined
Oct 16, 2008
Posts
522
Reaction score
136
Location
Justin TX
Before I go buy it , I wanted to make sure. Will a 14bff from a 1978 3/4 ton 2wd bolt in to my 1977 K5 ?
 
Thanks , do I have to relocate the shock tabs? This axle is 5 miles from my house and is only $175. I have a 14bff from a 1 ton but I have to move pads and shock mounts. The kit that has new pads and mounts is $120 , then I have to find someone that will come to my house cut off the pads and mounts and weld on the new stuff. I don't have a welder nor do I know how to weld. All my friends thinks I nuts for liking old trucks , so they're no help. But I have enough jacks and cuss words to get stuff where I need to , it just has to be bolt on.
 
I beleive you have to get a different u joint for the pinion, and maybe some brake cable issues too. You could probably find a shock to work with those mounts, but they do hang a couple inches lower than the 4WD units.
And of course 8 lug rims.
 
The other stuff is no issue. I have a complete k30 sitting in my driveway. I don't have welding capabilities , so I'm looking for a housing I can bolt in. I can get the 2wd axle for less money than it will cost to pay someone to modify the 1 ton axle. So I take the pads on the 2wd axle don't need to be moved? I might be ok with learning how to weld shock mounts , but not pads. I found out after I bought the k30 that the rear axle would not bolt in. But the main reason I got the k30 was the d60 and sm465/205 combo.
 
For a direct swap of a 14ff into a 73-91 blazer it must be a 3/4 ton axle, for a direct swap of a 14ff into a 69-72 blazer (with exception of shock mounts) it must be a 1 ton axle.

Basically a 69-72 blazer has a 40.5" center to center on spring pads and 73-91 has a 42.5" center to center on spring pads. A 1/2 and 3/4 ton has 42.5" spacing and a 1 ton has 40.5" spacing.
 
And don't forget to change your U-bolts, unless you have some really good used ones.
 
1st it sounds like you need new friends lol.
2nd buy a welder and start learning how to weld.if you are going to mess with the old trucks and want to modify them you will want to learn how.it would only take a few things being welded to more than pay for a small 220v welder.
3rd buy a small set of torches and learn to use them.
 
For a direct swap of a 14ff into a 73-91 blazer it must be a 3/4 ton axle, for a direct swap of a 14ff into a 69-72 blazer (with exception of shock mounts) it must be a 1 ton axle.

Basically a 69-72 blazer has a 40.5" center to center on spring pads and 73-91 has a 42.5" center to center on spring pads. A 1/2 and 3/4 ton has 42.5" spacing and a 1 ton has 40.5" spacing.

The axle I am asking about if it will bolt in is a 3/4 axle. However it's from a 2wd truck. Based on the replies I gather it will bolt in , but I have to change shock mounts. Correct?
 
The axle I am asking about if it will bolt in is a 3/4 axle. However it's from a 2wd truck. Based on the replies I gather it will bolt in , but I have to change shock mounts. Correct?

As was already mentioned the shock mounts on a 2wd axle hang lower than a 4wd axle. Depending on your pinion angle will determine if you can use the stock mounts as is. I installed a 2wd axle in my blazer and because of the pinion angle the driver side shock body would hit the mount not allowing the shock to bolt in. The passenger side was good. What i did for the mean time was to cut a "V" out of the shock bracket and then bend the mount together and weld it together. This moved the shock body to a position that would now clear the bracket. Eventually i cut the shock mounts off and when i welded new spring pads on to eliminate spring shims i also welded on a set of 4wd shock brackets.
 
As was already mentioned the shock mounts on a 2wd axle hang lower than a 4wd axle. Depending on your pinion angle will determine if you can use the stock mounts as is. I installed a 2wd axle in my blazer and because of the pinion angle the driver side shock body would hit the mount not allowing the shock to bolt in. The passenger side was good. What i did for the mean time was to cut a "V" out of the shock bracket and then bend the mount together and weld it together. This moved the shock body to a position that would now clear the bracket. Eventually i cut the shock mounts off and when i welded new spring pads on to eliminate spring shims i also welded on a set of 4wd shock brackets.

OK thanks , thats what I was looking for. Will this work?
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=94164
 
The axle I am asking about if it will bolt in is a 3/4 axle. However it's from a 2wd truck. Based on the replies I gather it will bolt in , but I have to change shock mounts. Correct?

If yo have a 4.5" grinder and several disks you can get the shock mounts off in several minutes. IIRC, they are only welded on to the tubes with three little welds and it is easy to get a cutoff wheel in and cut the weld and use a BFH to hit it off the rest of the way. My 14 bolt was a 2wd too and was easy to deal with.

Learning to weld is a great thing as said above.
 

Latest Posts

Top Bottom