14 bolt semi float ques.

[jacksprat1599]

Hey everyone,I am in a bind.My 10 bolt died and I need to get my truck running soon.I can get a 14 blt SFF but I need to know If I can use 10 bolt spring plates and U-bolts to hang it,also will my brake lines bolt up to its brakes.I will have to use my hard line off of my old 10 bolt as the 14 bolts is missing.One more thing ,will my drive shaft and u-joint bolt to the 14 bolts pinion yoke. Thanks a lot.

 

[79Jimmy]

Spring plates and u-bolts will not work. The 14sf axle tube diameter is larger than the 10b. You could drill or hog out the plate holes but why bother just get a pair from any 3/4 or 1 ton 14sf or 14ff, it doesn't matter. U-bolts should be replaced anyway as they are the wrong size and are easier to cut off anyway /forums/images/graemlins/grin.gif The tubes are 3 3/8" IIRC. The u-joint will also not work however a convertion joint is available at your local auto parts store. Brakes should be a bolt on afair /forums/images/graemlins/grin.gif

James

 

[jacksprat1599]

so you are saying that the axle tube dia. is the same as on the 14ff?Is the conversion u joint the same for both 14sf $ 14ff.

 

[79Jimmy]

Yep, same diameter. Convertion joint should be a 1/2 ton(1310?) to a 1350. My 14sf uses a 1350 joint but I never used a convertion joint. When I broke my driveshaft I upgraded it and put a 1350 yoke on the end of my transfer case (205).
James

 

[88K5Jimmy]

I swapped in an 82 14bsf into my 88 Jimmy. You will have to get new u-bolts and spring plates. I even used my hard brakelines off my 10bolt on the 14bsf. There is also a conversion u-joint as mentioned. I can't remember the part number but if all else fails you can measure u-joint cap sizes.

 

[stallion85]

Copied from the part numbers thread in the tech articles forum

"The Napa PN 348 is a 1310-1350 combo joint used when going from 12 bolt to 14 bolt."

Should be the same for a 10 bolt since it also has the 1310 series u joint.

 

[83ZZ502_Jimmy]

[ QUOTE ]
Copied from the part numbers thread in the tech articles forum

"The Napa PN 348 is a 1310-1350 combo joint used when going from 12 bolt to 14 bolt."

Should be the same for a 10 bolt since it also has the 1310 series u joint.

[/ QUOTE ]

That would be correct if he had a 1310 in his truck. His truck is a S44 to 1350 joint requiring a neapco PN 2-1153 or cross ref'd to NAPA 447.

John

 

[jacksprat1599]

Thanks for all the help guys.The 14 is in and that napa 447 part # was right on.

 

[Rolled]

Are you running a 6 lug 14sf or are you swapping to 8 lug rims too? If you are running a stock 14sf 6 lug, I think the spring perches need to be relocated...


I seem to remember reading about using 6 lug axles from a stock 14sf and putting them in the 8 lug version that is a direct swap for our trucks.


It would be better to just swap to 8 lug in the front and back but one of these days, I am going to get a 6 lug 14 bolt for the K5...

 

[jacksprat1599]

It is a 6 lug 14 bolt and the perches were moved by the po but they are not right my u-joint angles are not equal and it vibrates pretty bad at 25&50 mph.I just started another thread on how to measure u-joint angles because I am not sure I am doing it right.