14bsf to 14bff driveshaft ? **NEW u-bolt ?**

[JIMs70K25]

Going to purchase a 14BFF to replace the 14BSF in my burb, How much shorter will my driveshaft need to be? or How much lift should I go with to use the stock driveshaft?

I'm going to get the 14BFF this weekend, next question and I beleive I know the answer, Will my u-bolts/plate work? I believe it will not and I'll need new u-bolts and spring plates. confirm this please.

 

[mechted]

IIRC, it might be something on the order of 1-2" or so shorter for the 14bff

 

[ratzila]

When I went to the 14ff from the 14sf I used the same driveshaft with no mods. They have the same 1350 yokes

 

[smokkey1]

When I went to the 14ff from the 14sf I used the same driveshaft with no mods. They have the same 1350 yokes

same here.

 

[JIMs70K25]

I thought the pinion stuck out further on the ff. Oh well, one less thing to worry about.

 

[dyeager535]

Pinion yoke is about 1" further forward on the 14SF than 10 bolt, sounds like the 14FF and SF are about the same in that regard, makes sense.

 

[JIMs70K25]

TTT for new question in original post. Thanks!

 

[mechted]

axle tube diameter is 3-3/8" on a FF, but you should get new ubolts regardless, once they have been torqued, they will not hold again, and can loosen up over time

 

[dyeager535]

Yes the u-bolts will work, same tube diameter.

I've re-used the u-bolts for the couple of axles I've installed in my truck, whenever I'm doing maintenance those are one of the things I check, they've never loosened up on me. I made sure to keep the factory nuts and washer that is installed, they seem to have a different color about them for some reason...

 

[JIMs70K25]

Thanks!