14bff swap

[AKbigsub]

Does anyone know if I will need to lengthen my rear drive shaft when I install the 14BFF? It is a 90 3/4 ton burb with a semi floater and 4 inch lift. I have already confirmed that the u-joint is the same but am concerned about the d-shaft length.

 

[JIMs70K25]

I asked this same question for my 89 3/4 ton burb and the answer was, no.

 

[u2slow]

I swapped from a 14bSF to a 14bFF in my C20 Burb - no driveshaft mods. I think the slip-joint on the driveshaft extended about 3/8".