I am trying to find the length of the rear drive shaft for a 1988 F150 4x4 with a M5R2 tranny. I am in the process of swapping the M5R2 into my 86 F150 but am wanting to know if my rear shaft is the same length? Could anyon measue theres for me or tell me if mine will work. I've currently got a 4sp-od tranny right now with a np208 transfercase. Any help appreciated. Thanks!