i have had this assumption since last year when i had a pair of driveshafts laying next to each other, and one was 3/4" longer than the other. my assumptions were proven true last week when i installed my extended rear control arms, and my new aluminum driveshaft.
the shaft that was 3/4" longer than my SS one was.......
from my 99 P71 crown vic. so i finally found something that ford was good at besides sounding fast while being slow, and rusting out and needing scrapped at 76k miles.
i looked up both shafts and found the vic to use the 1330 universal and the SS to use the saginaw 44. then i looked up a conversion universal to go from one to the other so i could install my trans yoke to the driveshaft and the shaft to the pinion yoke. once i found it, i cross referenced it to a vehicle application so i could get it locally, and found that the joint one needs to ask for (you need 2 to do this) is the rear joint for a 2wd 2003 avalanche. you will know at the store you have the correct joint because it has 2 different styles of caps and retainer clips. one pair of clips is internal that goes in the groove in the cap, the other is external and goes into a groove in the yoke of the driveshaft.
precision part #355
masterpro(oreilly) #355
duralast #2-1569DG or 2-1569DL
neapco #2-1569
brute force #2-0621BF
i have driven it for a week and like have no vibrations or anything weird. and i drive my car hard and have considerably more power than a stock LT1. the p71 aluminum driveshafts are very well balanced from the factory. i know 98-02 will work, not sure about the 03+ because they changed the entire chassis that year.
remember this only works if you have extended rear control arms.
the shaft that was 3/4" longer than my SS one was.......
from my 99 P71 crown vic. so i finally found something that ford was good at besides sounding fast while being slow, and rusting out and needing scrapped at 76k miles.
i looked up both shafts and found the vic to use the 1330 universal and the SS to use the saginaw 44. then i looked up a conversion universal to go from one to the other so i could install my trans yoke to the driveshaft and the shaft to the pinion yoke. once i found it, i cross referenced it to a vehicle application so i could get it locally, and found that the joint one needs to ask for (you need 2 to do this) is the rear joint for a 2wd 2003 avalanche. you will know at the store you have the correct joint because it has 2 different styles of caps and retainer clips. one pair of clips is internal that goes in the groove in the cap, the other is external and goes into a groove in the yoke of the driveshaft.
precision part #355
masterpro(oreilly) #355
duralast #2-1569DG or 2-1569DL
neapco #2-1569
brute force #2-0621BF
i have driven it for a week and like have no vibrations or anything weird. and i drive my car hard and have considerably more power than a stock LT1. the p71 aluminum driveshafts are very well balanced from the factory. i know 98-02 will work, not sure about the 03+ because they changed the entire chassis that year.
remember this only works if you have extended rear control arms.