Drive shaft slip Yolk weirdness.

[MikeStang 247]

Okay got my new driveshaft in and went to slip it in and it stops just past the output seal WTH.

I told them a C4 Yolk which should be same as a 4R70W.

Well seems the actual 4R70W yolk is 1.6" and a C4 Yolk is 1.5" outside diameter... So knowing I have a 4R70W because that's what my computer is operating why the hell does a 4R70W yolk that's 1.6" not fit but a C4 yolk that's 1.5" in Dia does?? What gives.

It measures same ID on both yolks but the actual 4R70W yolk they sent is to big on the od

[GypsyR 32]

Possibly because there are two different sizes of tailhousing bushings for 4R70W's.  A 1992 (technically an AODE) used a 1.506" tail bushing. And matching seal. From 1993 on up the AODEs', 4R70W's, and all supposedly used a 1.606" inside diameter bushing. It's possible to swap the entire tailhousing and not notice until you have a yoke mismatch. Pretty sure you can't swap just the bushings, nor the seals either.

[MikeStang 247]

Yeah I did some research on it last night and it would seem I can swap the entire tailshaft housing out to a later model and get the larger diameter bushing and be able to use my new Yolk.

However I really didn't want to swap my damn tail shaft housing out LOL...

If I just swap my old yolk on to my new driveshaft will I need to have it rebalanced?

The damn 4R70W yolk cost me 98 bucks :-/ 

It may be easier to just get a 4r70 tailshaft rather than sending this shaft back etc....