dizwiz24

Curious if the slip yoke/ drive shaft is any different for a black lavel vs. blue label zf6.

I heard once that the throwout bearing and possibly the pilot bearing/bushing is different between the two.

What about the output shaft?

WIll it take the same slip yoke/ driveshaft?

sailorsteve

Don't know, but you could try looking up the part numbers for early and late ZF6's and see if they are the same.

cadmaniac

I know the clutch and T.B are different if you are thinking of swapping units out. I think the shaft out of the front of the trans is bigger on the black labeled ones.

If you start checking part numbers out, I think you'll see they are different.

johnnymo63

The drive-shafts are the same. Early vs late might be different. (4+3 vs ZF6)

The input-shaft is different, (This is the shaft that goes through the clutch, pressure plate and flywheel) . The black tag is a bigger diameter.

The drive-shaft for the ZF6s are 1" shorter than for an automatic. Also, all of the u-joints are the same through-out the entire drive-line. (Drive-shafts & axle-shafts)

The C-channel is different from auto vs manual. The front mounting holes are about 15/16 off. You can drill new holes to make an auto work when switching to a 6 speed, but not visa-versa. (Need to search for the mod. I don't have a link)

bjm206

They are the same...32 spline on 35 mm dia. shaft using 1310 u joints.

The Dana/Spicer part number for the yoke is 2-3-13131x for all ZF6 transmissions in C4s. Last time I looked it was out of production.

vetteoz

IIRC from past posts 32 spline TH400 yoke is the same

4+3 has same 27 spline yoke as T700/4L60E

DVNCI

Think that's correct when I did my solid rear I of course had to use a new driveshaft and so I needed a new yoke to support the 1350 u joint.

Only problem we had was the cast yoke would leak badly - a billet yoke solved the problem (even though the calipers showed the same diameter . . . . . weird)

WVZR-1

A ZF is a 35mm output and the TH400 "IS NOT"! Is it (TH400) a "FIT"? NO!!

A new TH400 slip-yoke on a ZF output intoduces something compared to maybe 100K of use! It will likely vibrate and certainly isn't likely to do the output of the ZF any good! A 60K ZF and a TH400 slip-yoke maybe wear equivalent to 200K. It would likely, my opinion, beat "He!!" out of the bushing. It just "ain't right"!!

There are drive-line shops that aren't that familiar with the different output shaft diameters and to them a 32 spline, actually (31 based on 32) if it's in a GM it's a fit. A TH400 and most HD transfer case output shafts are the same 32 spline.

I believe I'd rather have a ZF slip-yoke "hard chrome plated" for a quality repair!

WVZR-1

not!!!

Your reference to the 2-3-13131X is correct for the ZF and yes it's hard to come by!

ZF - 35mm = 1.37795 (advertised 1.378)

TH400 - 35.4838 = 1.397

You might/maybe "can do" a 35mm and a conversion u-joint 1350/1310 or I believe maybe even a 3R/1310 but it needs to be shortened. It would also need to have a yoke that is similar to the original. I haven't had either of these in my hands but I do believe it's likely "doable"!

Hard Chrome is the fix - I believe!

WVZR-1

Damn! I forgot to answer your question!

A ZF slip-yoke is a ZF slip-yoke. All years '89 through end of production!!

rodj

I stand corrected ,Dave.

Are yokes case hardened?
Given the availability of the genuine ZF6 yoke ,
could you not turn/polish the TH400 yoke down to the correct dimension?

WVZR-1

The dimension I've mentioned is "major internal diameter" on the slip-yoke. The external diameter is the same 1.885. Generally the OD of the slip-yoke is what needs attention and a "hard chrome" finish I would think could accomplish the "fix"!