Which of these are the correct part number for our C4 Vettes??

* Spicer #5-799X

* Spicer #1350 non-greasable

Should I use these or have you guys found a better U-joint than the Spicer?

 

The correct Spicer part # by application is 5-447X, which comes with grease fittings and has bearing caps coated to prevent corrosion.

The 5-799X joint will fit, but has no grease fitting and the bearing caps aren't coated to prevent galvanic corrosion with your half-shaft.

Part #5-800X is the heavy duty joint with no grease fittings and has coated bearing caps for use in an aluminum half-shaft.

1350 is just the driveshaft series and not a u-joint part #.

--edit, there are also a few differences with the type of seals each of those part #'s use as well. But they don't affect fitment.

 

Thanks for the information. As best as I can discern, the 5-800X has been discontinued and is replaced by Spicer 5-799X. Is there a non-greasable Spicer replacement with coated end caps?

 

pmihaltian, I just checked my Spicer catalogs and everything I posted above is correct - according to the catalogs. Spicer doesn't list the 5-800X u-joint as being discontinued or superceded. It also doesn't show the 5-799x as having coated caps for use in an aluminum drive shaft.

With that said, some other supplier's catalogs list the 5-800x as obsolete. I'm going to call someone at Spicer next week just for my own info and see if I can find out what the deal is.

 

Half shaft or driveshaft or both?

 

If you're looking for strength I'd go for the heavy duty ones w/out zerks

 

Thanks, Red. Any help or clarification that you can give me on the proper coated half-shaft u-joints will be most appreciated.

 

Good luck finding the 800X.

 

Half-shaft u-joints

 

Yea, that's my plan. I just need to figure out which Spicer # is the correct heavy duty one w/out zerks. I'd also like to get the u-joints with the proper coated bearing caps.

 

Stole this from another forum thread.

The preferred Spicer u-joints are the

5-786X for aluminum driveshaft (1310 series)
5-800X for aluminum half shafts (1350 series)

However, these parts seem increasingly difficult to source. The numbers appear
listed as 'Unknown' on the Dana/Spicer website compared to other numbers that
display as either 'Active' or 'Discontinued'. I wrote to Dana/Spicer to ask about
the status of these parts but I have yet to receive a reply.

It appears that Spicer vendors are telling buyers to accept u-joints intended for
steel drive and half-shafts (apparently without explaining the differences
or possible consequences)

5-785X for steel driveshaft (1310 series)
5-799X for steel half shafts (1350 series)

As an alternative to Spicer u-joints, there are the following

ACDelco

ACDELCO Part # 45U0405 {#89049306}
JOINT KIT,PROP SHF FRT/RR UNIVERSAL -; OPTIONAL ANTI-GALVANIC U-JOINT FOR USE IN
ALUMINUM YOKES; PREMIUM; DIAGRAM I, POSITION 1 & 2 - REFERENCED IN PAPER CATALOG

ACDELCO Part # 45U0400 {#89049301}
JOINT,RR WHL DRV SHF INR/OTR UNIVERSAL -; LEFT/RIGHT HAND; OPTIONAL ANTI-GALVANIC
U-JOINT FOR USE IN ALUMINUM YOKES; PREMIUM; DIAGRAM I, POSITIONS 3 to 6 - REFERENCED
IN PAPER CATALOG



Neapco

NEAPCO ("Brute Force with AlumiGuard")

Corrosion-Resistant High-Performance U-Joints for Aluminum Driveshafts
Neapco # (Premium) Description
1-0626BF: 1310 Aluminum U-Joint (Driveshaft)
2-0617BF: 1350 Aluminum U-Joint (Half-shaft)

Neapco also offers standard performance u-joints for aluminum shafts
1-0153BF: 1310 Aluminum U-Joint (Driveshaft)
2-0053BF: 1350 Aluminum U-Joint (Half-shaft)

Rockford Driveline is a third source

Rockford Driveline

There appears to be two versions of the coated driveshaft and
half-shaft u-joints. I have no information beyond part numbers.

Rockford # Description
K153A & K467A: 1310 Aluminum U-Joint (Driveshaft)
K178A & K447A: 1350 Aluminum U-Joint (Half-shaft)

 

Ok, here's the deal on the different u-joint #'s. The part #'s I've posted above are correct. The 5-800x is the correct part #, but it has been discontinued. I can say with good certainty, it was discontinued to reduce or consolidate part #s -- not because a coated cap isn't needed.

Regarding the strength & grease fitting issue: The 799/800 u-joints are stronger than the 5-447x because the 799/800 trunions use cold formed steel (not because it has a grease fitting). The trunion on the 5-447x is heat treated. Also, the solid u-joints are not drilled all the way through the trunion as I guessed in an earlier post.

So, unless you can find old stock of the 5-800x, you'll have to use the 5-799X if you want a solid joint (which does not have coated caps to prevent galvanic corrosion). There are still many other reason I'd personally go with Spicer over other brands, but, another time....

 

 

Hmm, what if the u joint does not have coated caps to prevent galvanic corrosion, what happens?

 

Nothing. It will take years, and I mean years to have any type of issues.
I had my non coated ones in the Vette since 2002 era, and just replaced them. No issues, no corrosion.
But scientifically it can. Put some oil on it, anti seize.. Its not going anywhere with the locks..

 

Great thanks!!