U-joint help ASAP please!!!

[thefarmboy21]

A friend of mine just recently aquired a cobbled up mess of a Chevy. Long story short, he's been to every parts store in the tri state and personally inspected/mic'd their universal joint inventory......NONE are the same. Yesterday he went to 4 stores, all different companies and took all the googled part numbers for the 73-87's he could find so we need HELP!!! Here's what we know about it:
Cab/title is an 86 GMC 1/2 ton 2wd. Sitting on a 4x4 chassis of unknown origin. Has a 350/350 combo backed by the NP203 full time trasfer case. Has a Corp 14 full floater in the rear and I'm not sure if it has the 44 up front or the odd looking 10 bolt.

The U-joint we need mates the rear shaft to the 14-bolt rear. Also it's what most people call a "$#*() joint" Joint is narrower than tall and has two differen size bearing caps as well. Thanks in advance!

[SomeTexan]

Find a shop that builds axles or driveshafts. They should stock or be able to get the conversion u-joints. Bring them the shaft and the yoke.

[thefarmboy21]

Well I just would've thought it was a stock u joint for one ton or a half ton but we can't find it. Anyone know if there's a conversion joint for a half ton driveshaft to the corp 14?

[SomeTexan]

I know there is, just don't know a part # offhand. Find a spicer part number for both u-joints, then google the conversion u-joint part number. Or call a driveshaft shop and ask if they have them. Should be fairly common.

[thefarmboy21]

I found a site that has all of them.....waiting on the specs from him to cross it over.

[Irish_Alley]

see if these help,
these are common u joint conversions for gm. take the u-joint to NAPA and give them the numbers with the "X"
                      NAPA part numbers
1330 /1350 = 5-648X
1310 /1350 = 5-460X
1310 /1330 = 5-134X
the "X" is part of the part number so they need that also

[jesse79]

I think i know of the joint it is a 1350 on one end i cant rember the other but it is the same size as a 67-76 ford
We used them when putting 14 bolts in fords i will look i might have one one the shelf it was a spicer or nepco
Also call around to a drive line shop thats how i got mine and the guy sid it was a gm joint

[jesse79]

I looked in the shop ans no luck
If you need a part number let me know i can get it for you
In eather a spicer or nepco or a napa one
I have used all 3

[jesse79]

Did ya get figured out?

[thefarmboy21]

He thought he did, but I talked to him today after he tried it and still not right. I haven't been able to meet him to mic it myself.

[pholliday1]

They do make what they call a "conversion" ujoint I know napa has them and there have been some posts on them you can also try Randy's Ring and Pinion. I'm sorry but I don't know the parts numbers

[thefarmboy21]

He finally brought it to me and we mic'd it out....should be a 3-3140 series.

[skinu]

THEY CALL MINE A HYBRID JOINT AND I THINK ITSS A 377 FROM NAPA I LOOK AND POST,FIND WHERE AND HOW TO MEASURE YOKES TUBES ECT AND CHECK THAT SECTION IN THE BACK OF NAPAS UJ BOOK WAS WHERE I GOT MINE ,ALSO IF THERES TO MUCH DIFF CHANGE THE YOKE OUT ,WATCH FOR BINDING @ AT ALL SUSPENTION ANGLES ALSO,THEY DO MAKE MANY DIFFERANT HYBRIDS I DO KNOW THAT.

[thefarmboy21]

Yea, we got it....it was the 3-3140. He got two from Autozone. I can't remeber what Napa's part number was. We did learn that he has parts from at least three different trucks, if not more. Regardless he took it to a big rock buggy competition and said it did fantastic through the mud. Gears and maybe a diff cam are I'm the near future. Thanks for all the help!