Dana 27 Front Driveshaft Discussion...

Working on my '67 CJ6 V6 in my signature. I did a search on "Dana 27 driveshaft" and read a bunch about the different size ujoints for the V6.

My original driveshaft has the small ujoint (1100) in the front (at axle) and a standard 1310 in the rear (at transfer case). This seems different than what I've read here.

I've been looking for a replacement driveshaft and have bought a couple as pictured below. Now I'm thinking, why can't I upgrade the pinion yoke and use one of the driveshafts that I bought? I have found a yoke here. Neapco N2-4-4061X Dana 20 and Dana 18 Transfer Case 10 Spline CV yoke 1310 series

Here's the three driveshafts I have with my original in the middle.

 

isn't the one on the bottom a shaft from a F134 JEEP?

 

I honestly don't know what it's from. I bought it based upon length before I realized how thin the original driveshaft was. That's when I bought the second one and got a lesson on the difference in ujoints.

 

Well I went ahead and ordered the pinion yoke from Denny's. Will keep you posted on how it goes.

 

I pulled the front pinion yoke off today. Literally had to use a puller to get it off. Anyway the replacement I received was 10 spline. The one I pulled off is 26 spline. I'm confused. Everything I've seen suggests that it should be 10 spline. There is a 26 spline, 1310 yoke for a Dana 30. Anyone know if it will work?

 

Yes all D27 for V6 had 26 spline yokes and all hadthe smaller 1100 joints.
All CJ's with 134 engines use the 1310 joints.
10 spline yokes were used on all D25 axle assemblies.
Very early D27 axle assemblies also used 10 spline yokes with 1310 joints.
Those early D27's came out in 1961 for a very short time and were gone again before 1962.
By 1963 the D27 axle assembly re-emerged as the D27AF and they then had 26 spline pinions along with 1310 universal joints.
The 1310 joint was always standard but was not for V-6 applications
Post 1970 D44 yokes and all D30's have 26 spline pinions with 1310 joints.
All D30 and all rear yokes prior to 1976 (Corporate model 20 rear axle) will fit your D27.

 

The splined area/depth on the fine spline 27 yoke is different than the 30, 44, and Corporate model 20 units. I've posted pics with the differences in the past. Not sure if they are still on the wayback machine or not.

Another option for a source for the correct fine spline 27 yoke for the 1310 series u-joint would be Scout 80's and 800's.

 

Here's the pic I was talking about. Yoke on the left is the 27. One on the right is a Dana 30 or 44 or one of the real late model 20 transfer cases that also used a 26 spline output shaft.

I just remembered the AMC Corporate 20 yoke is different than the 30 and 44 as well. The seal surface is a different diameter and there are other differences due to the collapsible spacer used for setting drive pinion bearing preload on the 20 differential.

 

Hmmn ! I thought the 26 spline yokes were all basically the same ?
Some certainly have a little more mass than others.
But honestly I have not messed with many D27 axles.
Perhaps you better heed Nicks advise on that.

 

Thanks for the info. Does the 2nd gen or late 4 cyl D27 have a fine spline or course spline pinion yoke? I'm trying to figure out if there's a stock-type yoke available with fine splines and 1310 u joint for the D27.

Nick I did see your reply to the other thread suggesting the IH 80/800 yoke. Thanks.

 

Yes the later Dana 27AF front axles will all have fine splines.
The 4 cylinder CJ's will have 1310 joints.
I can look up the part numbers if I remember too do it.

 

I only came up with 2 numbers for the D27 yokes.
#926816 which fits ??? and the 936216 number which is specific to V-6 applications.

 

My (incorrect as it may be) assumption was that it would be the same axle for both V6 & 4 cyl vehicles with only a pinion yoke change. I couldn't imagine why one would have fine spline and one coarse. I don't have the part numbers in front of me now but I found 3 different axles for early CJ5s. One was for early w/D27 (pre-V6 I assume?), then two for the later models with both engines. I bought the pinion yoke referenced above for an IH Scout. I hope it gets here before the weekend to see if it will work or not. Getting my driveshaft is suspended until I work this out. Thank you to everyone for your interest and feedback.

 

Fine splines are stronger, and would be an upgrade.

Do the F134 Jeeps get the coarse spline yoke even after the 225 was introduced? Seems unlikely Dana would supply two different axles once the 27 had been upgraded.

 

Pretty sure that all 27s were fine spline by 1964 or so. After the change I do not believe Jeep ever went back to the course splines.

 

I could be off but I thought that only the very first production of D27's had 10 spline yokes when the D27's emerged in 1961.
Then shortly after that Jeep went back to using the D25 for about another year.
After that time only fine spline D27's were used on a CJ's but all V-6 CJ's had the smaller yoke.

Anyone else shed some light on the early D27 mystery era ?

 

i believe you are correct Ken. 25s were 10 spline. Early 27s (like...REAL early) MIGHT have been 10 spline. But all later 27s, for sure, were the 26 spline. Only the V6 got the small u joint yoke, ever. All 4 cyl applications got the wide yoke.

 

I mis-spoke. I did find three part numbers but one was for the D25 which was A-1445. The other two were the same ones you list. I also checked the D44 just for grins and it shows PN 807693.

I can't find the axle numbers referred to above in the axle listings.

 

There were no Jeep Universal parts list after Feb 1962 untill early in 1966.
That is the timeline in question.
The axle numbers listed above for use with yoke # 936216 are seen in catalogs after 1966 timeline.
The axle numbers listed above for use with yoke #926816 must be from sometime between 1961 - 1965.
Those axles were already obsolete before 1966.

 

Am I reading that right? Showing the same P/N for the I4 and V6 Dana 27 yoke...... 936216.