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Discussion Starter #1
I will be swapping out my AMC20 for a high pinion D60. Does anyone kknow how much I will have to shorten my driveshaft? I don't have the 60 yet.
 

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Are you honestly trying to say that you'd trust someone's comments about a rig they've never seen, shorten your driveshaft however much they say, all before you even install the axle? <IMG SRC="smilies/rolleyes.gif" border="0"> You're either lazy or nuts. Buy a tape measure, that'll tell you for sure <IMG SRC="smilies/beer.gif" border="0">

[ 10-18-2001: Message edited by: Eric Ruhl ]
 

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The ring gear is almost 1" bigger so that will add another 1/2" to whatever the difference is between the two pinions so don't forget to add that in.
 

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roflmao.....

I like your style eric.

<IMG SRC="smilies/laughing.gif" border="0">
 

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Discussion Starter #5
Eric <IMG SRC="smilies/flipoff.gif" border="0">
I didn't even hint that I would do that. I also said I don't have the 60 to measure. I know you guys like to flame, but read the post & save it for someone more deserving.I know you'r just funnin anyway.
Just trying to get an idea beforehand & I'm sure others have done this same swap. <IMG SRC="smilies/rolleyes.gif" border="0"> <IMG SRC="smilies/clown.gif" border="0">
Thanks for the guess 66CJdean. I knew that much, but I figure the pinion shaft length could be shorter or longer, plus just the pinion being higher will make the shaft shorter. I guess I'm just hoping someone will say they did the same swap & did'nt have to shorten the shaft because the pinion (snout) is shorter. I'll find out for sure when I get it in.

[ 10-18-2001: Message edited by: CJ-Jeeper ]
 

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Originally posted by CJ-Jeeper:
<STRONG>I know you guys like to flame, but read the post & save it for someone more deserving.I know you'r just funnin anyway.</STRONG>
Only sorta funnin' actually.

<STRONG>I guess I'm just hoping someone will say they did the same swap & did'nt have to shorten the shaft because the pinion (snout) is shorter.</STRONG>
And in the grand scheme of things, what will that tell you? Surely you'll still measure everything yourself, so I don't see how any answer could be of value to you. You've asked a question that depends on your setup and the only answer is to go after it with a tape measure. NOBODY will be able to tell you with any certainty whether or not you'll need to change your driveshaft length or even better, how much you'll need to change it. Aren't you planning on upgrading the yokes/u-joints when you put the 60 in anyway?? If so then the whole question is moot.

<STRONG>I'll find out for sure when I get it in.</STRONG>
Bingo! Nothing wrong with figuring something out on your own <IMG SRC="smilies/thefinger.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">

Around here you should ask "how do I do this?", not "do this for me." <IMG SRC="smilies/beer.gif" border="0">

[ 10-18-2001: Message edited by: Eric Ruhl ]
 

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Discussion Starter #7
ER: I don't see how the rest of hte setup on my Jeep & someone elses would have any bearing on the question. It seems to me that either the measurement from center of axle to yoke is the same or not, and someone out there knows. Please explain. My apologys if this question is in fact unanswerable. <IMG SRC="smilies/confused.gif" border="0">

Thanks for bringing up the yoke question. I am planning on sticking with the 1310 since I don't break them now (except when I had bad axle wrap). Would I be risking damage to my d18 t/c if I upgrade to 1350? I've got too much money in my t/c to break it. I don't really want to buy 2 all new shafts either (gotta have the spare <IMG SRC="smilies/biggrin.gif" border="0"> ). It's a lot easier to shorten the ones I have. What do you guys think - should I spend the $$ and upgrade? <IMG SRC="smilies/beer.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0">
 

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A standard 60 and RC60 have the same length pinion and they are longer than a 20 for sure plus the extra 1/2" I stated before. I have done some looking for the length of each but didn't find anything but my guess is 1-1.5" total extra length between the two. Get a tape and tell me what a 20 is from the center to the center of the yoke, at least a good eyeball quess and we can go from there.
 

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Dont know about how it will work for you, but using a standard rotation 60, putting it spring over in place of a spring under AMC 20 on 4" lift springs needed no driveshaft modification.

Used the same axle location.

But ya know what? Ya just never know what the hell it will look like till it's in there.
 

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Discussion Starter #10
Thanks guys. My 20 is about 12.5", but there's no need for an exact comparison. It sounds like a sure thing that my shafts will be too long, right? So I know I need to budget at least enough to shorten them. Now the question is should I convert to 1350's at the same time? I don't break the 1310's now & don't see any reason that will change. I don't plan on giong any bigger on this Jeep either. When I do, it will be on something longer, maybe a CJ6. So, what do you guys think about the joints?
 

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It will depend on the yoke that comes on the 60. Some are 1310 and some are 1350's. If you do go 1350 you will have to run 2.5" dia. drivelines because spicer doesn't sell 2" fixed yokes or you will have to run the driveline with a 1350 slip yoke. A friend of mine runs 39.5's a 468 big block in a 5000+ pound rig and has yet to blow out the u-joint but it is 4 link so there isn't any driveline killing axle wrap. For me I would prefer to have the driveline be the weak link.
 

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Discussion Starter #12
It sounds like you are thinking I would be fine w/ 1310 as long as I keep the wrap under control & a 1350 might possibly make the t/c my weak link. Was your friend useing 1310? Let me know if I have misinterpreted & thanks for the info. <IMG SRC="smilies/beer.gif" border="0"> I'm getting the axle from SNOWBALL & he siad it had a 1350, but he will swap on a 1310 for me. Now I just have to see if I can get an overdrive gear from O'brian so I can run the 5.13's that are in it since I don't have a tow rig. <IMG SRC="smilies/smile.gif" border="0"> <IMG SRC="smilies/jeep2.gif" border="0">
 

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Yes he used 1310's. You would have to change the yoke on the t-case to 1350 or you gain nothing so I would say go 1310.
 

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Discussion Starter #14
thanks <IMG SRC="smilies/beer.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0">
 

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Originally posted by CJ-Jeeper:
<STRONG>thanks <IMG SRC="smilies/beer.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0"></STRONG>
I am only running a 304 with T18a in front of my 60's with 6.17 gears and 16x38.5x16.5 TSL but have no problems with the 1310 unjoints. I did grab the sawzall and stretch the tub and frame of my CJ5 turning it into a CJ6, so I have nice mild ujoint angles though.
 

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I measured a 60 pinion and it was 8.625 not counting the threads for the yoke. This was a 5.13 RC60 pinion not that it should matter.
 
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