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Offset dana 44 10 spline to full float 30 spline |
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Noah 
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Joined: 07 Aug. 2021 Location: NS Canada Status: Offline Points: 75 |
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 Topic: Offset dana 44 10 spline to full float 30 splinePosted: 21 Sep. 2021 at 7:58pm |
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I'm looking at Herm's dana 44 full float kit to upgrade from 10 to 30 spline shafts on my M38. I'm planning to use a Lock Right or similar lunchbox style locker, but I'm not sure if I can keep my original carrier or not where I would be going from a 10 to 30 spline shaft?
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1952 M38-CDN
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chasendeer
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Joined: 24 Feb. 2012 Location: Napa,CA Status: Offline Points: 1086 |
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Posted: 21 Sep. 2021 at 8:07pm |
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I would not buy that kit. Do a search on this forum for sanity check and follow those posts. You’ll end up with a lot better axle
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oldtime
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Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 4184 |
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Posted: 21 Sep. 2021 at 8:08pm |
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No you would have to change the complete differential unit to go with 30 spline shafts.
However you could upgrade to 19 spline side gears and use the original 10 spline differential. You cannot install 30 spline side gears on the existing differential.
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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jeepsterjim
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Joined: 13 July 2011 Location: lincoln, ca Status: Offline Points: 1283 |
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Posted: 21 Sep. 2021 at 8:18pm |
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I'm not to thrilled with Herm's "anything". Products are very high priced and most are made overseas.
Edited by jeepsterjim - 21 Sep. 2021 at 8:21pm |
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Jim
CJ-2A - 81299 |
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oldtime
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Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 4184 |
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Posted: 21 Sep. 2021 at 8:33pm |
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IMHO 19 involute spline is plenty strong until you install a hopped up v-6 or bigger. Or get into extreme crawl ratios.
Edited by oldtime - 21 Sep. 2021 at 8:34pm |
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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Noah
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Joined: 07 Aug. 2021 Location: NS Canada Status: Offline Points: 75 |
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Posted: 21 Sep. 2021 at 8:55pm |
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Thanks, I see the issues with it now. When I first looked at the kit I was thinking that one spot looked like a failure point and now I see its been confirmed.
Edited by Noah - 22 Sep. 2021 at 7:41am |
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1952 M38-CDN
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Noah
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Joined: 07 Aug. 2021 Location: NS Canada Status: Offline Points: 75 |
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Posted: 21 Sep. 2021 at 9:01pm |
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I do plan on going to a v6 and ford t18 or sm465 in the future. Ideally I would source a flanged offset 44 and be done with it, but they are just not available.
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1952 M38-CDN
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oldtime
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Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 4184 |
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Posted: 21 Sep. 2021 at 9:08pm |
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Yes the offset flanged D44’s are ideal and yes they have 30 spline shafts.
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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jeepsterjim
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Joined: 13 July 2011 Location: lincoln, ca Status: Offline Points: 1283 |
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Posted: 21 Sep. 2021 at 9:40pm |
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The off set flanged is a good choice. Be patient and one will pop up for ya. I picked one up with a dana power lok for $125.00. You can get a waggie or ? D-44 flanged and cut it down. Ever thought of using a centered 44 along with a 20 x-fer case? Lots of good options. Brannon Metcalf might have a few ideas for ya.
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Jim
CJ-2A - 81299 |
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Noah
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Joined: 07 Aug. 2021 Location: NS Canada Status: Offline Points: 75 |
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Posted: 22 Sep. 2021 at 7:26am |
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I have a freshly rebuilt 1 1/4" D18 with a warn OD plus a complete spare so I'd like to stay with an offset axle. I looked at Brennan's full float housing ends and I like that idea, but then the issue is sourcing axle shafts. Being in Canada parts availability is lacking and shipping adds up fast.
Edited by Noah - 22 Sep. 2021 at 7:41am |
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1952 M38-CDN
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oldtime
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Posted: 22 Sep. 2021 at 9:02am |
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So if you plan to run a 4 speed behind a v-6 you can easily run most any final drive ratio you want. However if you run 25% overdrive there is no advantage to gearing the FDR above 4.56 ratio.
Well built 19 spline axle shafts can handle the torque IF you treat them with regard. But as I suggested a Jeep 1970-1971 offset flanged with factory optional 4.89 gear set would be ideal. One of those same axles was just sold at the Willys reunion by fellow board member Old Pappy. I have several in my garage right now but not selling any more at this time. However it is likely that I will sell one more in a couple years from now. So yes they are out there if you plan ahead and keep searching.
Edited by oldtime - 22 Sep. 2021 at 9:07am |
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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Noah
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Joined: 07 Aug. 2021 Location: NS Canada Status: Offline Points: 75 |
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Posted: 22 Sep. 2021 at 12:39pm |
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Regarding the over drive, I have seen some conflicting information to how well the bowl gears hold up to off-road use. I'm not set on keeping it if there's a risk of damage, but I'm still going for something that's decent on the street with the primary use being off road.
Final form I'm thinking 4.3 V6 or similar, ford t18 with 6.32:1, stock t-case gears (2.46:1), 4:10's in the axles and 31's (If I don't keep the over drive or 4.56 / 4.88 final gears with OD). How does this look for a final crawl ratio compared to stock?
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1952 M38-CDN
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oldtime
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Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 4184 |
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Posted: 22 Sep. 2021 at 1:15pm |
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Well I think talking ideal “crawl ratio” is nearly a whole topic all by itself.
0ne build I really like is D-225, Jeep T18 @ 6.32 and D18 @ 2.46 with FDR @ 4.89. That allows for a standard crawl ratio of 37/1 and also a slower 76/1. And you can still get s great cruise ratio at 3.66/1 with OD. Another highly versatile drivetrain would be D-225, Jeep NR or WR T18 @ 4.02 or 6.32. Without OD and teralow D20 @ 3.15 with 1972-1975 Jeep center flanged D-44 @ 3.73. The 6.32 T18 Teralow D20 would provide crawl ratios at 36/1 and also at 74/1. Plus you get the 3.73 cruise ratio and simply don’t need an overdrive. Here for D18’s I consider the 1970-1971 narrow track offset flanged ideal. For D20’s I consider the 1972-1975 narrow track center flanged axles as ideal. Edited by oldtime - 22 Sep. 2021 at 1:19pm |
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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windyhill
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Joined: 14 Mar. 2009 Location: North East PA Status: Offline Points: 1395 |
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Posted: 22 Sep. 2021 at 1:22pm |
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I run a 226 v6, T18 4 speed, dana 18, Overdrive, and 19 spline 44 with 5:38's I have yet to brake an axle. I have done some good trails and even crawled through rock beds, but don't regularly beat it in the rocks. I love the combo. And go Ford t-18 over the SM465! It's a super great trans, fits in way better and probably 75 lbs lighter! I've done both swaps. I do have a offset flanged 44 just in case but haven't needed it yet. Actually I have a few extras as well, but your not really close to PA.
Edited by windyhill - 22 Sep. 2021 at 1:25pm |
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'48 CJ2A
'53 CJ3B '59 CJ6 '65 CJ5 '67 CJ5 |
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Nick_
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Posted: 22 Sep. 2021 at 5:51pm |
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For what it's worth, I made it through the Rubicon with an L134/T18/Teralow D18 with a welded Dana 41 that's been sunk in the mud more times than I can count. Driving style is directly related to longevity of equipment.
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Lee MN
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Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4950 |
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Posted: 22 Sep. 2021 at 7:27pm |
Well Said! 👍🏽👍🏽👍🏽 Lee 
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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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duffer
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Joined: 02 Feb. 2012 Location: Bozeman, MT Status: Offline Points: 1087 |
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Posted: 22 Sep. 2021 at 9:20pm |
Perhaps driving technique does trump all but I use my Warn OD in low range, off road, all the time. In 47 years of that behind a trio of small block Chevy's, never a problem with the OD. It has been rebuilt once but it still had ALL the original gears until I put the TeraLow's in and it received the corresponding 26 tooth bowl gear.
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1955 3B: 441sbc,AGE 4 speed transmission, Teralow D18w/Warn OD, 4.11:1 D44's/ARB's, glass tub & fenders, aluminum hood/grill, 8274, York OBA, Premier Power Welder; 67 CJ5: 225,T86AA, D18, 4.88's, OD
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Nick_ wrote: