Dauntless Drivetrain Change |
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JeepFever
Member Sponsor Member Joined: 07 Aug. 2012 Location: VA Status: Offline Points: 2735 |
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Currently at 69:1 . . 7.06 x 2.62 x 3.73 tranny x xfer x diff
Edited by JeepFever - 14 June 2019 at 2:08pm |
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AKoller
Member Sponsor Member Joined: 19 Sep. 2018 Location: Moundridge Kans Status: Offline Points: 647 |
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I will be just a bit lower with my 4.89 ratio. 7.05 x 2.46 x 4.89 = 84.80 (85:1) Did you ever get your floor patched back together? I'm thinking I will source a M38 transmission/bell housing cover to modify on mine. That would give a person a lot more room to work on things from up above. |
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1950 CJ3A "Thumper"
1966 M151 A1 1942 GPW #70221 |
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oldtime
Member Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 4139 |
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I asked about the brand because I believe the STA'a make the tallest 7.50 x 16" NDT.
I'm really not surprized at all with NDT grip in the rocks. I still think they are the coolest tire ever for a Willys rock crawler. The Nato tires would be way cool too but no 7.50 x 16's to be found.
I've always claimed NDT's are an excellent rock tire and not bad as a forestry service tire either. About the only rock exception will be moss cover creek boulders. They are by far the best tire ever on loose creek gravel roads. They never pick up a stone. |
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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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jpet
Moderator Group Sponsor Member x 5 Joined: 30 Apr. 2008 Location: Ramsey, IL Status: Offline Points: 11173 |
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It's interesting that the STA 750-16s are advertised to be 32.5 diameter and show the smaller lug pattern like the 700-16s. I have even seen old pictures of such a tire but I have searched high and low and made many phone calls. Today, all STA and Firestone 750-16 NDTs have the same tread pattern. Large lugs and 31.6 diameter. I wish I could get a tire with the smaller lugs and 32.5 diameter and I suspect that they made them at one time which would explain the discrepancy in their description at Coker, Universal Tire, and so on but the manufacturers claim that it has always been the same mold from day one
Edited by jpet - 14 June 2019 at 4:12pm |
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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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jpet
Moderator Group Sponsor Member x 5 Joined: 30 Apr. 2008 Location: Ramsey, IL Status: Offline Points: 11173 |
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Firestone advertised as 31.6:
https://www.universaltire.com/firestone-tires/firestone-military/750-16-firestone-military-ndt.html STA advertised at 32.5: https://www.universaltire.com/750-16-sta-military-ndt.html but if you buy them, they both have identical tread. Large lugs and 31.6 diameter. Would love to find the smaller lugs in a 750. |
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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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oldtime
Member Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 4139 |
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Jeff that's interesting .
I was definitely planning to get a set of the 7.50 x 16" STA's for my crawler build. I have a set of the 7.50 x 16 STA Super Traxions and those definitely measure over 32" tall. I forget what I measured them at... I think it was 32.7". Edited by oldtime - 14 June 2019 at 10:39pm |
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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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JeepFever
Member Sponsor Member Joined: 07 Aug. 2012 Location: VA Status: Offline Points: 2735 |
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85:1 should work really well for "rock crawling", . . less riding-the-brakes when dropping off rocks, etc. . . . . 55-60mph might be a little "busy". If you do not drive far on road much, then 4.89 should work out good. No progress on finishing tranny cover During the build, I cut out the floor to the same dimensions as M38. I love the access it gives to drivetrain. For example, I kept the stock clutch linkage, (bellcrank and cable). with the cover removed, I can adjust the clutch from the driver seat. For now, I have a M-38 repo cover, (cut out to clear the SM420), then a piece of carpeting to cover the remaining hole . It is ugly/tacky, but actually kinda functional. The carpet keeps heat out when weather is warm, but is easy to remove if cold outside. If cold, it is nice to have that flow of heat coming up. |
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AKoller
Member Sponsor Member Joined: 19 Sep. 2018 Location: Moundridge Kans Status: Offline Points: 647 |
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Where did you source the M38 cover? I haven't had much luck finding one yet. With my 4.89 gears I run roughly 2700rpm at 55 and around 3000 rpm at 60. I must admit that 45-50 mph is much more comfortable only turning a round 2000 rpm.
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1950 CJ3A "Thumper"
1966 M151 A1 1942 GPW #70221 |
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JeepFever
Member Sponsor Member Joined: 07 Aug. 2012 Location: VA Status: Offline Points: 2735 |
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Mine is a repo from Walcks. I actually bought it for another project, but stole it for Wilson. https://walcks4wd.com/lower-bolt-in-transmission-floor-cover-plate-assembly-1950-1971-m38-m38a1-cj5-cj6.html An interesting note at bottom of page - > "does not fit CJ5/6 with 4 speed". If those can be found, I wonder if they are high enough to clear a SM420? I imagine it depends on how high the SM420 is stuffed up into cab. I doubt it would clear mine, but might be a better starting point? |
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JeepFever
Member Sponsor Member Joined: 07 Aug. 2012 Location: VA Status: Offline Points: 2735 |
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I was looking for some rock-crawling photos to post in local Jeep group. My most recent ones would be from Jpet's video, so I was looking for stills from that.
This is not one of the best looking shots, but I thought it was interesting to show the tire wrapping around a rock. edit: running around 12psi This is a kinda pretty one, and shows front tire at full stuff. (It looks in photo like it is rubbing hard, but there are only very small witness marks on Wilson's inner fenders, on all 4 corners) Edited by JeepFever - 26 June 2019 at 5:44pm |
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smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6123 |
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Nice pics Ron.
I’m always trying to get people to air down when they go out with me. This is just another witness that it works. Still some people are reluctant.
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Joe Friday
Moderator Group Sponsor Member x 2 Joined: 26 Dec. 2010 Location: Jeep Central Status: Online Points: 3633 |
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Airing down tubeless radials for terrain like the Rubicon doesn't help if you drop the pressure enough to actually lose axle clearance.
Tube type bias tires improve more when aired down, and don't split like radials due to cross plies. As long as you are prepared to fix a snagged tube, I agree with Stan's observation. |
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JeepN95YJ
Member Joined: 27 June 2018 Location: Cincinnati Status: Offline Points: 35 |
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I disagree that airing down radials doesn't help. Even if you do lose a little clearance the extra traction is worth the compromise.
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jeepsterjim
Member Joined: 13 July 2011 Location: lincoln, ca Status: Offline Points: 1274 |
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Doing any good trail such as the Rubicon most of us would air down to 10 PSI. What a difference in traction. Huge difference in dune running as well.
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Jim
CJ-2A - 81299 |
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jpet
Moderator Group Sponsor Member x 5 Joined: 30 Apr. 2008 Location: Ramsey, IL Status: Offline Points: 11173 |
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Grandpa’s Jeep and Wilson rock the NDTs!! Stan and Ron are the guys who bring a knife to a gun fight .... and win!!
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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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JeepFever
Member Sponsor Member Joined: 07 Aug. 2012 Location: VA Status: Offline Points: 2735 |
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Finally starting to finish the floor. The tranny has been in place for over a year now, it seems to work well where it is located, so not likely to move it.
As mentioned before, I cut out the floor to dimensions of M38 cover. Lots of opening to access the tranny etc. from above. . . . for the new floor, I made a "bow" out of 11 ga. down the middle . . it will help support the right front corner of driver seat. From that, I will add a pieced together cover over the tranny. To the rear of the bow, will be solid welded in floor, with clearance over the D300, and the speedometer cable. Rear of the bow will be solid. Forward of the bow will be 3-piece removable cover. It will be made from a cut-up M38 cover, and other various sections of floor and shaped sheet metal. Not an easy task, but hopefully not too bad. Some of the tentative starting pieces: |
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Ol' Unreliable
Member Joined: 25 Sep. 2016 Location: CO Springs CO Status: Offline Points: 4226 |
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Jigsaw puzzle time.
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There's a reason it's called Ol' Unreliable
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JeepFever
Member Sponsor Member Joined: 07 Aug. 2012 Location: VA Status: Offline Points: 2735 |
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Perfect description! I thought I would make some good progress today, because I took 1/2 day vacation. About the point I made some decisions on how to proceed, I got a call from Father-in-law that a pipe had started leaking badly in crawl-space of house, and was hoping I could come fix it. My afternoon was shot.
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