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FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitThe Original 3/8" Ruffstuff Diff Cover!Building a Bumper?

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Unread 04-30-2002, 01:07 PM   #1
GRUB
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xfer case questions

Just bought a wrecked 74 from my bud at the towing company. $35 bucks and he pulled it home for
me, couldn't pass it up. Already recovered my cash in the new bikini top I found in the tool
box. Is the 20 stouter than the 18? I bought it for small parts, the xmission, and brakes, which would
both be an improvement over what I have. Would it warrant swapping in the 20 and doing
the axle swaps to accomodate it? Any advice appreciated.

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Unread 04-30-2002, 08:01 PM   #2
jeepdaddy2000
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It's almost the same transfer case. The main differance is the driveline exits in line with the input shaft on the 20 and on the passenger side in line with the front driveline on the 18.The 20 will be a little quieter while driving. As for the trans. if it is a 3 speed than it is probably a T14A(same as yours). Of course if it is a 4 speed then you SCORED!T18 baby! The brakes would be a good swap along with the steering box and mount. The D30 front axle is'nt much stronger than the 27A but parts and upgrades are much easier to find. Hope this info helps.
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Unread 05-01-2002, 12:14 AM   #3
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Jeepdaddy,
Just pulled it in this morning, then went to work, haven't had time to thouroughly see what I've got. Looking at the xmission and trying to match it to the haynes manual pictures, it looks more like the 176. It's behind a 258. If I did score, which I'm hoping I did, will I need to do the mods we discussed earlier, or will it be a straightforward swap? As far as the steering, its power, but there may be some damage, feller nosedived it off a hill it appears, I know the gear box is bad cause it's leaking on the wifes driveway. Yak Yak Yak!! Thanks in advance.
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Unread 05-01-2002, 08:19 AM   #4
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Is the tranny a 3 or 4-SPD? The T-14A looks a bit similar to the T-176, but the T-176 is a 4-SPD used from '81-'84 behind the sixes. Could have been swapped in at some point.

The T-14A (rated for 230 ft-lb of torque net) was used behind the sixes from '72-'75, then the T-150 was used behind the 6 from '76-'79, both 3-SPDS. The T-15 3 spd was used from '72-'75 standard behind the V8. All look a bit similar to the T-176 from the exterior at quick glance. Best bet is to check the tag unless you can see one of the differences and identify it. If you do have the T-18, tho, that would be good (4.02:1 first gear).

The Dana 20 TC is considered to be better in the durability department than the 18, with a superior direct-drive centered rear output, and the troublesome tailshaft-mounted parking brake was eliniated. The only "downfall" is the marginal 2.03:1 low range vs. the Dana 18s 2.43:1.

The Dana 30 front axle, though similar to the Dana 27, and being an open-knuckle, was 25 pounds lighter, and reduces the turning radius by 6 feet over the old 27.

The Dana 44 used stock from '72-'75 was improved from the older one by using flanged axles, instead of the old tapered ones. Otheriwse was the same.

Good Luck, hope this helps you in your decision-making!
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Unread 05-01-2002, 11:03 AM   #5
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Well, removed the access cover and still did not find any tags, found one on the xfer case but that didn't help. Here's what I do know, 4 speed, standard H with Rev. right and down. Good positive firm gear engagement, (much better than the 14 in the grub). No access plate on the left side as shown on the hayne's illustration of a t18/98. Fill plug right side, appears at a slight angle(?), drain plug centered in front and bottom. This thing looks like its been in there since day one, but over 30 years any number of things could've been swapped, so I won't rule that out. Regardless of what it is, if it'll go in without too much headache I'll put it in the grub, unless I find something wrong with it once I get it pulled. Probably use the 20 just to get rid of the useless parking brake that wouldn't hold it on level ground much less a hill. New Question: ID tag on grub's rear has 4 88 on it, which I take to be 4.88's. Heap has 41 11, 4.11's??? If so, will the 4.88's work in the 74 axle?, not up on the tapered/flanged thing yet. Appreciate the information given so far, and hope that what I've posted ID's the thing.
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Unread 05-01-2002, 04:56 PM   #6
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Ok GRUB, here goes. It sounds like the trans is not a T18( reverse is right and up. there is a large bulge at the left rear to accomidate the reverse idler).Stupid me, this is a prefect example of assuming that eveything is stock. While I can't tell you what you have, I can tell you(my opinion)that any later model cast iron cased trans. is better than the T14A. I have broken 2 of these in my Jeep over the years, neither breakage was under harsh conditions. As for the rear axle, yours is a flanged axle. The only differance between yours and the donors is the 74's has a centered diff.(both axles are the same length) so it will align with the D20 output shaft. The R&P are the same. The real question here is after all the trouble to swap all these componants what are you gaining?If you swap the front you will have to buy a R&P if you want to retain the 4.88's.Otherwise you will probably want to swap everything to keep the axle ratios the same(3.73, 41/11 is the ring /pinion tooth count). Gotta go, I'm late for soccer practice, will send you more later.
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Unread 05-02-2002, 12:17 AM   #7
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Jeepdaddy and 4 wheeler, thanks for your replies, very informative. The plan was finalized today when it was discovered that the front axle sustained damage in the wreck. Final plan: put the mystery 4 speed in, mated to the 20, swap the rear axle and put the 88's in it. Put the big brakes on up front, hook up the new parking brake, and get the heap out of my basement. Thanks again for the insight.
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Unread 05-02-2002, 07:52 AM   #8
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Sounds like a fail-proof plan, given that the front end is toasted. <img border="0" title="" alt="[Wink]" src="wink.gif" />
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