D30 questions

Nightpath · September 15, 2014, 06:44:24 AM

I was thinking the differential not axle....doh

What piece is it I need? Any pics?

captspillane · September 15, 2014, 06:47:16 AM

Quote from: captspillane on September 13, 2014, 09:05:41 AM
He's talking about the chunk of metal a few inches from the flange on the passenger side. The passenger side engine mount sticks down with two flaps that go on either side of that chunk. A bolt goes through both flaps and through the center of the hole, horizontal to the ground and from front to rear.

That quote of mine from a few days ago should help.

The picture you just took is of the main casting. That hangs on the Driver Side and they are all identical. The only potential difference is below your Passenger side engine mount. The passenger side engine mount gets swapped if you go from the early nondisconnect ('80 and '81 only) with the short hole to a newer axle. It doesn't matter if the newer axle is disconnect ('82-'86) or nondisconnect ('87-'88).

Nightpath · September 15, 2014, 07:02:28 AM

Ahhh crap I see now...Going to have to see if I can find one.

If not I'm pure SoL unless someone has one to get rid of.

carnuck · September 15, 2014, 12:56:18 PM

Which are you putting in? The larger or smaller diameter housing?

Nightpath · September 15, 2014, 01:37:16 PM

I'm putting the axle from the 81 into my 86.

I see that the axle I have in the pic has a shorter hanger block than the one installed on my Eagle. I'm heading over to the graveyard tonight to see if there are any that will work.

captspillane · September 15, 2014, 02:43:02 PM

All you need to do is swap engine mounts along with the axle. The engine mounts are otherwise identical and there isn't anything else keeping you from putting an older axle into a newer Eagle.

Nightpath · September 15, 2014, 04:51:11 PM

I'm putting an XJ engine into it.

I found a nice passenger side hanger from an 81. Was able to pull it with minimal issues so I should be good to go.

Nightpath · November 01, 2015, 09:22:21 AM

Posting an update to this.

I have the axle from the 81 SX4, a non disconnect with 3.54 inside. The differential pinion is shot (boo). My current Eagle is an 86 with 2.7x inside the non-disconnect axle, which doesn't match the 8.25 gearing that I installed in the rear so I have to re-gear the front to 3.55.

Now, I do have the guts from the Dana 30 that was on the XJ. Will these fit in either of the pumpkins? The differentials look identical when I put them beside eachother iirc, so I'm hoping all I have to do is buy a new pinion and some seals and put it back together with the XJ guts inside my current Eagle diff.

Has anyone done this?

carnuck · November 01, 2015, 11:58:41 AM

XJ's (except the last couple years of production in the 2000's), MJ's used high pinion. Eagles, ZJ's, YJ's and later TJ's used low pinion D30 fronts. (not sure on the pinion length though as there were 2 different low pinion ones)

3.54 is the most common ratio for ZJ automatics but some are 3.08 (rare 5 speeds) and some are 3.73 (Heavy Duty tow or sport package)

eaglefreek · November 01, 2015, 03:56:58 PM

You would need a low, long pinion set.

Nightpath · November 02, 2015, 10:10:22 AM

OK, here's what I have. Since I'm a simpleton today (a lot going on), let me know what I need.

Rear is a 8.25 with 3.55 gearing. Running it with a AW4 transmission with has identical ratios as the stock Eagle transmission, except Overdrive, which is 0.75.

SX/4 (1981) non-disconnect front axle with 3.54 (pinion wobbles bad, probably needs all new seals). Also has the longer hangar which I have
Eagle Wagon (1986) non-disconnect front axle with 2.73 - excellent front differential but doesn't match the rear. Uses the shorter hangar which I have
XJ (1994) front axle guts with 3.55 and the ring + pinion

OK, with this in hand what combo of gears and parts would you use? What is needed?

carnuck · November 02, 2015, 02:30:15 PM

If you have a Renix years AW4, it's 21 spline and .70 O/D. HO got the .75 O/D and 23 spline output.

I'm not sure which D30s got the long, low pinion.

Nightpath · November 02, 2015, 06:10:36 PM

It's a 1994 OBD1 drivetrain, HO all the way ahhhhhhh yeah

eaglefreek · November 03, 2015, 12:10:42 AM

Found this on the net. Eagle should have been included in this list.

std cut dana 30 Pinion length 8 9/16":
Aviator: 2003 - 2005 (Front)
Bronco: 1966 - 1971 (Front)
Jeep C101 67-74 (Most 86 and older D30's)
CJ5: 1971 - 1983 (Front)
CJ6: 1971 - 1983 (Front)
CJ7: 1976 - 1986 (Front)
CJ8: 1981 - 1986 (Front)
Comanche: 1986 - 1992 (Front)
Commando: 1972 - 1973 (Front)
Liberty: 2002 - 2005 (Front)
Scout II: 1972 - 1980 (Front)
Wagoneer: 1971 - 1973 (Front)
ZJ (Grand Cherokee): 1992 1/2 - 1996 (Front)

carnuck · November 05, 2015, 01:14:30 AM

Quote from: eaglefreek on November 03, 2015, 12:10:42 AM
Found this on the net. Eagle should have been included in this list.

std cut dana 30 Pinion length 8 9/16":
Aviator: 2003 - 2005 (Front)
Bronco: 1966 - 1971 (Front)
Jeep C101 67-74 (Most 86 and older D30's)
CJ5: 1971 - 1983 (Front)
CJ6: 1971 - 1983 (Front)
CJ7: 1976 - 1986 (Front)
CJ8: 1981 - 1986 (Front)
Comanche: 1986 - 1992 (Front)
Commando: 1972 - 1973 (Front)
Liberty: 2002 - 2005 (Front)
Scout II: 1972 - 1980 (Front)
Wagoneer: 1971 - 1973 (Front)
ZJ (Grand Cherokee): 1992 1/2 - 1996 (Front)

Comanche is high pinion D30 front if stock 4x4 because it's the same as an XJ Cherokee '84+

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D30 questions