Ran a smaller spare for too far... - JeepForum.com
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post #1 of 28 Old 07-17-2017, 07:57 AM Thread Starter
congerz83
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Ran a smaller spare for too far...

I put a smaller spare on my 5.9 to try to get home after a blowout...

I knew I was playing with fire... And after about 20 miles KA-BOOM...

My question is... Did I damage the transfer case? Or the front diff? I have a 242 sitting in my old 4.0 that I could put in, but I'm not really interested in putting a front diff in this thing.

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post #2 of 28 Old 07-17-2017, 08:11 AM
mosey2001
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You will of course have to pop them open. I have seen this affect the diff. However the only time I was actually there to see. The entire case of the diff literally cracked in half. My experience was with a full size trucks however so maybe that was different all together.

I'd pull diff covers first.

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post #3 of 28 Old 07-17-2017, 12:05 PM
kg6mov
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You probably blew the chain on the t-case, or you shredded the VC.

Should have pulled the front driveshaft . . .

Pull the diff cover to find out, then pull the front shaft and see if the front output on the t-case spins free.


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post #4 of 28 Old 07-17-2017, 12:31 PM
snkenai
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I bought mine with the front diff destroyed from same tire issue. It ruins the viscus coupling and throws too much pressure on the front diff. I pulled the front drive shaft and front axle cv joints. reinstalled the stub axles to hold the hub bearings. Now it's drive-able as 2wd, temporary for occasional short errands. Not maybe recommended, but doable.

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post #5 of 28 Old 07-17-2017, 12:50 PM
jeepjeepster
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So whats the symptoms? What size was the spare tire?

My 94 came with a donut spare tire.. Never used it and probably never would for obvious reasons.

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post #6 of 28 Old 07-17-2017, 03:22 PM
HighLonesome
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Whoever came up with donut temporary spares should have their balls in a vise.
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post #7 of 28 Old 07-17-2017, 03:47 PM
kg6mov
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Jeep actually did a recall for donuts on 249 equipped ZJ's because of this issue.


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1984 F250, 460 BB, T19, work truck/future tow pig
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I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #8 of 28 Old 07-18-2017, 05:54 AM
jeepjeepster
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Originally Posted by kg6mov View Post
Jeep actually did a recall for donuts on 249 equipped ZJ's because of this issue.
For whatever reason it was only on certain years... And are you sure it was a recall and not a TSB? Im not sure honestly. My 94 does not have a recall listed for the spare tire.

I remember someone posting that the donut spare works on the 93-95 ZJ's b/c the VC allows for more slip... No idea if that is true but Im not risking it. Ill just get it towed if I have a flat I suppose...

1994 ZJ-I6 w/216,000 mi
1998 ZJ 5.9 w/65,155 mi Slate Black
2004 KJ w/90,300 mi
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post #9 of 28 Old 07-18-2017, 10:18 AM
Timo_90xj
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Quote:
Originally Posted by jeepjeepster View Post
I remember someone posting that the donut spare works on the 93-95 ZJ's b/c the VC allows for more slip... No idea if that is true but Im not risking it. Ill just get it towed if I have a flat I suppose...
No matter if you have a '93-'95 or a '96-'98, a donut spare will destroy the VC very quickly.

IIRC the donut spare tire thing was a TSB, but they were replaced by the dealership to a full size one. Later ZJs that had a 249 came with a full size spare from the factory.

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post #10 of 28 Old 07-18-2017, 11:01 AM
jeepjeepster
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Quote:
Originally Posted by Timo_90xj View Post
No matter if you have a '93-'95 or a '96-'98, a donut spare will destroy the VC very quickly.

IIRC the donut spare tire thing was a TSB, but they were replaced by the dealership to a full size one. Later ZJs that had a 249 came with a full size spare from the factory.
I was thinking it was a TSB but wasnt sure.. From what I understand that only applied during the warranty period.. Think my warranty has ran out

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1998 ZJ 5.9 w/65,155 mi Slate Black
2004 KJ w/90,300 mi
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post #11 of 28 Old 07-18-2017, 11:15 AM
Mopar4U
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Why does a smaller tire destroy the transfer case?
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post #12 of 28 Old 07-18-2017, 11:25 AM
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It's due to the sensitivity of the Viscous Coupler. it wears out due to heat and uneven tires [of which a donut is obv not the same as other 3] causes more heat and use.

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post #13 of 28 Old 07-18-2017, 01:00 PM
kg6mov
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A smaller tire spins at a different speed, so the VC sees a speed differential and locks up. Normally that's a good thing because a speed differential means that a wheel or wheels are slipping and locking up the VC sends power out evenly so the wheels with traction can bite, eliminating the speed differential. Of course the smaller spare will never "bite" and the VC will cook.
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1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #14 of 28 Old 07-29-2017, 12:35 PM Thread Starter
congerz83
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Ok... I pulled the driveshaft finally and the front diff is still making noise...

Can I just pull the axles and diff out of the enclosure?

The wheel bearing is enough to hold things together, right?
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post #15 of 28 Old 07-29-2017, 12:54 PM
kg6mov
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The wheel bearing needs a stub shaft putting preload on it or it will fall apart.

Have you looked inside the diff?


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1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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