Differential or transfer case failure on the 1999 Jeep Grand Cherokee
1 crash 1 injury 2 of the 115 reports for this failure mention a crash, a fire, an injury or a death. Those are the owner's words on the complaint form, not a verified finding, and one report can mention more than one.
When differential or transfer case failure gets reported
Owners of the 1999 Jeep Grand Cherokee report differential or transfer case failure at a median of 45,000 miles. A quarter of the reports come in before 40,000 miles and a quarter after 60,000 miles, from 20 reports that carried an odometer reading.
A part like this is normally expected to survive 110,000 miles. It is the 5th most-reported problem on this model year.
The mileage distribution
The reported range runs from 25,000 miles at the tenth percentile to 75,000 miles at the ninetieth, a spread of 48,477 miles across the middle 80% of reports.
A window that narrow is the signature of a part that fails on its own schedule rather than on how the car is driven — which is usually a design or supplier problem rather than wear and tear.
25% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 25,000 miles | 38,843 miles | 47,000 miles | 62,000 miles | 73,477 miles |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Of these reports, 1 a crash and 1 an injury are mentioned. Owners write their own complaints and the agency does not verify them, so read this as what the reports say happened rather than as a confirmed count.
Putting it right typically runs $900–$4,200 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
The same failure on other years
The same failure is reported on 23 model years of this car. It shows up earliest on the 2021, at a median of 5,000 miles, and latest on the 2016 at 125,000 miles.
By volume the 1999 is the worst of them, which makes this a problem of this specific year rather than of the model as a whole.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
1999 jeep grand cherokee laredo, 6cyl. Mileage 78000. During refueling, fuel would not enter gas tank. After having one dealer look and state it needed gas filler tube which would have to be ordered. I manage to get gas in car and get home from 200 miles away. The next time I drove vehicle I notice gas leaking under the vehicle. Took to local dlr, they had to replace fuel line to gas tank and filler tube. This was a $470.00 repair. This is the 2nd time I have had a problem with the fuel tank system on this jeep. This is a vary serious situation due to fumes getting into the passenger area and the possibility of a fire from leaking fuel running underneath the car. Two other problems with this car is the transfer case leaks due to a bad o-ring(this is a 10 cent part that cost $500.00 to replace because the transfer case has to be taken apart), front wheel bearing going bad @ 78000 miles, replacement cost $400.00. Ts
Car was making a low pitched grunting noise, and slow on acceleration, took it to the dealership and found that the transfer case had a hole in it. Caused by the chain in the transfer case becoming loose and rubbing against the case.
Having problems with the rear end and transfer case problems. Also stated that the vehicle has been taken to a specialist for the transfer case and rear end and they have stated that they will quit working on that type of vehicle because they are coming with to many defective problems. Dealer was contacted and stated that the vehicle is out warranty. Manufacture was also contacted and stated that they don't have any type of problems with the vehicles. Ts
Also reported on the 1999 Jeep Grand Cherokee
Premature brake pad or rotor wear
Other powertrain problem
Other brake problem
Other body or interior problem
Other visibility problem
ABS module or sensor failure
How far this goes
Complaints are voluntary, so 115 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does differential or transfer case failure happen on the 1999 Jeep Grand Cherokee?
Across 20 owner reports that included an odometer reading, half were filed by 45,000 miles. A quarter were filed before 40,000 miles and a quarter after 60,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is differential or transfer case failure on the 1999 Jeep Grand Cherokee?
115 reports have been filed with NHTSA, about 0.9 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed