1984 JEEP CJ7
4.2L / 258 cubic-inch six-cylinder 5-speed transmission with up to 20 MPG
Early in 2013 Woody swapped straight across his 200k-mile 1999 Chevy Suburban for this CJ7.
As initially received it's a bit rough but has lots of potential to be rugged Colorado mountain transportation.
On the day of the trade it showed 162888-miles on it.
Woody first filled up the gas tank paying 3.34.9-cents per gallon.
Following on this page are photos of it as first received and
tracking through the restoration process.
maiden mountain voyage:
During the first two days of November, 2013 Lorelei and Woody took the Jeep up into the Colorado Rockies
to about 8700-feet into snow and cold for it's real, major, distant and rugged winter voyage.
Overall the Jeep performed quite well for it's age but we discovered a few maintenance items as yet to be fixed.
a good mystery
and there is certainly one here:
Carfax records for this 1984 CJ7
start on January 31, 1994 at 90,385-miles
when it was right at ten-years-old
and it appears on radar for the first time to be registered in Denver, Colorado.
Carfax representatives claim this could be because:
a. The CJ7 started it's life as a US Government vehicle (most likely) or
b. The CJ7 was owned and registered overseas (less likely)
(apparently US, Canada, Mexico registration would have shown up) or
c. The CJ7 was never registered at all for its for ten-years but drove it 90k miles (way less likely)
Related thoughts and observations:
The dark Nordic Green paint appears to be the original color.
There is a likelihood that it did not start life as a Laredo as there was originally
- No tach, no clock, no tilt-steering wheel (all should have been stock on a factory Laredo).
I suspect for the first ten-years (90,000-miles) this Jeep had served as a US Government vehicle
If you have an opinion or facts then please
Email: Click Here To Email Woody
CJ-7 Hard-Top 4.2L 5-speed
as offered for 1984 in North America U.S.
Data for Jeep CJ-7 Laredo Hard-Top 4.2L 5-speed, model year 1984, version for North America U.S.
with 3-door wagon body type, 4x4 part-time (NP208, rear permanent, front engaged manually in off-road conditions)
and manual 5-speed gearbox.
Length: 153.2 inches
Width: 65.3 inches
Height: 71.0 inches
Wheelbase: 93.4 inches
- This is ten-inches longer than a same-year CJ-5
Front track: 55.8 inches
Rear track: 55.1 inches
Ground clearance (stock): 7.5 inches
Turning radius: 35.9 feet
Curb weight (empty): 3090 pounds
GVWR: 4149 pounds
Payload available: 1060 pounds
Braked trailer max: 2000 pounds
end - Standard AMC-20
(optional Dana 44 with a 3.31)
Transfer case: Dana 300 2.62/1
Standard tires: P235/75R15 ( 29.0"x9.3" )
Performance: top speed 84 mph - theoretical
Fuel consumption and mileage:
EPA MPG Fuel Economy: 16/city 17/combined 20/highway
Aside from the "base package" Jeep CJ was offered with various equipment packages:
* Golden Eagle (1976-1979)
- Included: tachometer, radio, removable carpet, side steps, power disk brakes, power steering, 304ciV8, AC
* Renegade (1976 through 1986)
- Included: Same as Golden Eagle plus Levi Denim interior, rear step bumper, clock, sport steering wheel
* Laredo (1982-1986)
- Adds: Chrome package (grill, bumpers, mirrors, hinges, latches, side protector pipes, 15x8 chrome wheels),
swing-away spare tire carrier
The Laredo was offered by the American Motors Corporation (AMC) from 1982 through 1986.
Although Woody's Jeep CJ7 came dressed as a Laredo model
we don't believe it started its life that way but that
those adds were made over the years.
Woody is not a fan of chrome so likely, over the years,
it will likely shed the flash to become a standard Jeep again.
* Jamboree (built only for 30th Jeep Anniversary)
Over the 10-years the CJ7 was in production (1976-1986)
Wikipedia reported that about 380,000 were built.
As first received, the outside:
The off-color doors have since been sold on Craigs List.
A few months later still unrestored:
The oversized BF Goodrich All-Terrain T/A
tires (below) provide stability in almost all types of driving.
These same tires had come standard on the Hummer H2 line for good reason
The front axles are equipped with OEM Warn 28751 series manual locking hubs.
Buckshot Gumbo Mudder Tire Sizes
as seen on my old 1978 CJ5
GATEWAY BUCKSHOT WIDE MUDDER M&S Tires
Woody is not so much a fan of wide and tall tires.
They sometimes may have a tendency to ride up atop of the snow or mud.
When this happens, they can spin without traction.
To this end, Woody prefers narrow and tall tires.
It seems to be easier for them to cut down through the snow and mud to perhaps find traction below.
Woody has replaced the BF Goodrich All-Terrain T/A tires (cited above) with
Gateway Buckshot Wide Mudder N78-15LT bias-ply M&S tires.
Above Left: The 1984 Jeep CJ7 with BF Goodrich All-Terrain T/A tires on wide rims.
Above Right: The 1984 Jeep CJ7 with Gateway Buckshot Wide Mudder N78-15LT tires on standard Jeep rims.
Let's be upfront and clear about one thing:
This tires are Loud.
They "Sing" on dry pavement as the air gets
trapped, compressed and pushed out the sides and back.
These are Not tires for "city driving" unless you are willing to appreciate the noise they make.
They are noisy. Period.
The less-aggressive tread patterns found in the All-Terrain T/A type tires are much more normal for most applications.
These four tires were purchased on a Wednesday from Troy at
Via FedEx they arrived the following Saturday afternoon
and stacked by the driver next to the garage door.
Below is what I found as he was backing out the driveway.
Price for four (including delivery!) was us$716.00
When the Jeep CJ-7 was new, the originally equipped tires were
P235/75r15 like the one (below) leaning next to the Buckshot N78-15.
These tires are about the same width as the originals, just taller.
As originally equipped the stock rims were 15x7 inches.
The N78-15 tires on this CJ-7 are also mounted on original sized 15x7 rims.
Here are close-ups of the Gateway Buckshot Wide Mudder M&S N78-15LT tire.
N78-15LT Approved Rim 7x15JJ
6 ply-rating Load Range C
Max Load 1920 lbs at Max Inflation 45 PSI Cold
4 ply nylon cord DOT 6n
These are rough bias-ply tires, not suitable for those who like luxury.
One tire was 17-ounces heavier in one spot than other places on the tire.
It can be difficult to obtain a perfect balance on these tires so expect that.
For those who have grown used to the fat tires, they will initially look odd.
Remember that "in the old days" your great-great-grandfather required quality well-functioning tires.
This was much more important than being showy in the high-school parking lot.
Above: 1953 M38A-1 deployed during the Korean Conflict
Below left: Woody's 1978 CJ5 with (then named) Gumbo Mudder N78-15 tires
Below right: Woody's (current) 1984 CJ7 with (now named) Gateway Buckshot Wide Mudder N78-15 tires
CLICK for Gauge Information
The engine and running gear:
The power plant for this Jeep is a 2-barrel (Carter) carbureted OHV
AMC 258.4 cubic-inch (4.24 liter) 112-hp in-line six-cylinder engine
- A Dana 300 transfer case (1980-1986)
The stock (red with 35-teeth) speedometer gear had to be replaced due to larger tires being added.
See below for calculating the correct number of teeth
- Five-Speed Borg-Warner T-5 transmission with fifth-gear overdrive (1982-1986)
A Dana 30 was always used on the front axle
Axle ratios on the front and back on this Jeep are indicated to be 3.31:1
The "normal" gearing would have been 2.72, 3.55 or 3.73.
The CJ Dana 30
Ring Gear measures 7.12 inches (181 mm)
OEM Inner axle shaft spline count: 27 - (A 30-spline conversation kit may be available)
up to 2770 lbs.
Model/Version Spring Pads Wheel to Wheel Years
Dana 30/CJ Narrow Track 28" 53" '72-'81
Dana 30/CJ Wide Track 28" 56" '82-'86
(The Dana 44, with a 30-spline
shaft, was used after the CJ line was replaced)
FRONT AXLE HUBS
The front axles on this 1984 CJ7 came equipped with five-bolt disk brake-hubs and
OEM Warn 28751 series five-bolt manual locking hubs.
Used in later
There is a good article about Hubs at http://www.jeeptech.com/axle/hubs.html
According to the above web page basically: :
What are Six Bolt Hubs?
The term "six bolt hubs" often causes a bit of confusion
since all CJs, YJs, and TJs used wheels with 5 lugs.
There are two styles of brake hubs, however,
used on CJs between '72-'86.
From '72-'80 Jeep used a brake hub (for a 5 lug wheel)
that had 6-bolts to hold on the lock-out hub
from '81-'86 Jeep used brake hubs (for a 5 lug wheel)
with 5-bolts to hold on the lock-out hub.
There are limited selections of lock-out hubs available
that work on the newer 5-bolt setups.
Another concern is that those OEM 5-bolt lock-outs are fairly weak.
For this reason many people choose to swap out the
less-desirable 5-bolt brake hubs
for the more-preferred 6-bolt brake hubs
and the upgrade to the 6-bolt lock-out hubs
on their later 1981 through 1986 CJs.
Woody has purchased some used equipment with the interest of making this conversation.
Watch this page for updates on this issue.
These parts came from a 1975 CJ5 equipped with Drum Brakes (no disk brakes) on a Dana-30 front axle.
Since Woody's newer 1984 CJ7 has disk brakes, we'll see how this unfolds.
If the conversion to a six-bolt lockout hub works this will be pretty cool.
Watch this page for updates on this issue.
Keeping our fingers crossed.
IF YOU HAVE ANY EXPERIENCE MAKING THIS CONVERSION
WOODY WOULD LOVE TO HEAR FROM YOU.
Please email Woody by Clicking Here
I have found good references and discussion at:
Which partially reads:
"All Dana 30s from 1972-1980 use a six bolt locking hub.
From '72-'78 the factory had Warn Premium hubs as an option.
From '79-'80 the factory used Warn non-premium hubs stock.
From 1981-1986 they use a weak Warn five bolt locking hub stock.
Outer parts (knuckles out) can be switched among to different versions of the CJ Dana 30.
This means CJs with drum brakes can upgrade to disk and
CJs with cheesy 5 bolt locking hubs can upgrade to 6 bolt locking hubs.
Later (non-CJ) models use different knuckles and ball joints that are not compatible to the CJ Dana 30. "
A page telling step-by-step HOW TO replace the front axle parts was found at:
FOR INFORMATION ABOUT THE WARN HUBS
AND CONVERTING FROM FIVE-to-SIX BOLTS,
CLICK HERE or on the picture of the Warn Pamplet (below)!
Identifying the gear ratio of an AMC 20 can be a bit tricky.
These have 29-spline shafts.
Dana axles normally have a tag on the left of the diff cover with the gear ratio at the time of build.
The AMC axles have a code that has to be looked up in a table.
The code is stamped on the housing boss to the left of the diff cover right near the axle tube.
Good part about the stamp is it tends to stay readable longer than the tag,
but you have to know the code.
Since there are conflicts between what a code means for a narrow track and
what it means for a wide track, don't count solely on the code to identify an axle.
Bring a tape measure or know the source of the part.
|Narrow Track AMC 20|
|Code||Gear Ratio||Diff Type|
|Wide Track AMC 20|
|Code||Gear Ratio||Diff Type|
DUE TO INSTALLATION OF LARGER-DIAMETER TIRES
The original standard tires were P235/75R15 ( 29.0"x9.3" )
The tires are currently BF Goodrich All Terrain T/A
This had impacted the Speedometer
|FASTER THAN DISPLAYED|
Tire Sizes Cause Speedometer to read incorrectly
FROM THE WEBPAGE AT:
There is a possibly helpful chart at:
( TIRES: Original Tires measured: 29.0"x9.3" Current tires measured: 33.0x12.5 )
Our gear was originally found to have 35-teeth
To make the speedometer track more accurately after adding larger tires,
the speedometer gear needs fewer teeth.
Subtraction of one tooth increases the speedometer reading by about 3%.
If the calculations come up needing a half a tooth,
then have it read 1.5% faster rather than slower
to reduce the risk of speeding tickets.
Speedometer reads 45 MPH but GPS reads 60 MPH
(35 - 1) 34 tooth (45mph x 1.03) = 46.35 MPH
(34 - 1) 33 tooth (46.35 x 1.03) = 47.74
(33 - 1) 32 tooth (47.74 x 1.03) = 49.17
(32 - 1) 31 tooth (49.17 x 1.03) = 50.65
(31 - 1) 30 tooth (50.65 x 1.03) = 52.17
(30 - 1) 29 tooth (52.17 x 1.03) = 53.74
(29 - 1) 28 tooth (53.74 x 1.03) = 55.35
(28 - 1) 27 tooth (55.35 x 1.03) = 57.01
(27 - 1) 26 tooth (57.01 x 1.03) = 58.72
(26 - 1) 25 tooth (58.72 x 1.03) = 60.48
THE WEBPAGE AT:
X = Speedometer reading / GPS reading
0.75 = 45 mph (Speedometer-reading) / 60 (GPS-reading)
New gear tooth count = X * current tooth count
26.25 = 0.75 (from above) * 35 (current tooth count)
I had ordered and installed from Quadratec
a $40 26-tooth speedometer gear (plus the $1.50 O-Ring)
This has now corrected the speedometer to read pretty accurately,
based on both the GPS and also to another vehicle tracking behind me.
So -- both of the formulas cited above really seem to work well.
Fuses - Electrical
OTHER CJ7 RELATED LINKS:
Jeep CJs and the Difference Between Them
Automobile-Catalog.com Laredo Info
Woody's previous Jeeps
On a cold and snowy January 22, 1977 Woody purchased his first Jeep.
It was a five-year-old Robin's Egg Blue 1972 CJ5 that had originally lived in Holt, Michigan.
The 258 cubic-inch (4.2 Liter) six-cylinder engine and three-speed transmission had
21,545 miles on it when Woody took ownership of it.
On that day he filled up the gas tank paying 55.9-cents per gallon.
It was a simple vehicle as the only options it had was
soft top, the rear seat and Warn Lock-O-Matic hubs.
The biggest issue with this vehicle was that it
had already heavily eaten by Michigan rust.
During the time he owned it, Woody averaged about 12.8 MPG overall
( Woody has no known photos of his actual Jeep.
The one pictured above, although older, is similar in color and look but minus the rust)
Bought new for $5250 plus tax and with 22 test-driven miles on it
from the AMC/Jeep dealership near
Reynold's Field Airport at Jackson, Michigan on June 22, 1978.
It had the six-cylinder 258 cubic-inch (4.2 Liter) engine matched to the three-speed transmission.
The only options it came with was the canvas top, the roll-bar and the rear seat.
Woody filled up the gas tank that day paying 64.9-cents per gallon.
It did really well both on the highway and on back mountain trails.
It was set it up with Gateway Tire N78-15 "Gumbo Mudder" bias-ply tires
on the standard Jeep rims
so they were taller without any extra width.
Woody averaged about 14.5 MPG / city and 18 MPG / highway
with a few times up to 23 MPG
Unfortunately it was traded-in for a new
4x4 pickup truck and cabover camper ("house truck") in 1984
so the family could have mountain sleepovers.
In June 1986 Woody bought this Jeep with a defective crankshaft for about $600.
He didn't get the motor running until March 1987
and when he filled the fuel tank for the first time
he paid 76.9-cents per gallon for the gas.
After repairing the motor, adding a top
and then an original military-issued gas-fired furnace
it was somewhat warm to drive in the winter.
He used it as his commuter car for several months
but a total engine/transmission teardown was indicated
and it was sold after driving it only about 6500 miles.
Aside from all else, a mountain-capable Jeep was really preferred.
With its small four-cylinder engine, it struggled to make even the slightest hill.
We are glad to report that the man who bought it from Woody did restore it:
completely rebuilding all the running gear and
repainting it back to its original military glory.
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All personal comments, pictures copyright 1996-2013 - R. Linwood (4L RANCH)
Since 23 April, 2013