84 cj-7 w/ dana 60 front axle gm 14 bolt 10.5 "

Getting it only when you drop it into 4wd suggests this is an issue somewhere from the transfer box down to the front wheels. If you can Safely get under the vehicle, use a flashlight and check for any obvious damage like loose driveshaft linkages and rubbers.
You will also need to find out what that light is for. Your vehicle uses the older OBD1 system so the new OBD2 scanners may not read them.

Could be bolts or push in need prey bar.

www2.dana.com/pdf/5326.pdf
I believe you have a Dana 50 front axle. 2004 and up come with Dana 60. You can upgrade to the Dana 60 as a drop in.
http://www.ford-trucks.com/forums/1059204-dana-50-parts-breakdown.html

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go on web sit to dana transmissions/ differentials and see the technical division tab and go there for the identification of the diff.. The 603384-5 will be the code for the differential

Dana 50 Front Axle

Observe the following torques;

* Left and Right drive axles-to-cross member: 120-150 ft. lbs. (163-203 Nm)

* Axle arm-to-radius arm: 180-240 ft. lbs. (244-325 Nm)

* Coil spring insulator: 30-70 ft. lbs. (41-95 Nm)

* Upper spring retainer: 13-18 ft. lbs. (18-24 Nm)

-----------------------------------------------

Dana 60 Front Axle

Observe the following torques;

* Drive shaft-to-flange: 15-20 ft. lbs. (20-27 Nm)

* Track bar nut and bolt: 160-200 ft. lbs. (217-271 Nm)

* Stabilizer link nut: 20-30 ft. lbs. (27-41 Nm)

* Stabilizer barU-bolt: 50-65 ft. lbs. (68-88 Nm)

* Spindle connecting rod-to-knuckle: 70-100 ft. lbs. (95-136 Nm)

* Front spring U-bolt: 95-100 ft. lbs. (115-135)

① Step 1: 22 ft. lbs. Step 2: 59 ft. lbs. Step 3: Loosen completely then retorque to 22 ft. lbs. Step 4: 18-25 ft. lbs. Step 5: Plus 86-91 degrees ② 10-12 ft. lbs. plus 60-65 degrees or 28-33 ft. lbs. ③ The cylinder heads and the lower intake manifold are installed together Step 1: Tighten the cylinder head bolts to 22 ft. lbs. Step 2: Tighten the cylinder head bolts to 43 ft. lbs. Step 3: Loosen the cylinder head bolts completely Step 4: Tighten the cylinder head bolts to 84 inch lbs. Step 5: Tighten the intake manifold fasteners to 35 inch lbs. Step 6: Tighten the intake manifold fasteners to 13 ft. lbs. Step 7: Tighten the intake manifold fasteners to 12-14 ft. lbs. Step 8: Loosen all intake manifold fasteners completely Step 9: Tighten the cylinder head bolts to 22 ft. lbs. Step 10: Tighten the cylinder head bolts 60-65 degrees Step 11: Tighten the cylinder head sub-bolts to 80-105 inch lbs. Step 12: Tighten the intake manifold fasteners to 35 inch lbs. Step 13: Tighten the intake manifold fasteners to 78 inch lbs. Step 14: Tighten the intake manifold fasteners to 70-84 inch lbs. ④ 10-12 ft. lbs. +60-65 degrees ⑤ Step 1: 72 ft. lbs. Step 2: loosen completely to 0 ft. lbs. Step 3: 29 ft. lbs. Step 4: Plus 75 degrees clockwise Step 5: Plus 75 degrees clockwise ⑥ Step 1: bolts 11-22 19 ft. lbs. Step 2: bolts 1-10 29 ft. lbs. Step 3: bolts 1-10 Plus 60-65 degrees ⑦ Step 1: 20 ft. lbs. Step 2: loosen to 0 ft. lbs. Step 3: 14 ft. lbs. Step 4: Plus 85-95 degrees ⑧ Step 1: 31 ft. lbs. Step 2: Plus 60 degrees ⑨ 83 inch lbs. ⑩ Stud bolt: 11 ft. lbs. Nuts: 31 ft. lbs. ⑪ Step 1: 72 ft. lbs. Step 2: loosen completely to 0 ft. lbs. Step 3: 29 ft. lbs. Step 4: Plus 90 degrees clockwise Step 5: Plus 90 degrees clockwise ⑫ Bolts: 17-24 (M8) 16 ft. lbs. Install rear main seal Bolts: 1-16 (M10) 26 ft. lbs. Bolts: 1-16 (M10) Plus 90 degrees clockwise ⑬ Step 1: 33 ft. lbs. Step 2: Plus 84-90 degrees clockwise ⑭ Intake manifold collector: Bolts and nuts: 8 ft. lbs. Stud bolts: 61 inch lbs. ⑮ Intake manifold: Bolts and nuts: 5 ft. lbs. and than to 21 ft. lbs. Studs: 8 ft. lbs.

changing pinion seal on 79ford e-250 dana60.are there any cautions or recommendations concerning torque or preload.

Jeep Axle: AMC 20

Front Axles
Dana 44
Dana 30
Dana 27
Dana 25


Rear Axles
Chrysler 8.25"
Dana 35c
AMC 20
Dana 30
Dana 60
Dana 53
Dana 44
Timken
Dana 41
Dana 23


Jeep Axles
Upgrades
Factory Options
General


-->All AMC 20s have a 8 7/8" R&P and use a 29 spline shafts. The AMC 20 R&P is 3/8" bigger than the Dana 44, but it uses smaller shafts, smaller axle tubes, and the CJ version comes with weaker two piece shafts. The AMC20 uses a 29 spline shaft where as the later Dana 44 uses a 30 spline shaft. The AMC 20 housing tends to flex a lot which can cause breakage. This can be remedied by welding the tubes and/or adding gussets. The reason the AMC 20 flexes more than the Dana 44 is the shorter differential housing and smaller axle tubes. It's other flaw is the CJ version uses the two piece axle made up of a hub and a shaft. The hub end tends to break off under load which has created the market for one piece AMC 20 axle shafts. Unfortunately, the shafts are expensive ($350+ USD) and in some cases a special bearing must be used.
-->Identifying the gear ratio of an AMC 20 is a bit tricky. 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. Specs Narrow Track AMC 20 Code Gear Ratio Diff Type AA 2.73 Open DD 2.73 Trac-Lok BB 3.31 Open CC 3.31 Trac-Lok A 3.54 Open N 3.54 Trac-Lok GG 3.73 Open Q 3.73 Trac-Lok L 4.10 Open M 4.10 Trac-Lok Wide Track AMC 20 Code Gear Ratio Diff Type D 2.73 Open DD 2.73 Trac-Lok B 3.31 Open BB 3.31 Trac-Lok A 3.54 Open AA 3.54 Trac-Lok H 3.73 Open HH 3.73 Trac-Lok C 4.10 Open CC 4.10 Trac-LokThe Trac-Lok is a limited slip differential. You may have to scrape away a lot of mud, paint, and rust to uncover the code. If you can't find the code on the rear, check the tag on the front axle. Both axles should be geared the same. The R&P ratio ranges supported by the carriers are 2.73 and 3.31-5.13. The 5.13 gear ratio is not available for the Dana 30 though, so it is rare to see it. 4.56s are the lowest common ratio between the Dana 30 and AMC 20. 5.13s are available for the Dana 44.
CJ AMC 20 The CJs used two versions of the AMC 20, the narrow track from '76-'81 and the wide track from '82-'86. Both versions use keyed, two piece shaft/hub design and 5 on 5.5" wheel bolt pattern. Supplies of AMC 20s were exhausted in 1986 and some Dana 44s were used instead in the last of the CJ-7s.
From 1976-1978 a larger 11x2" drum brakes was used on the AMC 20. After 1978, a 10x1.75" drum was used.
SJ AMC 20 The Wagoneer and full size Cherokee also used a narrow and wide track version of the AMC 20. Both SJ versions used once piece shafts and 6 on 5.5" wheel bolt pattern. Since the length and bolt pattern is different from the CJ version, the SJ shafts are not compatible without resplining and redrilling. I've never heard of anyone going to the trouble.
Model/Version Spring Pads Wheel to Wheel Years AMC 20/CJ Narrow Track 36" 50.5" '76-'81 AMC 20/CJ Wide Track 36" 54.5" '82-'86 AMC 20/SJ Narrow Track AMC 20/SJ Wide Track Last modified Friday, 03-Dec-1999 21:48:34 MST
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Is the c/k 3500 4 wheel drive?If it is 4WD,you must retain the same gear ratios for both front and rear axles,or the transfer case will be damaged.If it is 2 wheel drive,you can install any gear you like.I believe the Ford E350 rear axle is a Dana 70,as i have rebuilt 2 of that model,along with Dana 60's.The Ford unit likely will not be a bolt in.It will probably require professionally welding new mount brackets on the Ford axle housing.The width needs to be measured from inside the brake backing plate to the other brake backing plate to see if it will physically fit.Good luck.