Question about 1990 Jeep Wrangler

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Dana 35 gear install

I bought the jeep with the spyder gears welded and i would like to remove this annoying thing. I would like to know if i need to change shims and recheck the back lash or can i just get a new carrier and replace it. I want to know what is involved in doing this thanks

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  • Jess n Jed T n B
    Jess n Jed T n B Jan 27, 2009

    Thanks Phil :)

  • Jess n Jed T n B
    Jess n Jed T n B Jan 27, 2009

    ok what would i need to check the back lash lol thanks again



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You can take the carrier out and replace it. When you pull it out, make sure that you count the shims, mark them for each side so you won't get them mixed up. But before you take the carrier out, check your ring gear backlash. Make sure you use LOCTITE on the bolts. Good luck. Phil

Posted on Jan 27, 2009


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I have a 1989 jeep comanche mj with a dana 35 rear axle. How does the axle shaft come out?

You have to remove the brake backing plate and then pull the shaft with a slide hammer.Or if the car was right on the changover the backing plate of the diff needs to come off.Push the axles in and remove the c shaped clip.DON'T let the pinion gears move..Hope this helps

May 11, 2011 | Jeep Comanche Cars & Trucks

2 Answers

How do you change out the Spider gears in a 1999 TJ with a Dana 35.

Jack up the vehicle and place jack stands under the reared. Remove tires and brake hubs. Then loosen bolts on diff cover and drain diff grease. Remove the cover. Rotate carrier until you locate the bolt that holds the rod in place and remove it and rod. Rotate the carrier until one of the small gears come around and remove it and the shim and rotate again to get the other small one and shim. Then on either side push the axle to the inside just enough to remove the c clip and then pull it out till it clears the bigger gear and remove that gear and shim. Repeat for the other side. Repeat process in reverse order to reassemble. Fill with grease until it runs out the fill hole. Install plug and test drive the jeep. About an hour job for a novice mechanic and a hundred bucks.

Feb 09, 2011 | 1999 Jeep Wrangler

1 Answer

I have a 2008 Jeep Wrangler X. The rear differential I believe is a Dana 44.I want to buy a Ricmond locker for the rear diff, but I dont know how many splines the axle is? Can you help me?

Generally you can find that out by showing the ID tag to a parts guy at a dealer. However...after being fooled several times by tags that were not from the original diff I was working on, I use the tried and true method of actually removing the axle and counting the splines.
Up-grading to a positraction rear is a good idea but one thing to remember is that you need to re-set all clearances properly or the gears will quickly self destruct. A cheaper and easier swap is to find a complete differential in a scrapyard and install the entire unit (complete) Then, your only concern is that you exactly match the gear ratio of the one you are replacing (again, don't rely on the tag...count the gear teeth on the ring gear and pinion gear.) Posi units are sometimes difficult to locate but if yours isn't broken, you have time to search.

Mar 01, 2010 | 2008 Jeep Wrangler

2 Answers

98 jeep wrangler rear diff dana 35

when you take the rear cover off of the differential housing you will see a whole bunch of small clutches between the spider gears and the ring gear housing, you will see that the axles go right through them. If it is not a limited slip it will not have these clutches

Jun 25, 2009 | 1998 Jeep Wrangler

2 Answers

Cj7 rear

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
Dana 41
Dana 23

Jeep Axles
Factory Options

-->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.
amc20co_.gif -->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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Jun 06, 2009 | 1985 Jeep CJ7

1 Answer

2000 jeep wrangler are sythetic lubes used in axils and trans

Hello grega1967, your Jeep Wrangler came from the factory with gear oil in the axles and manual transmission, but the transfer case uses transmission fluid. It is a NP231 and your axles are Dana 30 in the front and Dana 35 in the rear. They should have a 4.10 gear ratio due to you having a 2.5 liter 4 cylinder.

I hope this helps,


Mar 12, 2009 | 2000 Jeep Wrangler

1 Answer

Major bind in 4 wheel drive

Yuo deifinitely have to get rid of one differential to match the other. I would change the rear diff as the gearing in that one will give you really poor mileage... additionally welded spider gears (poor mans positraction) make cornering a nightmare (the outside wheel must turn faster than the inner one on turns, which is why no one uses "spool" type differentials on anything but drag race vehicles (because they only go in straight lines).
As far as which Dana unit you are supposed to have, YOU MUST MATCH THE EXACT GEAR RATIO TO THE FRONT UNIT or, it will destroy the transfer case!!! You could even modify a chevy or ford diff to fit under there, but the ratio match has to be exact!!! To find ratio, count the ring gear teeth and the pinion gear teeth. I don't remember the formula but you need to establish a ratio from these two #s.(divide the ring gear# by the pinion#??? answer is expressed as (answer:1 such as 3.23:1))

Feb 01, 2009 | 1984 Jeep CJ7

1 Answer


Different manufacturers, components don't interchange. (if your'e thinking of swapping gears on 4x4 exact gear ratio match must be maintained front and rear or you will destroy the transfer case!)

Jan 14, 2009 | 1984 Jeep Cherokee

4 Answers

Rear end (axle)

call jeep and give them last 9 digits of your vin and ask for three things -Differential Type,Gear ratio, and Track lock- They will give you
1) Dana 35 or 44
2) Gear Ratio 3.31 or 3.73
3) Track Lock - yes/no

Jan 11, 2009 | 1998 Jeep Grand Cherokee

1 Answer

I have a 2003 jeep tj sport wrangler, with a six cylinder, 5 speed standard trans wondering what size diffs are in it

You most likely have a Dana 30 front and a Dana 35 rear, unless you have the towing pkg. which would be evident by rear disc brakes and a rear center section that is almost stop sign shaped. The gearing in your Jeep can be determined by the tags on the diff covers but it is most likely that you have 3.07 gears unles you have the towing pkg. in which case you would have 3.73

Jul 27, 2008 | 1996 Jeep Grand Cherokee

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