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10-14-2009, 07:55 PM
|  | Keyboard Implanted | | Join Date: Jan 2002 Location: Chapel Hill, NC
Posts: 3,762
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I'm still running the 33/12.50 LTB's on my 30 (3.55 ratio). Lunchbox locker and alloys with 297x joints (eliminated the axle disco and went with TJ shafts). I've killed joints and now having issues with ball joints... but shafts and gears have not been an issue.
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11-01-2009, 06:31 PM
| | Newbie | | Join Date: Sep 2009 Location: pennsylvania
Posts: 3
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I've been running 35x12.50 on my d30 w/4:10s and this summer I've broken 4 driver side axles at the joint but this was only after i welded the diff early this spring. When the diff was open i never had a problem. I'm currently looking for a d44 but I might try stronger shafts first only cause I have access to a lot of spare parts.
Think about what u want to do with your rig
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11-01-2009, 10:01 PM
| | Newbie | | Join Date: Oct 2009 Location: missouri
Posts: 4
| |  axels
does anyone no what gear ratio is on front and rear ends out of a 1978 or 79cj-7 and will they go into a 1975 cj-5 ok and any recomendations on how u like the amc20 rear end and dana 30 front end for just trail riding
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11-01-2009, 10:51 PM
|  | I Might Just Know What I'm Talking About | | Join Date: Sep 1999 Location: Owensboro, KY
Posts: 1,666
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Quote:
Originally Posted by hoosierdaddy  does anyone no what gear ratio is on front and rear ends out of a 1978 or 79cj-7 and will they go into a 1975 cj-5 ok and any recomendations on how u like the amc20 rear end and dana 30 front end for just trail riding | I'd bet the ratio is 3.55 or 3.73. The only sure way is to count the teeth.
The Dana 30 was in the front for the years you ask, but the AMC 20 was the rear in 78 and 79. Jeeptech.com's Jeep Axles Page
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11-02-2009, 06:45 AM
|  | Moderator | | Join Date: Dec 2001 Location: Belleville, Illinois
Posts: 9,616
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If it's still stock there's a metal tag under one of the cover bolts that will have the ratio and tooth count. If the ratio has been changed the mechanic should have left the tag off. In '78 I think the only choices for a 6-cylinder were 3:54 and 3:73. V8s might have had a 3:23 also.
You can put a mark on the driveshaft and tie a string to it. Then roll the Jeep exactly one turn of the wheels and see where the mark on the driveshaft is. If it's a half turn away from where it started it's a 3:54. If it's 3/4 past the starting point it's 3:73. A quarter turn past its a 3:23. If it's just a little past the starting point it's a 4:11 or a 3:08 and the string will tell which.
If you're careful you can figure it out that way, because there are only so many possibilities, but counting teeth is foolproof.
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