stock amc20/dana30 regear for 33" - JeepForum.com

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post #1 of 24 Old 06-12-2013, 08:45 AM Thread Starter
smitty010203
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1981 CJ5 
 
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stock amc20/dana30 regear for 33"

Found a good deal for a 4" RC lift on Craigslist. Yes I said RC. Comes with the kit, steering stabilizer, pitman arm, brake lines. All brand new.

I am wondering if this is a bad idea as I would probably want to run some 33's

I258, Dana 30, Amc 20, T176, all stock as far as I know. (There are some metal sticks and plates that are down there now, someone once told me that was the stock "suspension". The leafs on it now look almost level.

Will I be miserable if go 4" with 33's and I dont regear? I take it there will be a noticeable difference. I cant afford to regear, bottom line. Should I avoid the lift and 33's?

Cant find a thread with all my matching characteristics on the internet anywhere about this. Lots of info, just couldnt find one for the 4 speed amc20dana30.


I will be looking to find out what gears my current axles are at lunch time.

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post #2 of 24 Old 06-12-2013, 09:05 AM
jp360cj
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Its going to depend on what gears you have currently. If its geared 3.31 or lower I would leave it alone and see how it works for you.

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #3 of 24 Old 06-12-2013, 10:07 AM
sanctified
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I have 2.73's and the PO put 32's and an SOA on it. I can get to 65 and do on a regular basis but that is the top limit. I do commute in my CJ and take the freeway, I just stay in the slow lane. In fourth im running 2100 rpms. I plan on regearing as money allows but have other things higher on the list.

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post #4 of 24 Old 06-12-2013, 10:34 AM
LumpyGrits
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4 speed and 33's work very well with 4:10's
5 speed, I'm run'n 4:88's and very happy with my 33" BFGs.
2:73 even with the stock little street tires was a mistake by AMC.
BTW, you don't need 4" lift to clear 33's......
LG
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post #5 of 24 Old 06-12-2013, 10:47 AM
Renegade82
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I'd tend to agree. I had 2.73's with the stock 29's, then 31's and 32's (and it $ucked w/32's) and then changed to 3.73's and now run 33's, which work fine but I don't have the highway speeds. I'd say the 4.10's are probably close to ideal for 33's.

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post #6 of 24 Old 06-12-2013, 11:46 AM Thread Starter
smitty010203
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yea im sure that 4" will be plenty for 33's I would go 34/5's's but I would think that would definitely put going with stock gearing out of the questions. I really didn't even want the 4" originally, its just $500 for the brand new springs, shocks, disconnects, brake lines, pitman, and stabilizer, and hardware.. thats why I feel like I need to jump on it..

I got some numbers off the back of the Dana 30, came back here and checked it out. apparently they aren't going to tell me anything though. look like i need to do the turn test or pull the cover off and look for numbers in there.
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post #7 of 24 Old 06-12-2013, 12:32 PM
Blutarsky
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Quote:
Originally Posted by LumpyGrits View Post
4 speed and 33's work very well with 4:10's
5 speed, I'm run'n 4:88's and very happy with my 33" BFGs.
2:73 even with the stock little street tires was a mistake by AMC.
BTW, you don't need 4" lift to clear 33's......
LG
How is it at highway speed with the 4 speed/33/4:10 setup?
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post #8 of 24 Old 06-12-2013, 12:46 PM
LumpyGrits
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Quote:
Originally Posted by Blutarsky View Post
How is it at highway speed with the 4 speed/33/4:10 setup?
About 2500rpms with the 4 speed at 65 mph. Don't forget that you will need to change the speedo drive gear in the t'case, so you show the correct speed.
OP, a 4" lift on a '5' will be scary in 'hard' turns and cross winds, BTDT....
LG
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post #9 of 24 Old 06-12-2013, 01:22 PM
Dadamsnv
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I agree on the regear to 4.10 for sure, but if you widened it out an 1" to 1.5" each side you'd get most of your stability back, and you won't rub tires on your springs.

Cheers!
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post #10 of 24 Old 06-12-2013, 01:35 PM Thread Starter
smitty010203
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I used to think "Just Empty Every Pocket" was kind of funny. Then I finally got a jeep. not so funny anymore.
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post #11 of 24 Old 06-12-2013, 01:36 PM
LumpyGrits
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Spacers on a '20' rear is a very bad idea. The axle bearing is to small to start with, and the axle tubes bend all the time in OEM forum.
Pretty much the same for the '30' and the spindle.
LG
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post #12 of 24 Old 06-12-2013, 01:37 PM
LumpyGrits
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Quote:
Originally Posted by smitty010203 View Post
I used to think "Just Empty Every Pocket" was kind of funny. Then I finally got a jeep. not so funny anymore.
AMC=All Most a Car...............
LG
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post #13 of 24 Old 06-12-2013, 02:14 PM
Dadamsnv
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Quote:
Originally Posted by LumpyGrits
Spacers on a '20' rear is a very bad idea. The axle bearing is to small to start with, and the axle tubes bend all the time in OEM forum.
Pretty much the same for the '30' and the spindle.
LG
Even with 33's??

Cheers!
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post #14 of 24 Old 06-12-2013, 02:16 PM
LumpyGrits
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33's are pretty big in load and weight so I will say YES.
YMMV,
LG
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post #15 of 24 Old 06-12-2013, 02:38 PM
agear
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Your ride maybe rough with that brand. If you have 2.73's you will not be happy with 33''s.

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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