Topic: Talk to me about axles (Read 20668 times)

Dutch · « **Reply #125 on:** February 09, 2012, 11:12:22 AM »

Quote from: V8 Bubba on February 08, 2012, 05:06:10 PM

amc 20 rear end you would prob spin a rear shaft or at worst twist the tube and pumkin but if you stay on 31s you will have no isues

Quote

and first spend on the rear should be one piece shafts (if it aint already got em)

So trying to understand the mechanics of a AMC 20 rear axle with reference to the above comment :
(and probably completely newby, lame ass questions so please don't blow my head off)

The pumpkin and the tubes are there to encase the cogs & shafts. I assume that the shafts are spinning freely
in the tubes so :

1) How could/would you twist an outer tube then if it is not a part of the drivetrain as such ?
2) One or two piece drive shaft ? That's the one that runs from the pumpkin to the wheel hub. As per below diagram how does that work ? are the two piece ones split in the middle or something ?

[attachment=1]

wildwood · « **Reply #126 on:** February 09, 2012, 11:29:48 AM »

I ain't no engineer but it would seem that under throttle the diff nose will rise wanting to cause axle tramp etc. the leafspring will want to hold the tube immobile and flat, the weak link is then the quality of the press fit or weld that joins the diff housing to tube....... and then twisty twisty tears!

The 2 piece shafts were probably a good idea to the bean counters but at the brake drum end the shaft goes thro the drum as a taper splined arrangement that is then held on by a nut

This is where the mayhem occurs and the splines get rogered and the shaft spins with no effect to forward motion.

I have seen King CJ stick welding this nut on site at Kirton to effect a repair...usually the only way anyway after a spline spinning escapade.

Hope this explains

jeepcj · « **Reply #127 on:** February 09, 2012, 11:56:19 AM »

Quote from: Dutch on February 09, 2012, 11:12:22 AM

So trying to understand the mechanics of a AMC 20 rear axle with reference to the above comment :
(and probably completely newby, lame ass questions so please don't blow my head off)

The pumpkin and the tubes are there to encase the cogs & shafts. I assume that the shafts are spinning freely
in the tubes so :

1) How could/would you twist an outer tube then if it is not a part of the drivetrain as such ?
2) One or two piece drive shaft ? That's the one that runs from the pumpkin to the wheel hub. As per below diagram how does that work ? are the two piece ones split in the middle or something ?

I have somewhere a 2 piece shaft thats been spun, but I cant find it . I would of put a pic of it on here. Basically the hub is separate from the axle shaft, it is held in place by a key way, and very fine splines/serrations on the axle shaft. This lot is then held in place by a nut torqued to 250 pound.
Its alright till it gets loose, then it will just spin. Make sure you check the nut every now and then. Its under the dust cover on the end of the axle, there will be a cotter pin as well.
Its similar to Dana 44 in the back of early CJs (pre 71).
The tube are very thin in those CJ 20 rear axles as well, you could bend the housing with some air time.

wildwood · « **Reply #128 on:** February 09, 2012, 11:59:20 AM »

I seem to remember also that the FSJ AMC 20 axle tubes are a lot stronger and I also think that just maybe although further research needed here that they are not two piece.

jeepcj · « **Reply #129 on:** February 09, 2012, 12:08:57 PM »

Quote from: wildwood on February 09, 2012, 11:59:20 AM

I seem to remember also that the FSJ AMC 20 axle tubes are a lot stronger and I also think that just maybe although further research needed here that they are not two piece.

I think your right, they are thicker tubes and 1 piece shafts, that would make them getting on for D60 strength?

Dutch · « **Reply #130 on:** February 09, 2012, 12:51:24 PM »

Thanks chaps,

A light starts slowly glowing in the dark

Like you said it all has to be made on a budget otherwise these (IMHO VITAL) components
should have been made from Kryptonite, unobtanium or some other indestructible metal and
welded shut.

Hence trying to put heavy goods vehicle axles under Jeeps to avoid the "POP" but then
somewhere else along the line something goes bang, as Willo amongt others has painfully experienced.

I'll just stick to polishing my rims I think

Bulldog67 · « **Reply #131 on:** February 09, 2012, 12:56:24 PM »

way way too much info dood

wildwood · « **Reply #132 on:** February 09, 2012, 01:15:34 PM »

Rim polishing

......................... reminds me of......................................

never mind.......................too early in the day

Nice girl tho

dieselj20 · « **Reply #133 on:** February 09, 2012, 10:51:51 PM »

fsj amc20 axles have a sort of two piece shaft instead of a nut on the end they are pressed together and welded

Bulldog67 · « **Reply #134 on:** February 12, 2012, 12:01:59 PM »

we may have already been here when lookin for upgrades for the Bastard (I believe i was advised not to go there for reasons that escape me)

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=370584955740&ssPageName=ADME:B:SS:GB:1123#ht_575wt_1185

willo · « **Reply #135 on:** February 12, 2012, 06:00:24 PM »

Quote from: Bulldog67 on February 12, 2012, 12:01:59 PM

we may have already been here when lookin for upgrades for the Bastard (I believe i was advised not to go there for reasons that escape me)

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=370584955740&ssPageName=ADME:B:SS:GB:1123#ht_575wt_1185

sealed hubs/uj's.......

Bubba · « **Reply #136 on:** February 12, 2012, 06:31:36 PM »

bingo

Delk · « **Reply #137 on:** February 13, 2012, 08:04:39 AM »

These would need to be narrowed down unless you wanted to go with full width

http://www.ebay.co.uk/itm/Dana-44-Front-Rear-axles-Jeep-4x4-off-road-/230744245214?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item35b96dc3de

wildwood · « **Reply #138 on:** February 13, 2012, 10:58:38 AM »

Full width.way to go............ stop you falling over

willo · « **Reply #139 on:** February 17, 2012, 11:16:15 PM »

Hmmm, Jana 54, anybody running these in the uk?

big_patrol · « **Reply #140 on:** February 17, 2012, 11:38:14 PM »

Never seen that before that looks like a nice way to go

Bulldog67 · « **Reply #141 on:** February 18, 2012, 12:00:59 PM »

hmmm, im intending a regear on all mine

Bulldog67 · « **Reply #142 on:** February 18, 2012, 09:12:31 PM »

and ............... thoughts from the tech heads?

dieselj20 · « **Reply #143 on:** February 18, 2012, 10:20:40 PM »

what ratio

Bubba · « **Reply #144 on:** February 19, 2012, 09:59:23 AM »

getting the funky stepped bearing could be a major problem if ever needed replacing

Bulldog67 · « **Reply #145 on:** February 19, 2012, 10:18:31 AM »

Quote from: dieselj20 on February 18, 2012, 10:20:40 PM

what ratio

4.88 for both full size on 35's, would allow scope for 37's altho I cant imagine when that would happen

4.56 for the 7

Quote from: V8 Bubba on February 19, 2012, 09:59:23 AM

getting the funky stepped bearing could be a major problem if ever needed replacing

that is a thort worth pursuin, presumably u coud get them to stick some spares in the parcel (?)

willo · « **Reply #146 on:** February 19, 2012, 10:32:57 AM »

Quote from: Bulldog67 on February 19, 2012, 10:18:31 AM

Quote from: dieselj20 on February 18, 2012, 10:20:40 PM
what ratio

4.88 for both full size on 35's, would allow scope for 37's altho I cant imagine when that would happen

4.56 for the 7

Quote from: V8 Bubba on February 19, 2012, 09:59:23 AM
getting the funky stepped bearing could be a major problem if ever needed replacing

that is a thort worth pursuin, presumably u coud get them to stick some spares in the parcel (?)

I thort I read that you make that bearing stepped, could be wrong tho'

Bulldog67 · « **Reply #147 on:** February 19, 2012, 10:34:23 AM »

any locker connected issues, as intending a rear in all 3 of the trucks

wildwood · « **Reply #148 on:** February 19, 2012, 10:44:33 AM »

Use lockrites............... cheaper and do the same as a Detroit. If I can't break one in a TJ 44 rear end with 35s in 10 years they must be sorta OK???

willo · « **Reply #149 on:** February 19, 2012, 10:46:15 AM »

Quote from: Bulldog67 on February 19, 2012, 10:34:23 AM

any locker connected issues, as intending a rear in all 3 of the trucks

How much pinot did you have? You got to use a 3.92 AND DOWN carrier, hence my murmurings of getting shot of my 3.92 and UP D44 ARB's

also re visit the thread, the Jana person replied to my noobie britwat question

Author Topic: Talk to me about axles (Read 20668 times)

dieselj20

Delk

big_patrol

dieselj20