The Dodge Challenger Message Board

on my car [72 challenger] i have a 429-cased 8 3/4 axel with inboard springs and the car is tubbed. ive tryed to put the springs back to the stock position but they now rub on the tyres .im thinking its the wrong axel and is to short? i want to put a suregrip / lsd diff in if as its spins one wheel alot with the 440. does anyone know where i can get and axel complete with diff ect and a rebuild kit [green type bearings and gaskits ect] thanks jamie

You mean 489 case?
More likely the wrong offset on the wheels. Too much backspace? Then again it could be from a charger or something.

I posted something once with the dimensions of the axles from model to model but can't find it now...

Axle and housing lengths are in this link.
http://www.moparts.org/Tech/Archive/axle/16.html

Like Dave said, you probably are going to need new wheels with a different offset. I think a fairly popular upgrade along with moving the springs in, is to install a B-body rear end. You may need to change that too. Lets hope you only need a pair of wheels.

hi dont relly want to change the wheels as they are fairly new, just looked though the last owners previous posts and he found out it was a b body axel . when the last owner put it up for sale he put "Rear is 429-cased 8 3/4 with open 2.91 gears..." so i wernt sure what rear end it had????. it looks pants with lowering blocks put on it so want to put the springs back in the original location so it lowers it.

Well "case" is the wrong word anyway. He must mean a 489 center section (pumpkin) with the gears in. Look on the "nose" of the diff on the left side behind the rear UJ. There will be a number cast there and the last three digits will tell you what type of center section it is. There were three main types. Two are strong and one weaker.

The housings are all the same and just different lengths (track widths).

I take it that when they have moved the springs inboard they have left the old spring perches in place? So you have two sets of spring perches?

Are you sure the outer set are in the correct location and everything lines up as it should?

yeah all the stock spring hanger points are still there just had to bolt the mounts back on the front, it all lines up perfect gona take it all off on the weekend and have a measure up might just get another ebody axel and lsd diff too ,connonball watts has a few for about 450 complete just will try a few options before i spend that sort of money as i need rear shocks too thanks for the info guys

its the wrong axle . the springs hit the drums when put in stock locations so need another axle as the lowering blocks broke this weekend and nakard the axle case. found a complete dana axle for £200 are they anygood???

Probably a truck dana at that price. Steer clear of dana's unless you plan more than 550hp with the auto. Otherwise you are just adding weight for no reason.

ok its come from a 72 challanger he has another but its bolted to his rolling chassis. been looking and they are heavy and need more power to turn. im nakard now have a car with a broken and wrong axle guess its going to have to be a £500 cannonball watts axle then

If it had been my car (and it nearly was) I would be trying to find a good case only. Then source a couple of half shafts (or buy new) and build the axle with the parts from the old. Maybe slip some 3.23:1 gears in there while I was on? But that would put the cost up.

hi dave thanks for the info ,that would be the best way then i know i have a nice rebuilt rear end. the rest of the car is spot on now just the bootlid left to paint and some new bumpers then its done. the rear end was the main thing letting it down really pulls like a train.will post some new pics when its done.never thought i could afford a challenger and been my dream car. wish i brought it stright from the mopar site instead of ebay.cost me £10200 in the end pxed my 69 green coupe thanks again jamie

Any of these work?

http://www.moparuk.com/forums/viewtopic ... 746#403746

Keep in mind that the spring mounts can be bought new and welded on where you need.

hi cars now sorted thanks to dunc, got a axle from him and its now perfect .thanks for all your help dave and adrian. will bring it along to the mopar meet at brooklands as ive never been there for a car show should be painted and with its red rt stripes down the side cheers jamie