The Shop > Axle / Differential
Disconnect vs non disconnect. and Right Rear axle problem.
Paul Revere:
Had a quick question that came up after reading a few topics on this board.
I have 2.35 gears in my wagon, it's a 1985 with shift on the fly. It was my understanding that you can't flat tow an eagle because the Axles and shafts are turning all the time unlike a jeep yj where the front tires are free to spin without turning the axle. That and lack of N on the TC means you have to pull the driveshafts.
I keep seeing g people refer to a non disconnect vs a disconnect axle. does that mean some were equipped with a similar vacuum wheel disconnect like the YJ? or are people referring to something else.
I dont plan on changing my gears, my wagon is a highway machine so the mpg savings are paramount, I'm more looking at this from a breakdown perspective.
How can I tell which axle I have? and what will fit in each. is there a jeep/cj 2.35 carrier and gear combo still available that will fit.
I also keep seeing people mention the Right rear axle problem, can someone explain what that is? and how to do a preventative fix, or tell if someone's already fixed it. My eagle is going on a 12000 mile riadtrip. I dont want it to happen at the worst possible time.
MIPS:
My information on this was that originally Eagles had permanent 4WD, then they added SelectDrive for economy which added actuators at the transfer case and the front diff. This is what they call a disconnect axle.
Put a camera under the car you will see that in 2WD the front propeller shaft isn't spinning. The actuators are interlocked, so you have to stop the car and switch modes and let the diff engage/disengage before it will actuate the transfer case. I've found several actuators now from this era where the diff's actuator lightly seizes and it disables everything.
Then they switched to only one actuator at the transfer case so you could switch on the go but the front diff is always engaged.
I've had my vehicle towed several times (which isn't a proud thing to say) and even with the SelectDrive switched to 2WD they have to put dolly wheels under the rears because even if you leave the transmission in neutral and the TC disengaged there's a risk or ruining your viscous coupling.
--- Quote ---I also keep seeing people mention the Right rear axle problem, can someone explain what that is? and how to do a preventative fix, or tell if someone's already fixed it. My eagle is going on a 12000 mile roadtrip. I don't want it to happen at the worst possible time.
--- End quote ---
You mean the axle snapping at the wheel hub?
I had that happen last year. AMC 35 axle shafts are now out of production and the only good and safe fix is to replace the axle entirely with a Dana 35, which isn't a cheap solution. If you have another AMC 35 available, steal the symmetrical axle shaft out of the drivers side and in theory, you are less likely to have the shaft snap again. I don't entirely trust this solution myself.
I still can't find an official bulletin, when it started happening or when it was remedied but it seems to be a combination of an incorrectly factory torqued axle nut and I don't know if I stripped my splines out before it broke away completely but the splines in the hub were really shallow. It felt like the hubs originally didn't have splines and when the shaft and hub were combined and torqued the hardened shaft would cut its own splines. I guess that works, but if you overtorque the nut you will stress the shaft in the hub and if the hub ever slips on the splines you'll introduce radial stress on the already stressed area.
I can't think of a lot you can do once the damage is done. You could try cutting a keyway to reinforce against the hub wandering in the splines and retorque the nut a little lower. If you just weld the hub to the shaft you can't reach the bearings or shaft retainer. If you are going to pop the hub off to inspect I guess inspect the splines, look for torque yielding on the first three inches of the shaft and any obvious cracks.
Edited: I just double checked and the shaft IS already keyed and it STILL sheared. Yeah. I can't recommend anything else. There's a reason Dana changed it.
Paul Revere:
Thanks for the info!
Since I have shift on the fly I have the non disconnect version. so it seems jeep carriers will fit that casting.
D35s are relatively common at least, real matter will be findi g one with 2.35 gears.
Softbuster:
For the rear axle your best bet is to find a good used replacement shaft and hub from another AMC 15.
I doubt you will ever find a Dana 35 with 2.35 gears, unless the gear set from the AMC would swap over (not sure if anyone has ever looked into that) AMC sold the tooling for The 15 to Dana to become the 35, so who knows!
sifting through the whole front axle info on here you can find out that the 1984 and up front axles use a standard Jeep carrier for the 2.35 gears and there is hardly any way around putting other gears in there without A. a ring gear spacer (which is a terrible idea on a front axle in full time 4wd flying down the road)
Or B. find a front axle with the 2.73 - 3.54 carrier which is unique to the eagle as far as anyone has found.
If you wish to dive into the subject of finding another source for front axle carriers to find out if its truly a one off from Dana or if there is another vehicle out there that uses them that they can be sourced from. like Ranger/explorer Dakota/Durango Were there any 4wd Areostars? Or other oddball 4wd with the dana 30? Have fun!
I know where there is some AMC 15 shaft/hub assemblies in eastern Pennsylvania, if you wish to travel.
Best bet is to put out wanted ads here, on the AMC forum and social media / craigslist.
Paul Revere:
--- Quote from: Softbuster on May 08, 2022, 09:03:15 AM ---For the rear axle your best bet is to find a good used replacement shaft and hub from another AMC 15.
I doubt you will ever find a Dana 35 with 2.35 gears, unless the gear set from the AMC would swap over (not sure if anyone has ever looked into that) AMC sold the tooling for The 15 to Dana to become the 35, so who knows!
sifting through the whole front axle info on here you can find out that the 1984 and up front axles use a standard Jeep carrier for the 2.35 gears and there is hardly any way around putting other gears in there without A. a ring gear spacer (which is a terrible idea on a front axle in full time 4wd flying down the road)
Or B. find a front axle with the 2.73 - 3.54 carrier which is unique to the eagle as far as anyone has found.
If you wish to dive into the subject of finding another source for front axle carriers to find out if its truly a one off from Dana or if there is another vehicle out there that uses them that they can be sourced from. like Ranger/explorer Dakota/Durango Were there any 4wd Areostars? Or other oddball 4wd with the dana 30? Have fun!
I know where there is some AMC 15 shaft/hub assemblies in eastern Pennsylvania if you wish to travel.
Best bet is to put out wanted ads here, on the AMC forum and social media / craigslist.
--- End quote ---
I thought it went like this from what I've read on here
1. the 1980-1984 with the 2.35 d30 Casting was different than the 1980-1984 with the higher gear ratios, therefore if you have 2.35 in those years you need a whole front axle from a higher gear eagle to get any gear above 2.35.
2. 1985-1988 used the same d30 casting regardless of gearing so you can swap in a higher gear ratio with a new jeep carrier into it, because they got rid of the vacuum motor assembly to enable shift on the fly, so all the axles were the same non-disconnect axle.
THanks for the tip on the Axle shafts! I can always get them shipped if I need.
Navigation
[0] Message Index
[#] Next page
Go to full version