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Old 05-05-2018, 02:25 PM   #1
Fl4t_Matt
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Exclamation Rear end locking up

Ok so my problem is for some reason the rear end of my 05 WRX seems to be locking as if the parking brake was pulled.

Recently my transmission blew so I got it rebuilt by a very reputable shop, AMCO Transmissions. And it is installed correctly with a brand new clutch and throwout bearing. For some reason now the rear end is locking as if the parking break was engaged. It starts to move forwards then locks and stalls out. We tried taking off the rotors to see if that was the case and no luck. It seems like the rear end just doesn't want to spin freely like it should, it spins its just very tough and locks after turning a few degrees. Ive had two different mechanics that I know look at it and neither one could find out what could be causing it.

If anyone has had this problem or any idea what it could be please let me know.
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Old 05-05-2018, 04:42 PM   #2
snake32
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I would disconnect the driveshaft on the rear differential and try to spin the rear tires, any chance they didn't match the FD on your car, did your car had the original transmission, could've been a mistake on the parts ordered to rebuild the trans.
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Old 05-05-2018, 11:52 PM   #3
Fl4t_Matt
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Quote:
Originally Posted by snake32 View Post
I would disconnect the driveshaft on the rear differential and try to spin the rear tires, any chance they didn't match the FD on your car, did your car had the original transmission, could've been a mistake on the parts ordered to rebuild the trans.
It could be but its the original trans, I doubt they would have made a mistake that crucial, they're a pretty reliable company. However I'll try that when I get a chance to see if its something wrong with that.
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Old 05-06-2018, 08:28 AM   #4
Charlie-III
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Quote:
Originally Posted by Fl4t_Matt View Post
It could be but its the original trans, I doubt they would have made a mistake that crucial, they're a pretty reliable company. However I'll try that when I get a chance to see if its something wrong with that.
AMCO, or AAMCO?
I have dealt with AAMCO before, not what I would call great, at least not 2 shops I have dealt with.
What was repaired? If they changed the front or center diff that could be your issue. Disconnecting the DS would be a good start.
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Old 05-06-2018, 02:45 PM   #5
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It would also depend on what type of damage was done to the rear diff when the transmission blew.
As suggested, if you pull the driveshaft, and the wheels still do not turn freely, then the problem is in your rear diff.

And, yes, I hope you are not referring to AAMCO. These places are horrible.
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Old 05-06-2018, 03:34 PM   #6
Fl4t_Matt
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Quote:
Originally Posted by Charlie-III View Post
AMCO, or AAMCO?
I have dealt with AAMCO before, not what I would call great, at least not 2 shops I have dealt with.
What was repaired? If they changed the front or center diff that could be your issue. Disconnecting the DS would be a good start.
Yes I believe it was AAMCO not AMCO and basically everything was rebuilt I do have an exact list somewhere here but according to them the trans was completely grenaded which was pretty accurate from what I could feel taking it off and messing with it a bit.

Last edited by Fl4t_Matt; 05-06-2018 at 04:03 PM.
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Old 05-06-2018, 04:02 PM   #7
Fl4t_Matt
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So just found out it was AAMCO and the rear end did turn freely once the driveshaft was disconnected so does that mean the trans is still dead?
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Old 05-06-2018, 07:17 PM   #8
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I got it, for some reason the rear caliper bolts the connect it to the hub were going in too far and catching the back of the rotors. Now to just figure out the reason it wont move in second.
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Old 05-07-2018, 07:07 AM   #9
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If you disconnected the driveshaft, and the wheels turned freely, then how could the rear caliper bolts be contacting the rear rotors preventing the wheels from turning? Your statements are contradicting each other.

The rear caliper bolts should not be able to contact the rear rotors at all.
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Old 05-07-2018, 08:44 AM   #10
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Quote:
Originally Posted by Samurai Jack View Post
If you disconnected the driveshaft, and the wheels turned freely, then how could the rear caliper bolts be contacting the rear rotors preventing the wheels from turning? Your statements are contradicting each other.

The rear caliper bolts should not be able to contact the rear rotors at all.
Maybe to disconnect the DS he removed the wheels? Thus the rotors are now floating on the studs.
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Old 05-21-2018, 09:32 PM   #11
Fl4t_Matt
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Quote:
Originally Posted by Samurai Jack View Post
If you disconnected the driveshaft, and the wheels turned freely, then how could the rear caliper bolts be contacting the rear rotors preventing the wheels from turning? Your statements are contradicting each other.

The rear caliper bolts should not be able to contact the rear rotors at all.
I really have no idea how it worked at all all I know was i loosened the rear caliper bolts and they spun, tightened them and they locked again, so I got some shorter bolts asI figured they might be pushing in the heat-shield or something idk...
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Old 05-27-2018, 09:59 AM   #12
Elbert Bass
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I don't buy your caliper bolt story either. Unless you had rear brake work done at the same time as the transmission repair there is NO reason for those bolts to have been removed and a longer bolt installed. You would have also had this issue before the transmission "repair".
I think they put a junkyard tranny in and got the wrong drive ratio.
Wouldn't be the first time they billed a rebuild and put in a junkyard transmission.

Had a customer in the late 1980s that AAMCO "rebuilt" her Mitsubishi KM175 (automatic with a 99% failure rate). Lasted 3 months. I had to explain to her lawyers what all that yellow writing was on the transmission and that it was obvious the transmission in her car had never been cracked open. Franchise owner also made the mistake of getting in my face in the shop where I worked. Neither event turned out well for him...
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Old 05-29-2018, 02:38 PM   #13
SleeperSubie
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I recently replaced the transmission in my OBXT and once I got the trans in I tried to back out of the garage and heard a big CLUNK.... It turns out that I ALSO smoked the pinion gear in the rear diff, ripped about 3/4 of the teeth right off....LOL $260 later and I had a low mileage JDM R160 shipped to my house.
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