Rear end or transmission problem. Need help

I recently did multiple jobs on my 05. I adjusted the bands on the transmission, being very careful to follow directions exactly as written. I also installed Wilwood brakes on the rear which required pulling the rear axles.

Now, the car will not move when in reverse. In the video, I show that with the transmission in neutral, the rear axle spins freely forwards by hand, and the driveshaft rotates. To rotate the axle in reverse, I need to use a wooden dowel for leverage, there’s a chunking sound from the rear end, and the driveshaft does not rotate with the trans in neutral. I have no clue what’s happening.


Any ideas?

That action appears to be related to the diff's TBR design & may be related to the question you presented concerning the flats position on the spyder gear\axle shaft in the other thread.
I'd remove it taking note of the orientation of those flats (if you haven't already) then reinstall it opposite of install & retest before going any further since the only thing you did to potentially create any operational change was that.

Hope this helps.

Id definitely be going over the diff and making sure everything is installed properly.

What do you have for a differential? Stock T-lock or something else?

If it is the stock T-lock, check to see if your spider gears and S-springs are all in place. Did the pin slide in smooth? Or was there some difficulty? Is one of the C-clips not all the way on the axle?

I did what Glasstop09 suggested to no avail. The sound I hear was coming from the backlash and the spider gears turning. You can see them in the video. I believe the diff is OK.
I went to front part of driveshaft. I can easily rotate it clockwise (forward) by hand with the transmission in neutral. As soon as I try to go counterclockwise (reverse ) I can feel the resistance of it not moving in the transmission.
I don’t get it. Of all the things I’ve done to this car, the band adjustment was actually pretty easy once I modified the tools to fit in the tight space. I can’t imagine what I fucked up.

What happens if you take the calipers off and try the same test?

Maybe something is different dimensionally between the wilwood backing plates and the stock ones pushing the axles further inboard than they should be.

Did that. Had both calipers and rotors off. Same result.
Going to redo bands tomorrow and see what happens.

I could always remove bolts from driveshaft at the diff to double check what turns and what doesn’t.

I'd do that before trying anything with the transmission.

The 1/R band doesn't get out of adjustment near like the 3/5 one does. How was yours? Was it close or did you have to turn it a bit?

What happens if you disconnect the drive shaft?


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This is my take, without researching powerflow of the trans.
Transmissions contain: one way sprag clutches, bands that hold and clutches that drive components. Engine off, there is no atf pressure, so all you have is sprags and bands.
Looks to me, you have a sprag holding the driveshaft from spinning in reverse. Which can only mean to me, is a band is too tight. Band adjustment is ususally torque to a spec and back off a certain amount.
On the video, when you are turning the left axle backwards with the stick, which way is the other axle moving? Is the driveshaft actually moving or are you fighting the diff clutches??

The driveshaft does not turn when turn the wheel backwards. The drivers wheel turns forward when I spin the passenger wheel backwards. The driveshaft does not move with spinning the wheel with stick. The driveshaft only turns in a clockwise (forward).
I torqued to 120 in/pounds and backed off 1.5 turns. I marked adjusting stud with paint to make sure I got turns correct.

I don’t remember how far I had to turn the adjustment studs it’s been a couple of weeks. There was a delay in the shipping of the brakes in February, since I had time, I decided to adjust transmission.
The rear adjustment stud is the one for reverse, correct?

Laga said:

The driveshaft does not turn when turn the wheel backwards. The drivers wheel turns forward when I spin the passenger wheel backwards. The driveshaft does not move with spinning the wheel with stick. The driveshaft only turns in a clockwise (forward).
I torqued to 120 in/pounds and backed off 1.5 turns. I marked adjusting stud with paint to make sure I got turns correct.

I don’t remember how far I had to turn the adjustment studs it’s been a couple of weeks. There was a delay in the shipping of the brakes in February, since I had time, I decided to adjust transmission.
The rear adjustment stud is the one for reverse, correct?

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I honestly dont know, that is why I said I did not research the powerflowof the trans. I never had one of these apart.
But since the driveshaft only turns forward, I would have to say it is a trans issue, and not diff.

I believe you’re correct.
Will recheck band adjustment. Maybe my HF 1/4” drive torque wrench is off.

Since you will recheck bands, I would losen the bands you adjusted, and try the test of spinning the axle again.

Was going to ask if I should do that.

I would disconnect drive shaft at diff as suggested, would narrow it down to either tranny or diff.

Rugermack said:

I would disconnect drive shaft at diff as suggested, would narrow it down to either tranny or diff.

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It’s the transmission. Going to loosen bands next.

Loosened the bands and nothing changed. Have to find transmission shop.

Laga said:

Loosened the bands and nothing changed. Have to find transmission shop.

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Did you remove the transmission range sensor when you adjusted the bands? (For better access, etc). If you did, I would make sure the range sensor is installed properly (you can find out how to align it via youtube). Our transmissions are electrically controlled and the range sensor adjustment is crucial.

I unplugged the range sensor, but did not remove it.

I was going to wait until I had a chance to test things out, but. I talked to CS at Level10 yesterday morning. He asked me to put things back together and since the car is on jacks, go through the gears in drive and see if it throws a code. He believes it’s a stuck sprag.
So I start putting on the wheels. I get to second wheel and it starts to spin in reverse. I had left car in neutral
The day before, I had loosened adjustment studs and tried to turn rear axle a couple of times without success. I re-torqued adjustment studs and tried multiple times again to move axle with no success. But it spins in reverse now. Sprag must have come free. Got busy and haven’t touched it since. Tomorrow, I need to torque down locking bolts on adjustment studs and see if things still work. I still plan on upgrading with Level10, but if the car rolls, I don’t have to do it now while in emergency mode. If I get it to roll, I still have to bed in new brakes and calibrate new crankshaft position sensor. I’ll post what happens tomorrow.