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Discussion Starter · #1 ·
Sorry guys, not a lot of hard data to go o here.

2003, in the 2XX mile range. Slowing down for a light and it very suddenly locked up the wheels and wouldn’t move in any gear. It was making some sort of drive shaft noises before this happened. This is a truck my ex drove, when he became the ex it became my backup truck and I know it needed some love but I just haven’t had the money to spread around to it.

Had it hauled to my dads, he jacked up the rear end. Back tires spin freely in both directions, driveshaft doesn’t move. We did disconnect batteries while waiting for tow truck just hoping it would reset something, so it shows no codes. Going to try to get a better code reader on it.

Dads race car mechanic says transmission. He does a lot of rear end work, gets called by other mechanics to consult, and overall is a Chevy gasser guy, not an Alison specialist or big on computers. Fluid is darker than I would have thought it should be, It was serviced at a reliable trans shop approx 1000 miles ago after an ex put it in limp mode then got about 10 mins into tearing apart the transmisssion so I wouldn’t take the truck. It was fine after the service for about 1 year and 1000 miles. I did not check fluid between then and now. Incidentally I haven’t been able to get it in 4wd since getting it back from ex but like I said, backup truck and it wasn’t needed.

Other than the noise that was sort of tied to drive shaft frequency, (like my 01 would be ready for U joints and carrier bearings noise) some slight vibrations but nothing shocking. No hard shifting, temp issues, no DIC warnings, etc. Shifter display on dash acts like it should.

Any other ideas of things to check before a transmission swap? Thanks for your help... your love and consideration much appreciated: I just got my 01 back from the shop with new injectors and 70 miles down the road had what looked like major white smoke catastrophe and died about 2 weeks ago. So I’m not doing real well, neither is my wallet! Lol.
 

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What exactly did the trans shop "service" to get it out of limp mode and what did your ex tear into? Pull the spin on filter and check the magnet for metal bits. Fluid looked like brown motor oil? or just dark red trans fluid?

No 4x4 could be transfer case related, transfer case sits between transmission and drive shaft. Check for fluid in the T-Case, could have had a pump rub leak that caused an internal grenade in the t-case.

As far as the rear tires spinning but the drive shaft remains locked, I'm not too familiar with the G80 rear end, but it may be a normal condition, I don't recall my drive shaft spinning when I change a rear tire without the parking brake engaged.

Good luck to you.
 

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Discussion Starter · #3 ·
What exactly did the trans shop "service" to get it out of limp mode and what did your ex tear into? Pull the spin on filter and check the magnet for metal bits. Fluid looked like brown motor oil? or just dark red trans fluid?
I think my ex just took off filters. Today I'm with the truck and not with the receipts, but service was replacing filters and new fluid. I've got a few pics of transmission fluid--I feel better about it than I did last night. I compared smell to a new bottle... it just smells MORE than the the bottle, same sort of oily mechanical smell as a new bottle.

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After taking off the filter and googling a little more, I feel like I probably should have handled the filter/magnet a little more. I touched everything and I couldn't feel any metal...

No 4x4 could be transfer case related, transfer case sits between transmission and drive shaft. Check for fluid in the T-Case, could have had a pump rub leak that caused an internal grenade in the t-case.x
I assume 4x4 is in the transfer case or in the selector in the dash. It's ok enough that it doesn't have 4x4, but I was wondering if transfer case could be the cause of the wheels not moving at all. From what I could tell the transfer case does have fluid. It looked like a dirty, clear fluid. It's full to right below the fill hole, and what I pulled out on the zip tie I stuck in was smooth, no slivers/chunks.

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I don't know what these look like under normal conditions, so anyone please let me know what you think.

We have tried out the truck shifting into Drive/Rev/Park etc. I usually feel the little normal shudder in the truck body which I always interpreted as the transmission moving into gear. One time it gave a little clunk the same as if I try to move the driveshaft.

I'm less sure about anything right now.
 

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Discussion Starter · #4 ·
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A few pics I forgot earlier... thought maybe things were sloppier than they should be in these pics but then I looked under another truck and I don’t really think so.

mileage on my truck is 217k.
 

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The bell housing is all wet, the T-Case drive shaft seal is wet and the shaft is pushed out a half inch. I would pull the trans and T-case after seeing that. Color of the fluid is not right, it looks silver/gray with red tint. It should be bright red. T-case should be running some type of Dex-III trans fluid as well.
Also, there is no magnet present on your trans filter, (unless you had already removed it), is a donut magnet that sits on top of that filter.

Best of luck in your fix.
 
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