Recently had our transmission serviced at the dealer. Just regular “preventative” maintenance, they dropped Pan, replaced fluid and filter. Everything was working fine prior to service (famous last words).

After the service, initially, it was slow to shift into fwd or reverse. That has since become more “normal”. And it still drives and shifts good, other than a whine/gear noise.

While driving up camping last week, started getting a gear whine and vibration. Almost felt like 4wd was engaged, but we verified that wasn’t the case.

Went to the shop today and we drove around and it seems like when the OD is turned off, it grinds/whines while slowing down, worse than when driving with OD on. And also just driving normally, the whine is noticeable around 25-30mph and higher. This leads me to a few questions...

1. I’ve read about the OD snap ring failing, wondering if this sounds like symptoms of that. Also wondering if this is something that can be repaired or if I’m looking at a new transmission.

2. Any Trans shops in the Sacramento area that are recommended? John Woods is closed until Sept 7, and BTS isn’t shipping till Mid October... can’t wait that long.

3. Looking at DieselSite, but any other recommended 4r100 replacements for a slight power tune (60-80hp), 35” x12.5 tires and we pull a 11k trailer. Otherwise it’s just the family vehicle.

thanks!!

 

No expert, but is it possible the filter came loose?

 

Might be worth taking it back to the shop that did the flush/PM whatever, make them feel guilty.

I'm new to Sackatomato myself so no trans shop recommendation, but call Imler Diesel. They have a sterling rep for diesel trucks and surely can make a tranny shop recommendation.

 

Do you know if they took the valve body off in the process of "servicing" the transmission? There are three bolts that I forget the name of right now that make the transmission run funny when they come loose. @Mark Kovalsky will know. In the meantime, the attached document might help.

 

That is my best guess.

 

Could it be u-joints or rear end? Possibly even the tcase?

 

That's possible,

 

Honestly vibration or whine or whatever you call it. Usually the indicator of rear driveshaft u-joints or rear end problems or even rear end fluid level, is the change in noise on deceleration or acceleration. Usually decel or keeping a steady speed with slight changes to the throttle.
MY first start would make sure all your fluids are changed or topped off. Then leave it in 2wd, place a block or tire chock behind one of the front wheels. Place transmission in neutral and make sure there is no load on the drivetrain.

No parking brake,basically a static load and grab your rear driveshaft and twist it back and forth.

Start with the easy stuff like fluids 1st.

Good luck

 

I would remove the driveshaft to check the u-joints.