DGB 4-Speed Automatic Transmission
EML Magnum" 5.9L Smpi V8
R1AZ is a trim code, Haven't been able to decipher these yet. Possible interior color.
QSB Bright Silver Metallic Clear Coat
PSB Bright Silver Metallic Clear Coat
APA Monotone Paint
CHE Deluxe Headliner
CGW Next Generation Front Air Bags
CBE Seat - 40/20/40 Split Bench
ASP Slt Decor Group
HGA Hood Insulation
HAA Air Conditioning
EML BR Engine - "Magnum" 5.9L Smpi V8
DHK Shift-On-The-Fly,231Hd Transfer Case
DGB 4-Speed Automatic Transmissions
CUE Rear Underseat Compartment Storage
K1X Black Molding Bodyside
NHM Speed Control
XBS Pickup Box

 

Thanks for the decoding there’s nothing on there regarding what differentials?

 

They are on the paper ID tag. You do not have the the DSA that would be a limited slip so yours is open.
DRB 9 1/4
DJC Dana 44
DMD 3.55
I thought all the options were on the metal tag but obviously not. You can get the full listing here but they don't give you the sales codes. We have a vin decoder here also.

 

Please keep in mind that the truck could have been modified by the prior owner(s) to add a limited slip unit to the rear. I've done this to my truck, as have other folks I know. The build sheet is a good starting point, but it's like Carfax - all of the modifications/repairs/upgrades may not have been reported..

 

I’ll keep that in mind I think I’m just gonna bite the bullet and not buy the clutches for the limited slip because they are relatively pricey compared to the other parts I have to buy. I’ll just have to go back in later and replace them should be there.

 

It's easy to check what diff type you have if you are doing a fluid change. Dome-shaped carrier with spider gears is an open diff, cylinder-shaped carrier with spider gears is a clutch-type limited slip, if it doesn't have spider gears it's a helical gear limited slip or a locker.

I would be wary about changing the bearings in a 9.25 if you don't need to. I had to send mine to a pro when re-gearing because I couldn't get the preload adjusters right, turns out I stripped one set of threads and I nearly destroyed the axle housing trying to get everything back together.

If you need Trac Lok style clutch packs I have some brand new ones I'll let go for $50 or a Powertrax drop-in locker for $300 if you're interested.

 

So today, I decided to put the rear up on jackstands and run it. I did hear the usual whine however, I did not hear the rubber squeak that I usually hear at take off I did also take a video of my driveshaft at the connection to the rear differential I just wanted to see if there was anything showing vibration or wobble

unfortunately, when I took it off the jackstands and drove it again the squeak came back so I don’t really know where it’s coming from other than I feel that it’s coming from the rear somewhere

https://www.dropbox.com/scl/fi/9y8ag...s4fcenhrg&dl=0

 

Check the u-joints. Good chance those will only make noise under load. Or, could put it up on jack stands again, hold the brake, put it in gear, then give it some gas, while still holding the brake.... release brake pressure slowly, see if you hear the noise.

 

So it turns out the recent issue was definitely the u joints on my rear driveshaft
We ended up replacing both the one at my rear differential was so bad that one bearing portion no longer had any bearing material in it. It basically disintegrated.


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