What Is This? Came out of sure grip third member.

Rhloberger · 2025-09-29T17:00:16-0500

Was dropping my third member to change gear ratios, (489 case, sure grip) While wiggling the case to try to clear the mufflers this fell to the floor. Any idea what it is and where it goes? Covered in gear oil so it did come out of the pumpkin. It is not threaded.

Thx in advance.

69Bee · 2025-09-29T17:13:09-0500

Thrust button; takes up the endplay between axles. There are two in the assembly.

Rhloberger · 2025-09-29T17:44:38-0500

69Bee said:
Thrust button; takes up the endplay between axles. There are two in the assembly.

Thank you sir, looking at the sure grip assembly I can see where they go now. Unfortunately I have the unit completely unassembled and ready for the new bearings and gears but I did not find a second one, and it is not lodged inside the unit. Since this one fell out with the assembly it is likely this one was not in place either. Do you know where I source these?
Thanks again.

69Bee · 2025-09-29T17:48:57-0500

Does the axle have "Green Axle Bearings" on the axles? If so, the thrust buttons are removed for them. If the axle bearings are original tapered bearings with an adjustor on one side to adjust endplay, they are required to be there.

Rhloberger · 2025-09-29T17:49:18-0500

I see them listed now on ebay,
Thx.

BLK 68 R/T · 2025-09-29T17:50:58-0500

Rhloberger said:
Thank you sir, looking at the sure grip assembly I can see where they go now. Unfortunately I have the unit completely unassembled and ready for the new bearings and gears but I did not find a second one, and it is not lodged inside the unit. Since this one fell out with the assembly it is likely this one was not in place either. Do you know where I source these?
Thanks again.

Look inside of your axle tube. It might be in there if it fell off.

Vaanth · 2025-09-29T17:58:34-0500

Rhloberger said:
Was dropping my third member to change gear ratios, (489 case, sure grip) While wiggling the case to try to clear the mufflers this fell to the floor. Any idea what it is and where it goes? Covered in gear oil so it did come out of the pumpkin. It is not threaded.

Thx in advance.

View attachment 1925412

View attachment 1925413

View attachment 1925414

The pictured item is one third of the thrust block, or spacer, set. As noted, it is to take axle side thrust and mounts in the pinion shaft of a Powr Lok differential in the 8-3/4" rear axle.

Two similar looking pieces are held together by a pin as shown in the following image:

After the halves are inserted in the pinion shaft, and the pin placed in the halves, the end of the pin is peened to hold the spacer halves. The pin can lose its grip and the spacer halves can fall out when the axles are removed.

The original set part number is 2881313, but is discontinued at Chrysler. The following image shows the original 2881313 instructions:

The Dana Spicer part number is 26386X, but is apparently discontinued too. It might be found still in stock at a Spicer distributor.

Yukon Gear & Axle has the part at: YSPXP-062

Rhloberger · 2025-09-29T18:16:12-0500

How do you identify Green Axel Bearings? I see no color on them but they are not tapered. There does appear to be an adjusting ring on the passenger side axel only, found the second thrust button by feeling around in the third member housing.

69Bee · 2025-09-29T18:18:58-0500

Mopar Green Bearings for 8 3/4" (8.75) and Dana 60

Rhloberger · 2025-09-29T19:30:32-0500

What Is This? Came out of sure grip third member.

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