I have 4 R/C to reference all 4x4 no spacers under cross members. Years are 84,86 and two 85.

Must be a 2wd only than. Hey Bob can you check your 2wd and measure them if it has them? I think we should still is them for clearance even if its under an inch Mr Johnson.

my Johnson is over an inch!

And the spacers may indeed be a good plan. I did have the taller diesel style blocks installed in the rear, so the spacers would help correct the driveshaft angle.

I know the diesel truck crosmembers had a special spacer attached to the t-case mounting surface that is about an inch to help with driveline alignment.

So if I could find an inside diameter, and length. I can either buy some, or find some.

I have 1"OD and 0.50"ID aluminum readily available.

They are 5/8" tall

Never seen those spacers on a 4x4.

The cross-member is different between the 77 and 93. Going from the 727 to the 518 in a 77rc...used the 518 crossmember and reused 4 of the holes in the frame for each side(top&bottom.

The holes will be there since it had a 518 before...just a matter of using the right crossmember.

Are you using the JW ultrabell to adapt to the 440?

Yes he has the ultra bell. I think its been the same crossmember that it had with the 518 because the transfercase bolted to it as well.