96 GMC Suburban 4x4, reverse pop out

[KPKSN]

When I go in reverse under load in 2wd, trans pops out of gear. I have not tried it in 4wd. Under idle it backs fine. Forward gears, all is well. Any ideas?

[ken_man_1]

When it "pops out of gear", what does it do? Does it slip out of gear, then go back into gear when rpm's go down - or does the gear shifter move - or ?

[KPKSN]

It would pop out of gear and make a high pitched grind sound. I would, quickly, put it neutral and wait a few seconds for it to wind down. I found out it was simply a broken rear snap ring. The OEM equipment was thin. The replacement is much thicker. I had local guys tell me it was electrical, linkage, "sunshield gear" and the best of all, TOTAL REBUILD. The luck of the Irish and $190 later we have reverse. Thanks for your interest.