Same problem on our 321. Lubed all the seals, mechanism underneath, and slide rails on the ends but no help. Finally just started pulling in until I could see the slide floor rise up. Then went underneath, pulled down the seal flap along the bottom and shot in dry lube on the plastic ramp. Now quiet slide.
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]2018 Eagle 321RSTS-sold
2021 Pinnacle 36SSWS
2020 F350 CC LB DW 6.7
1973 IH 1210 CC
1975 IH Travelall
1979 IH Scout II
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