So i left my shifter into 2 second and floored my car, well first gear held on at 4500 RPM held for 4 seconds and then knock in really hard,if its on low load on 1 gear it shifts in very smooth, as if someone rear ended you, is this suppose to happen all other gears shift ok at high rpm....

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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi

I believe that is typical for an MB transmission. Hardness of shifts can be modified by changing the vacuum but I think the shift from 1-2 is always harder when accelerator is floored.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

That You're not being treated for whiplash!

1-2 upshift @ 4500 RPM Might jerk the car out from under the paint.

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'84 300SD sold
124.128