i have the rockstomper motor mounts and they do make the cab vibrate alot more than the stock motor mounts.  it was really bad in the cab but once i hade the whole inside of the cab sprayed with bedliner stuff it made a huge difference in the noise.





here is a chart of the transfercases and transmissions with years and chain or gear driven, i cant rememeber what forum i found it on.

Year Model Application Model Speeds Splines 1st Gear Engine Transfer Case
1979-1980 Carb     L43       4sp 21 spline 3.67 4cyl 20R       Gear driven  Top Shift
1981-1983 Carb     L45       4sp 21 spline 3.93 4cyl 22R       Gear driven  Top Shift
1981-1983 Carb     L50 & L52 5sp 21 spline 3.93 4cyl 22R     Gear driven  Top Shift
1984-1986 Carb     G52       5sp 21 spline 3.93 4cyl 22R       Gear driven  Forward Shift
1986-1988 Carb     G54       5sp 21 spline 3.93 4cyl 22R       Gear driven  Forward Shift
1986-1987 EFITurbo R151F     5sp 23 spline 4.31 4cyl 22RTE Gear driven  Forward Shift
1985-1988 EFI      W56       5sp 21 spline 3.95 4cyl 22R        Gear driven  Top Shift
1988-1991 EFI      R150F     5sp 23 spline 3.83 V6   3.0L       Chain driven Forward Shift
1989-1995 EFI      W56       5sp 21 spline 3.95 4cyl 22R        Gear driven  Forward Shift
1989-1995 EFI/ADD  G58       5sp 26 spline 3.93 4cyl 22R      Chain driven Forward Shift
1996-2002 EFI      W59       5sp 23 spline 3.95 4cyl 2.7L       Chain driven Top Shift
1996-2002 EFI      R150F     5sp 23 spline 3.83 V6   3.4L       Chain driven Forward Shift