...and here are the quick and dirty conversions I'm using for vehicles. I compared most vehicles and came up with some good data... then threw most of it away and went with gut feelings

SR4 HANDLING==SR5 HANDLING
-2==3/*
-1==3/*
0==4/*
+1==4/*
+2==5/*
+3== 6/*
* for off-road values, -1 for most ground vehicles, +0 or +1 for ATV/4WD, -1/+1 for off-road specialty vehicles.
SPEED
SR4 SPEED)==SR5 SPEED
5==1
10==2
20=3
40=4
80=5
160=6
320=7
640=8
1280==9
2560==10
ACCELERATION
SR4 ACCEL(AFTER SLASH==SR5 ACCEL
0-20==1
21-40==2
41-80==3
81-160+==4
ARMOR
SR4 ARMOR==SR5 ARMOR
0==0
1==2
2==4
3==4
4==6
5==6
6+==1:1
SEATS
Refer to SR4 guidelines, pictures, and text descriptions (chart in SR4A and Deadly Waves)
All other stats I'm just using 1:1.