Justin Posted February 11, 2021 Report Share Posted February 11, 2021 Hey datto brudders, So 620's had short bed, extended-cab, long-bed, & extended-cab long-bed (and probably some other crazy shit that doesn't apply to me that I don't care about,). How much longer is an extended-cab frame than a normal shortbed (I'm assuming longbeds & extended cabs use the same frame, if that's wrong please let me know)? Thnx! Quote Link to comment
Preacher Posted February 11, 2021 Report Share Posted February 11, 2021 SB 169.2” LB 185” KC 178.7” These are the numbers for the overall length of each truck. There wasn’t a factory made KC long bed. Quote Link to comment
datzenmike Posted February 11, 2021 Report Share Posted February 11, 2021 This is the body length. Frames will be less. The ends of the frames might vary but the wheelbase does not. There are two different wheelbases but three trucks based on this. Regular cab short wheelbase 100.2" (between front and rear wheels) Regular cab long wheelbase 109.6" uses an extended box about 9.4" longer than the short wheelbase truck. King Cab long wheelbase..... 109.6" uses an extended cab which is about 9.4" longer than the regular cab and a short wheelbase box. There are 6 cab mounting points and 8 mounting points on the box. I can give you the distance from the very front to the very back mounting points. The King Cab and 'Long Box' extend past the rear most mounting points different lengths. The Long Box frame itself may extend farther so that the rear bumpers are properly positioned under the tail lights on the box. Quote Link to comment
Preacher Posted February 11, 2021 Report Share Posted February 11, 2021 Yes, the long bed frame does extend farther than the KC. Quote Link to comment
datzenmike Posted February 11, 2021 Report Share Posted February 11, 2021 I guessed as much having put a '78 king cab on a later '82 long bed frame. Wasn't sure as this was also 620 to 720 and there were bound to be differences anyway. Quote Link to comment
Justin Posted February 12, 2021 Author Report Share Posted February 12, 2021 Good stuff, 'preciate it! Quote Link to comment
EDM620 Posted February 15, 2021 Report Share Posted February 15, 2021 There are only 2 actual frame lengths with the regular cab short box being the shorter frame. The KC/short box and the regular cab/long box frames are the same length, only the 2 rear-most mounts for the cab are in a different position. All other body attachment points are the same. The 720 frame is largely unchanged but the tail of the frame is slightly longer to accommodate a rear bumper from the factory, plus an extra pair of mounting holes at the very front. Again, the body attachment points are unchanged - style is different but the geometry remains unchanged. I believe the D21/Hardbody chassis also retained the same body mounting points, but I don't know if anyone has confirmed that. If so, that would be a great way to update the running gear by 2 generations. Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.