Author Topic: Cracking between quarter panel and dutchman panel  (Read 894 times)

Offline brotow

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Cracking between quarter panel and dutchman panel
« on: February 23, 2018 - 03:02:54 pm »
Is there a good (easy) fix for preventing cracks between the quarter panel and the dutchman panel?   I noticed my 70 Challenger convertible started cracking on the drivers side, nothing on the passengers side (yet). Would welding a piece of steel under , inside the trunk across the seam, a good solution?  The car has torque boxes, sub frame connectors and front  inner fender and shock stiffener kit.  I'm just happy it's not painted yet.
« Last Edit: February 23, 2018 - 04:19:36 pm by brotow »
70 Chall. vert.(in process) - 73 Amx -74 Javelin- 87 Wrangler-02 Sebring conv.




Offline 1 Wild R/T

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Re: Crackinging between quarter panel and dutchman panel
« Reply #1 on: February 23, 2018 - 03:34:37 pm »
 :roflsmiley:  It was the "Easy" part that requires laughter....

 Been through this many times... Tried many fixes, sometimes on the same car, sometimes on on different cars, total of 11 cars & probably a total of 20 repairs....  Here's a few of them....

Tried welding it solid & regular filler, cracked within a few hours...

Tried welded solid & fiber reinforced (Kitty Hair) type filler, cracked within a month

Tried welded Solid & USC All Metal filler... Cracked within a month

Tried welded solid & cut a piece of 16 gauge steel to fit in the trough & welded it solid on both edges.... Then finished with regular filler.... Minor cracking after a year but better...

Tried welded solid & filled with lead, did it myself & I'm not the master of lead... Lasted a couple years but had minor cracking....

Had it leaded by an old timer who's been doing lead since the 50's.... Been that way for over 20 years & it's perfect....
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
5H21C  65 Falcon 2 dr Wagon... Dog Hauler...

Offline brotow

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Re: Cracking between quarter panel and dutchman panel
« Reply #2 on: February 24, 2018 - 12:30:07 pm »
I found  extremely poor welds. Unbelievable considering the car was owned by a very famous car customizer/builder.  Added a piece of metal  underneath  and welded the cracks.  Keeping my fingers crossed.
« Last Edit: February 24, 2018 - 05:51:11 pm by brotow »
70 Chall. vert.(in process) - 73 Amx -74 Javelin- 87 Wrangler-02 Sebring conv.

Offline 340challconvert

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Re: Crackinging between quarter panel and dutchman panel
« Reply #3 on: February 27, 2018 - 08:04:22 pm »
:roflsmiley:  It was the "Easy" part that requires laughter....

 Been through this many times... Tried many fixes, sometimes on the same car, sometimes on on different cars, total of 11 cars & probably a total of 20 repairs....  Here's a few of them....

Tried welding it solid & regular filler, cracked within a few hours...

Tried welded solid & fiber reinforced (Kitty Hair) type filler, cracked within a month

Tried welded Solid & USC All Metal filler... Cracked within a month

Tried welded solid & cut a piece of 16 gauge steel to fit in the trough & welded it solid on both edges.... Then finished with regular filler.... Minor cracking after a year but better...

Tried welded solid & filled with lead, did it myself & I'm not the master of lead... Lasted a couple years but had minor cracking....

Had it leaded by an old timer who's been doing lead since the 50's.... Been that way for over 20 years & it's perfect....

You have it right: have the area leaded by someone who knows how to do it and you are done!
I have a crack in same area of my A66 vert. i am looking to do what you recommend.
 :iagree:
1970 A66 340 Y-1 convertible

Offline 67vertman

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Re: Cracking between quarter panel and dutchman panel
« Reply #4 on: March 08, 2018 - 10:49:20 am »
This is how i did mine, "welded solid & cut a piece of 16 gauge steel to fit in the trough & welded it solid on both edges.... Then finished with regular filler" (I used all metal filler).... No cracking after five years, but I do have sub-frame connectors and torque boxes, which really help with the body flex. 



Ron - Born and raised in Southern California

I got the 1970 Cuda, but still need the hot blonde to ride shotgun!

First car -1969 Road Runner 383 4sp

Current ride - 1970 Barracuda 440-6 4 sp Dana 60  (4:10)