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Old 10-22-2011, 08:04 AM
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1940 chevy truck frame

Hello fellow rodders!
pics here http://community.webshots.com/album/...munity&start=0
I have a 1940 chev truck that i'm going to hot rod up.
I have the frame in the garage and will clean it up this weekend. My helper(the boy) is raring to go LOL. Now my question is.... should i box in my frame? i did some post searching last night and the consensus is that the 30's trucks need the extra support but the 47-53's don't. i didn't find alot of info on the 40-46's. from the looks of the job the person who put the front clip in, did a good job. I can clean all of it up and MPI the welds(work at a vessel fab shop) to see if there is any cracks and such. If i do box it down to say just past the transmission mount, wouldn't that be a stress point and could lead to a crack or split? I'm just going to put a nice strong 350/700r4 setup in it. Nothing too radical. A nice street cruiser and it wont haul anything but maybe a beer cooler!
I just want to do it once. Thanks for your advice and opinions.
Barry

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Old 10-22-2011, 12:40 PM
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40 chevy p/u

Quote:
Originally Posted by probird
Hello fellow rodders!
pics here http://community.webshots.com/album/...munity&start=0
I have a 1940 chev truck that i'm going to hot rod up.
I have the frame in the garage and will clean it up this weekend. My helper(the boy) is raring to go LOL. Now my question is.... should i box in my frame? i did some post searching last night and the consensus is that the 30's trucks need the extra support but the 47-53's don't. i didn't find alot of info on the 40-46's. from the looks of the job the person who put the front clip in, did a good job. I can clean all of it up and MPI the welds(work at a vessel fab shop) to see if there is any cracks and such. If i do box it down to say just past the transmission mount, wouldn't that be a stress point and could lead to a crack or split? I'm just going to put a nice strong 350/700r4 setup in it. Nothing too radical. A nice street cruiser and it wont haul anything but maybe a beer cooler!
I just want to do it once. Thanks for your advice and opinions.
Barry
I would box it, you have a 70 year old frame, where it was grafted on, looks like it could use some help. you will have to put a crossmember in it. just for piece of mine, I would. then you said a strong 350, You had better look at doing the rear also. It is easy to do it now and over do it, than not do it and have something break and crashing on the highway.

Don't forget who is sitting in the other seat, because if he is going to help build it, he sure is going to want to ride in it.

Bob
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Old 11-02-2011, 12:19 PM
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I found a used good frame so i will scrap this one and put on a MII hub to hub front end.
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Old 11-02-2011, 12:31 PM
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40 chev frame

Quote:
Originally Posted by probird
I found a used good frame so i will scrap this one and put on a MII hub to hub front end.
The frame might be in better shape than the one you had, but it didn't get any younger, I would still box it.

Bob
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Old 11-02-2011, 01:02 PM
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Will do Bob.
This will give me a rad support and all of the mounting spots, where the one i have now i would have been guessing.
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Old 11-02-2011, 02:17 PM
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40 chev p/u

Quote:
Originally Posted by probird
Will do Bob.
This will give me a rad support and all of the mounting spots, where the one i have now i would have been guessing.
Good luck, and you have fun working with your son, I'm sure he will have a blast working on a Hot Rod.

I know you will.

Bob
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Old 11-11-2011, 09:09 PM
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I am doing a 41 Chevy truck. I boxed it, added a couple cross members and an x brace. Seems like a lot but once you are started, its just a few more days of fabrication.

My thinking was, the truck was designed to go about 35-40 mph, had something like 39 brake HP, and didnt pull a trailer. I have 300 hp, I want to go 70 mph and pull a trailer. With the extra power, the frame work, better brakes and a narrowed ford 9 inch, it should do just fine. I do still expect the crank out windshield to leak water on my left leg though.
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Old 11-12-2011, 09:31 AM
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HI! could you give me some more info on how you added an x brace?
Do you have any pics?
I agree that with the more power, speed ,etc. its a good idea.
Thanks
Barry.
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Old 11-12-2011, 09:36 PM
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I found a few, sorry they are so bad. I know I have more and can take a few more this week.
I ran down the middle with 2 heavy wall tubes connecting them together at the transmission mount and the rear cross member. I wanted to keep 2 areas completely open for fuel tanks on both sides of the drive shaft and inside the frame rails. You would not need to do it this way. Then diagonal over to the boxed frame both sides at the transmission and again just behind the rear cross member.
When I say rear cross member, I mean the one just ahead of the rear end.
I cut the cross member out under the transmission and made it removable with the trans mount on it. This removable cross member is connected to the X bracing system with bolts. It is important that its all tied together.
Also, all 4 places the diagonal braces (X braces in 4 pieces) connect to the boxing plates welded into the frame I made much heavier than the standard boxing material.

I bet this all sounds like a bunch of golblegook, if so, just ask questions, I will be happy to answer them.

Just today I finished the rear air shock mounts including an additional cross member that sits on top of the frame rails and serves as the top shock mounts as well as a bed support.
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