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m37 frame strength

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m37 frame strength

Postby 52PLOWERWAGON » Thu Oct 12, 2017 3:48 am

would a stock m37 frame handle the excessive amount of torque a 6bt cummins puts out ?
or would I need to add more crossmembers to it and plate it ?

I have an engine lined up for the m , it shall be revived ....................... again, but this time with no nonsense
Thanks,TRAVIS
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Re: m37 frame strength

Postby W_A_Watson_II » Thu Oct 12, 2017 6:39 am

All depends on how you use it. A Stock frame will crack under any engine when used for extreme off road when flexing.
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Re: m37 frame strength

Postby RMS » Thu Oct 12, 2017 12:54 pm

2x on that !

the military cheeped out when they welded the xmember to the top frame rail flange. wc's and ffpw's were bolted
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Re: m37 frame strength

Postby m-37Bruce » Sat Oct 14, 2017 1:19 pm

If you can do it, you certainly should, weight plus torque could make things move more than their supposed to.
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Re: m37 frame strength

Postby PoW » Mon Oct 16, 2017 8:41 pm

I ran mine hard for over 250K miles on & off road, never had a frame problem.

In those 30 years, I went through 13 sets of rear ring/pinion: the power of my Detroit ate the Formate treated teeth through to razor blades. So will your Cummins W/overdrive @ 65 mph

Btw, that was with complete NOS drop-ins (back when you could buy them).

I recommend setting up a Dana 80 in 4.89:1 with M37 hubs for the rear.

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Re: m37 frame strength

Postby Kaegi » Tue Oct 17, 2017 7:19 am

PoW wrote:I ran mine hard for over 250K miles on & off road, never had a frame problem.

In those 30 years, I went through 13 sets of rear ring/pinion: the power of my Detroit ate the Formate treated teeth through to razor blades. So will your Cummins W/overdrive @ 65 mph

Btw, that was with complete NOS drop-ins (back when you could buy them).

I recommend setting up a Dana 80 in 4.89:1 with M37 hubs for the rear.

PoW


I am surprised to read that you fried the teeth. maybe the new production gears are tougher? I have never had one fail but mine were mostly flatheads with cams and raised compression. 1 v8 truck. all of mine were 5.83s
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Re: m37 frame strength

Postby 52PLOWERWAGON » Tue Oct 17, 2017 7:28 am

most likely I would run axles from an m135 deuce so hopefully i'll not have axle issues
Thanks,TRAVIS
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1952 M37 FARM TRUCK
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Re: m37 frame strength

Postby 06boblee » Tue Oct 17, 2017 9:22 am

PoW wrote:I ran mine hard for over 250K miles on & off road, never had a frame problem.



I recommend setting up a Dana 80 in 4.89:1 with M37 hubs for the rear.

PoW


Are you talking about a custom built Dana 80- or will the M37 hubs fit one?? Will the M37 hub fit any other axle without mods?
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Re: m37 frame strength

Postby PoW » Tue Oct 17, 2017 9:14 pm

That would be custom. Nobody makes off the shelf things that I need.

All the rears I ruined were from running around 70 with standard gear lube. Pulling heavy trailers, that sort of thing.

Those old gearsets just weren't meant to spin that fast, no time to cool before contact again.

Synthetics might help, but I'm not doing that drill this time.

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Re: m37 frame strength

Postby PoW » Tue Oct 17, 2017 9:24 pm

52PLOWERWAGON wrote:most likely I would run axles from an m135 deuce so hopefully i'll not have axle issues


Theys too wide..will look really odd. Even lower speeds, too.

You can cut them, reweld for proper distance, but getting someone with a forge to upset the axle shaft ends, then re-spline is hard to do.

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Re: m37 frame strength

Postby RMS » Tue Oct 17, 2017 10:05 pm

2xs on the diffs cant take the heat

PoW wrote:I ran mine hard for over 250K miles on & off road, never had a frame problem.

PoW


majority of the trucks ive seen, have a crack on the top flange of the drivers side frame rail at a large undercut(on the end of the weld) were the xmember is joined.

the truck pictured below has had 6 cracks on the 4 welds that attach the x members. ....and im still running a flat head. :P
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Re: m37 frame strength

Postby PoW » Wed Oct 18, 2017 6:20 am

That problem usually stems from loose steering components coupled with lumpy or out-of-balance tires.

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Re: m37 frame strength

Postby 06boblee » Wed Oct 18, 2017 7:36 pm

Is it the crossmember that cracks, or the frame rail? The crossmember goes all the way under the frame rail- would putting a bolt thru them help?
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Re: m37 frame strength

Postby rickf » Thu Oct 19, 2017 6:10 am

Bolted only frames don't crack because the bolts (or rivets) allow for some movement between the frame and cross member. When the cross member is welded there is no movement and something has to give and it is 90% of the time the frame rail next to the weld. Putting bolts in a welded cross member will do no good unless you eliminate the weld.
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Re: m37 frame strength

Postby 06boblee » Thu Oct 19, 2017 5:07 pm

rickf wrote:Bolted only frames don't crack because the bolts (or rivets) allow for some movement between the frame and cross member. When the cross member is welded there is no movement and something has to give and it is 90% of the time the frame rail next to the weld. Putting bolts in a welded cross member will do no good unless you eliminate the weld.

So- if the weld fails on the frame rail, wouldn't a bolt thru the rail and the crossmember maintain strength (after the weld fails?).
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