tranny crossmember flanges

RimfireJim · Post by **RimfireJim** » Tue May 31, 2011 3:21 pm

Now that I have the transmission/transfer case crossmember off and all cleaned up, I found that the forward flange that the skid plate bolts to isn't parallel with the rear flange, but is angled upward something like 5-10°. I would suspect that it is damage, as the skid plate was all bent to heck every which way, but it is so uniform all the way along the length of the crossmember that it looks like it was made that way. However, if I mate it up with my now-mostly-flat-in-the-middle skid plate, it clearly is not a good match-up. Are both flanges supposed to be parallel to each other and 90° to the vertical walls of the "hat" shape of the crossmember? Or, is the skid plate supposed to match the flanges on my crossmember as-is?

TomM · Post by **TomM** » Tue May 31, 2011 4:24 pm

Your skidplate should be flat in the center where it bolts to the crossmember. Your crossmember bottom flanges should be flat across eachother and parallel to the ground.
It sounds like your crossmember was bent upon impact. Bend the flanges back to mate up with your skidplate.
Tom

Bretto · Post by **Bretto** » Tue May 31, 2011 5:20 pm

Jim,

That is how mine was to, maybe not as bad as yours sounds but a little finesse and a big hammer does wonders. I found that some 1/4" trailer hitch tubing fits inside the channel nicely to use as an anvil.

ZeroGs · Post by **ZeroGs** » Tue May 31, 2011 7:47 pm

Not to spoil any fun you may have banging on metal but I do believe I have a spare. Near LAX if you every get out this way.

RimfireJim · Post by **RimfireJim** » Tue May 31, 2011 8:23 pm

Thanks for the info, idea, and offer, guys. I think I will make an outer die out of some hardwood, and using a filler like Brett did, rework it in my shop press, gradually bringing it back into shape in ~4" sections at a time. You can move a lot of metal with 20 tons and some improvised tooling! The part is already bead blasted clean and an owie in the other flange straightened out, so it is well on its way to being done.

Related question: on my left rear angled frame reinforcement, that goes from the left frame rail to the pintle hook plate, there is an upward curved depression in the lower flange toward the rear end of the member. It's maybe 1/4", or a little more, "deep" and about 4" long. Looks very factory-like: uniform, smooth. Is it supposed to be there? Is it there to provide more clearance for an electrical cable?

Bretto · Post by **Bretto** » Tue May 31, 2011 8:46 pm

That frame indent is for the flange connection at the muffler.

RimfireJim · Post by **RimfireJim** » Wed Jun 01, 2011 11:58 am

Thanks, Brett. Figured it was something like that. One less thing I have to straighten!

Bretto · Post by **Bretto** » Wed Jun 01, 2011 12:09 pm

I understand

Bretto · Post by **Bretto** » Wed Jun 01, 2011 12:29 pm

I am second guessing myself now that I re-read your post, I was thinking of the main rear cross member over the axle. I am not at home right now to check but I do know one of the 2 members has a section that is rounded up on the left side there.

Bretto · Post by **Bretto** » Wed Jun 01, 2011 3:22 pm

Ok, looking at my frame now. yes there is a section on both cross members that are flattened upward. The one you were talking about on the diagonal support is just in front of of the rear x member.

RimfireJim · Post by **RimfireJim** » Wed Jun 01, 2011 9:27 pm

Yes, I was asking about the one on the diagonal support. It can be seen pretty clearly in wtb853's photo here: http://www.willysmjeeps.com/v2/modules. ... _photo.php Guess I should have poked around in the gallery before asking.

Are you saying there is also an indentation in the lower flange of the lateral crossmember just forward of the diagonal braces? On the left side? Mine had something there, but it looked very irregular so I straightened it out as well as I could to look something like this in rdsar2k's photo and others I find: http://www.willysmjeeps.com/v2/modules. ... _photo.php I found one photo showing the tailpipe passing directly below there, but with generous clearance.

Bretto · Post by **Bretto** » Wed Jun 01, 2011 10:19 pm

Looks like this. Thanks Dave, borrowed your pic. Mine looks a little smoother of an arch though.

RimfireJim · Post by **RimfireJim** » Fri Jun 03, 2011 3:32 pm

Hmm, that's right where I straightened mine out. It looked so irregular (something like Dave's, though not as extreme) that I couldn't imagine it being "factory". I still think it may not be, as pics I found of other people's frames don't show that distortion.

Bretto · Post by **Bretto** » Sat Jun 04, 2011 7:40 pm

Here's mine. I bet its factory, it would be odd to see some bent in the same place from different frames across the country. I can see people straightening it out though. I'm sure Wes will know for sure. Wes?

tranny crossmember flanges

tranny crossmember flanges

trans skid plate