55-59 chevy trans crossmember adjustment caused by mustang II suspension upgrade - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-29-2010, 06:04 PM
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55-59 chevy trans crossmember adjustment caused by mustang II suspension upgrade

Hey guys, I recently installed a Mustang II front end on my 56 Chevy truck, I installed it based on the instructions. Now I have run into a problem with my trans crossmember sitting to far back. Is this normal?? Its only about 2 inches or so off. Should I move the crossmember up or just weld some tabs to the front of the crossmember to make it work??
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Old 08-29-2010, 09:32 PM
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move this thread over to basics for maybe some more views and suggestions
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Old 08-29-2010, 09:52 PM
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Quote:
Originally Posted by vortectim
Hey guys, I recently installed a Mustang II front end on my 56 Chevy truck, I installed it based on the instructions. Now I have run into a problem with my trans crossmember sitting to far back. Is this normal?? Its only about 2 inches or so off. Should I move the crossmember up or just weld some tabs to the front of the crossmember to make it work??
This falls into the same category as an engine swap in my opinion. What I do there, because the transmission usually doesn't match the car, is to use the ends of the crossmember that belong to the car and the center part of another crossmember that belongs to the transmission. So I have 3 pieces. I bolt in the outer two pieces to the car, slide the motor trans into position with the center piece of the crossmember bolted to the transmission and then just connect the whole mess together as one piece with a MIG. Presto, low-buck crossmember that works.
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Old 08-30-2010, 09:47 AM
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I must be missing something here. Having installed a few Mustang II IFS systems in the past I have to wonder what is causing your trans crossmember to be out of line? Did the IFS installation interfere with your stock engine mounts?? I suppose if you're still using an original block with he front mounts it could have. Just wondering how this happened.
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Old 08-30-2010, 05:40 PM
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These crossmembers are the originals to the truck and they are still riveted to the frame. The previous owner did an engine swap to a 350 and just welded some tabs to the front crossmember and made it a front mount engine. The engine and trans was fine at that point. Now I have the mustang II suspension in there and welded it in by the instructions measurements and the transmission crossmember is now 2 inches to far back. Is this normal?? Am I suppose to have to move the trans crossmember forward??
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Old 08-30-2010, 06:03 PM
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Mounts

Hey Tim, Most of the time when folks do a MII conversion they go to side mounts and a new transmission crossmember. If you're staying with stock engine and transmission mounts then you will need to move the engine mounts forward to allow the bellhousing mounts to line up. Sounds like the front mounts are in the wrong place. I'll post photos of my setup if you want. I converted to side mounts and a new transmission crossmember, but I don't do Mustang 2. olnolan
Hey, Read the 55-59 thread by doubledick, it covers alot of material on 55-59 modifications with good photos. olnolan

Last edited by OLNOLAN; 08-30-2010 at 06:15 PM. Reason: 55-59 group
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Old 08-30-2010, 06:47 PM
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Yes sir, thank you!! Thats what I needed to hear. Yes I am about to weld in side mounts to my front crossmember. I just wanted to make sure this was a normal thing. No site or instructions say that this has to happen. Thanks for the help!!
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Old 08-30-2010, 06:58 PM
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???????????

Hey Tim, I don't think you'll be able to make a side mount setup off the OE front crossmember, I will have to be off the MII crossmember or the frame.olnolan
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Old 08-30-2010, 08:19 PM
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No wait, I already removed the original front crossmember. haha, I replaced it with the MII. All thats in my frame right now is the MII and the original trans crossmember. Im going to weld the new motor mounts to the MII and move the trans crossmember up.
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Old 08-30-2010, 08:35 PM
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??????????

Hey Tim, I still don't see why you need to move the OE trans crossmember. If you're gonna use the original bellhousing mounts, just weld the engine mounts in with the bellhousing location as your template. The engine mounts don't have to be dead centered on the MII crossmember, seems they could be offset slightly without a problem. olnolan
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Old 08-30-2010, 08:36 PM
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I would set the motor back as far as you can, Leaving enough room between the heads and firewall.. You want just enough room to take the dist out if you had too.. Plus it better for performance..I don't think your side mounts will fall on the crossmember,, I maybe wrong, But I don't think they will..
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Old 08-30-2010, 10:45 PM
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View my picture. This is what I have to work with. When I bolted my transmission up, the entire side mount motor mounts ended up being just behind the crossmember.
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Old 08-30-2010, 11:17 PM
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build your mounts off the inside of the frame..
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Old 08-31-2010, 07:55 AM
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Oh, Ok

OK, I see what you're working with now. Like Randy said, you may need to go inside the frame with something like these;http://www.heidts.com/_uploaded_file...10_catalog.pdf
or like my homemade;
OLNOLAN
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Old 08-31-2010, 03:55 PM
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Ok thanks guys!!!
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