I just swapped a TH400 into my 2000 trans am. I was going to try and use my stock t56 crossmember with the 1" spacer.

I have spohn kmember and solid motor mounts, and when I bolted trans up, there's about 2.5 inches gap from trans mount to my crossmember. Did I mount something wrong?

 

This is a google picture I found which a member on here had same issue. He never said what his problem was ��

 

Did you ever figure it out? I am having the same issue.

Turbo 400 midwest chassis crossmember
prothane motor mount

and I have a good 2.5 gap between bottom of mount and crossmember.

If i lower the trans that much my drive shaft gets stuck on safety loop.

ugh..... i thought my swap was going to be simple.

 

Thats an m6 crossmember. Doesn't work with an automatic.

 

Bogart this photo but should look like this.


http://m.bmrsuspension.com/?page=products&productid=321

 

Kind of difficult to diagnose when the problem is with a Midwest crossmember and theres a mystery picture of a Spohn and a product picture of a BMR.

This kind of problem needs to be checked with an angle finder. Put the transmission where it needs to be and maybe post a picture of where that puts it in relation to the crossmember.

Right now there are two random pictures and nothing showing the actual vehicle and crossmember with the problem.

 

 

That sure does look like a m6 cross member.
I recently swapped an m6 and a4 and the difference is noticeable from a picture.

 

 

I don't have a th400. The only thing I have is a stock m6 cross member. It measures 4" from the trans mount pad to the body on the passenger side and 1/2" on the drivers side.
Not sure if this helps.

 

Here is some better pictures and info.
I have a stock k member with prothane mounts. Midwest chassis tunnel mount torque arm with tsp tru duals drive shaft safety loop.
Quick performance ford 9".
"Th400" Midwest chassis crossmember

I have the rear end jacked up and loaded, when i attempt to lower the trans to the mount the driveshaft sits about an inch above the crossmember.






In order to get the driveshaft fairly centered in the driveshaft loop i have to shim the transmission up 2" on top of the mount.

The mount is prothane that was off my 4l60 that was in the car. Now i have read that a h400 mount is about 1/4" bigger but that still does not get me close to the crossmember.








Any one have any thoughts or input?

 

When I swapped from a m6 to th400 I used my m6 cross member. I used a one inch spaced inbetween the trans and mount. I still had rubbing on my driveshaft/mwc safety loop. I cut it off out of frustration. I will weld it back on at some point

 

 

I would still check the driveline angles to be sure the transmission is in the right place when it fits spaced up. It kind of looks like that u joint operating angle is too much. Trans looks high in the back. That would mean the cross member is right but the ds loop is wrong.
If the ds loop is removed and the angle is correct with the trans on the cross member you would know exactly whats causing the problem.

 

 

Hey bud do you have any pics of the transmission mounted to the crossmember now? I too am using the m6 crossmember and using the th400 with prothane mount. Also Have you had any driveline vibrations or anything since?

 

I do not have any pictures man. I took a piece of 1x1in aluminum from tractor supply, drilled holes in it and put it between the trans and trans mount. And yes I have vibrations. I have had vibrations ever since I have put my moser 9in in 4 years ago...

 

I hear ya man lol, ever since my 9” went in i’ve had it too! I think it could be the tunnel mounted torque arm though. I thought about switching to a crossmember relocated long arm later on to see if that helps. Do i need any longer bolts or anything after the spacer install?

 

Yes you will need longer bolts. It's been a minute since I did mine. So you will have to mess with t and see what you come up with.

 

Yea that's called two options of the "correct" part and I even supplied a link to one of them. Sorry you didn't understand. I'll try to make myself more clear next time I try to help someone.