TH400 mount issue
05-27-2017, 03:33 PM
#1
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TH400 mount issue 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?
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?
03-30-2018, 08:46 PM
#3
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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.
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.
04-01-2018, 01:55 PM
#5
Bogart this photo but should look like this.
http://m.bmrsuspension.com/?page=products&productid=321
http://m.bmrsuspension.com/?page=products&productid=321
Last edited by LS1121; 04-01-2018 at 02:06 PM.
04-01-2018, 02:52 PM
#6
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.
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.
04-01-2018, 02:54 PM
#7
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Here is what mine looks like.
I think I was sent one for a manual trans not th400
https://i.imgur.com/ZdO1yXc.jpg
I think I was sent one for a manual trans not th400
https://i.imgur.com/ZdO1yXc.jpg
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04-01-2018, 03:34 PM
#9
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Do you have any measurements on yours?
I jacked the rear end up and had to shim it 2” to get the driveshaft off the safety loop. I’m thinking mine is to low. I can’t even get the the trans all the way down with the drive shaft installed. It rest on the loop leaving an inch gap from mount to crossmember.
https://i.imgur.com/IqxuIx1.jpg
https://i.imgur.com/A6YNA5i.jpg
this picture is with the drive shaft resting on the loop and rear end jacked up.
https://i.imgur.com/m5t2WV8.jpg
I jacked the rear end up and had to shim it 2” to get the driveshaft off the safety loop. I’m thinking mine is to low. I can’t even get the the trans all the way down with the drive shaft installed. It rest on the loop leaving an inch gap from mount to crossmember.
https://i.imgur.com/IqxuIx1.jpg
https://i.imgur.com/A6YNA5i.jpg
this picture is with the drive shaft resting on the loop and rear end jacked up.
https://i.imgur.com/m5t2WV8.jpg
04-01-2018, 05:12 PM
#10
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.
Not sure if this helps.
04-01-2018, 08:26 PM
#11
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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?
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?
04-02-2018, 07:17 AM
#12
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
04-02-2018, 08:20 AM
#13
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That’s honestly what I may do. I am going to make some shims in the next couple of days. Mwc told me I could ship it back and they could check it. But I would have to pay shipping both ways and I would loose another week and a half. Racing season just started in Michigan. Lol
04-02-2018, 10:26 AM
#14
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.
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.
04-03-2018, 05:01 AM
#15
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I’m going to grab my pinion tool and double check them tonight. Had to cover 3rd shift the last couple nights.
I’ll remove the driveshaft and post a picture, if I remove the driveshaft and put the trans down on the crossmember and put a straight off it, it dam near angled at the ground.
As far as removing the loop it is welded to the tunnel mount torque arm bracket. I didn’t have any issues with it when I had the 4l60 in there. Only when I switched trans and crossmember. Same motor mounts and all.
I’ll remove the driveshaft and post a picture, if I remove the driveshaft and put the trans down on the crossmember and put a straight off it, it dam near angled at the ground.
As far as removing the loop it is welded to the tunnel mount torque arm bracket. I didn’t have any issues with it when I had the 4l60 in there. Only when I switched trans and crossmember. Same motor mounts and all.
04-03-2018, 01:43 PM
#16
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?
04-03-2018, 04:18 PM
#17
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...
04-03-2018, 04:23 PM
#18
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?
Last edited by shepss217; 04-03-2018 at 04:36 PM.
04-03-2018, 05:20 PM
#20
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.
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.
