dbreese Posted June 15, 2008 Share Posted June 15, 2008 I'm trying to install a BMR driveshaft loop and I'm having clearance issues. Temporarily bolted the loop to the floorpan brace and installed the driveshaft. Well where the shaft passes through the loop best I can tell there is less than 1/4" of clearence at the top. I looked and the loop will only go so far up inside the trans tunnel. Is this enough clearance? I'm afraid that with the rear articulating that the shaft will rub the loop. HELP!!!! David Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted June 15, 2008 Share Posted June 15, 2008 what condition are your body mounts in? if they are in bad shape, the body could be sitting lower causing the clearance issue do you know if you have the correct trans mount, this too could cause a clearance issue I just mounted one of there loops, no issues here, I welded mine to the floor brace did you try turning the loop 180* you could also use a 4x4 on a floor jack, against the floor brace and *adjust* the floor a little Quote Link to comment Share on other sites More sharing options...
dbreese Posted June 15, 2008 Author Share Posted June 15, 2008 Original body mounts which are fair. Factory crossmember and tranny mount. Whats funny is that the loop it self will not fit flush in the trans tunnel. I had to flip the loop around which placed it closer to the u-joint. I guess it could be the body mounts. David Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted June 15, 2008 Share Posted June 15, 2008 use the floor jack and block of wood and *adjust* the floor a bit Quote Link to comment Share on other sites More sharing options...
dbreese Posted June 15, 2008 Author Share Posted June 15, 2008 Thanks Sam. About how much clearance should I have on the top d/s so it won't rub? David Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted June 15, 2008 Share Posted June 15, 2008 I only have about a 1/2" Quote Link to comment Share on other sites More sharing options...
kc8oye Posted June 16, 2008 Share Posted June 16, 2008 hrrm.. should be interesting when i go to put mine in soon :> Quote Link to comment Share on other sites More sharing options...
dbreese Posted June 16, 2008 Author Share Posted June 16, 2008 Well I figured it out. I can mount it just in front of the floor brace. This places it about 4" from the u-joint and gives me almost an 1 1/2 " of clearance between the top of the loop and the d/s. Only drawback is I'll have to drill 4 holes through the floor pan. Oh well.... better safe than sorry. As the old Molly Hatchet song title goes " Flirtin With Disaster" . Been doing it for a while so I'll feel better once I have it installed. David Quote Link to comment Share on other sites More sharing options...
MeanMonte Posted June 16, 2008 Share Posted June 16, 2008 i dont think the loop is going to do much if its only bolted to the sheet metal. should be mounted to the body brace. how about some pics as i am gettign ready to make one for my car. good luck! Quote Link to comment Share on other sites More sharing options...
502ci Posted June 16, 2008 Share Posted June 16, 2008 i dont think the loop is going to do much if its only bolted to the sheet metal. should be mounted to the body brace. how about some pics as i am gettign ready to make one for my car. good luck! I would think it would be fine if big enough washers are used. Not much stress will even be placed on the loop in the event of driveshaft failure...it just keeps it from dropping to the ground...sure it will be spinning and bouncing around in the safety loop but that wouldn't cause it to have enough force to rip the floor apart. Bill Quote Link to comment Share on other sites More sharing options...
Heckeng Posted June 16, 2008 Share Posted June 16, 2008 Dbreese, just make sure like you were asking about, that you have enough room for axle movement. I would put it as close to the u-joint as possible while being slightly behind it. I put my loop too far towards the rear of the car and had interference issues when going over bumps. Fixed now, but it sure is unnerving when you hear it for the first time! Quote Link to comment Share on other sites More sharing options...
680HPStroker Posted June 16, 2008 Share Posted June 16, 2008 Wow, I've never heard of this many issues with a BMR loop. Mine went in easy and my driveshaft is centered inside the loop. I guess I was fortunate. Quote Link to comment Share on other sites More sharing options...
kc8oye Posted June 17, 2008 Share Posted June 17, 2008 NHRA rules require it to be within 6" of the front u-joint.. just somthing to consider if you are going to be on the track with it. Quote Link to comment Share on other sites More sharing options...
dbreese Posted June 17, 2008 Author Share Posted June 17, 2008 Yep it will be close enough to the u-joint. I agree with Bill using large washers under the bolt heads will make it plenty stable. The loop placement will allow the driveshaft to articulate with the rear suspension movement. David Quote Link to comment Share on other sites More sharing options...
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