Using adjustable LCAs to compensate for driveshaft length?
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TECH Enthusiast
Joined: Nov 2001
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From: Rockland County, NY
Using adjustable LCAs to compensate for driveshaft length? OK here is my problem. I'm using the stock driveshaft with my Moser 12 bolt and the driveshaft is almost too long. Sometimes when I brake to a stop abruptly or don't shift gears very smoothly killing the foward momentum, I can hear and feel the driveshaft bottom out against the tranny. When looking at it, you can see that the driveshaft could use maybe a 1/2" trimming. Now, I also have adjustable LCAs. If I were to lengthen the arm and push the rear end back a little more, wouldn't that in effect give me a little more play with the driveshaft? Does that sound feasible?
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Re: Using adjustable LCAs to compensate for driveshaft length? ...PLAYING WITH FIRE, but hey, ive done 100s of geto mods like that. so trial and error is how we learn. to answer your question, i honestly have no fu$%kin clue. sorry <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
Re: Using adjustable LCAs to compensate for driveshaft length? I have a Moser and see what your talking about with the driveshaft being too long now. I don't think I would try to adjust the LCA's though to make more room.
BTW if your hearing clunking noises from your rear I really think you should check the top two bolts on your torque arm. If theyare loose itmakes all kinds of clunking noises.
BTW if your hearing clunking noises from your rear I really think you should check the top two bolts on your torque arm. If theyare loose itmakes all kinds of clunking noises.
Re: Using adjustable LCAs to compensate for driveshaft length? [quote]Originally posted by Phil99TAsoon:
<strong>OK here is my problem. I'm using the stock driveshaft with my Moser 12 bolt and the driveshaft is almost too long. Sometimes when I brake to a stop abruptly or don't shift gears very smoothly killing the foward momentum, I can hear and feel the driveshaft bottom out against the tranny. When looking at it, you can see that the driveshaft could use maybe a 1/2" trimming. Now, I also have adjustable LCAs. If I were to lengthen the arm and push the rear end back a little more, wouldn't that in effect give me a little more play with the driveshaft? Does that sound feasible?</strong><hr></blockquote>
Since your control arms are adjustable I don't see any reason why not, if they adjust far enough. Just keep an eye on your pinion angle <img src="gr_images/icons/wink.gif" border="0"> .
If that doesn't work you might want to look at a pair of control arm relocation brackets. I installed a set of BMR's along with new (non adjustable) control arms after I lowered my car with Eibachs. I noticed that my rear wheels seem to be set just a little further back in the wheel wells now. The arms were the same length as the stock ones, so I am assuming that changing the mounting points caused this slight change.
<strong>OK here is my problem. I'm using the stock driveshaft with my Moser 12 bolt and the driveshaft is almost too long. Sometimes when I brake to a stop abruptly or don't shift gears very smoothly killing the foward momentum, I can hear and feel the driveshaft bottom out against the tranny. When looking at it, you can see that the driveshaft could use maybe a 1/2" trimming. Now, I also have adjustable LCAs. If I were to lengthen the arm and push the rear end back a little more, wouldn't that in effect give me a little more play with the driveshaft? Does that sound feasible?</strong><hr></blockquote>
Since your control arms are adjustable I don't see any reason why not, if they adjust far enough. Just keep an eye on your pinion angle <img src="gr_images/icons/wink.gif" border="0"> .
If that doesn't work you might want to look at a pair of control arm relocation brackets. I installed a set of BMR's along with new (non adjustable) control arms after I lowered my car with Eibachs. I noticed that my rear wheels seem to be set just a little further back in the wheel wells now. The arms were the same length as the stock ones, so I am assuming that changing the mounting points caused this slight change.
TECH Apprentice
Joined: Nov 2001
Posts: 329
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From: Northern CA.
Re: Using adjustable LCAs to compensate for driveshaft length? can't any good machine ship shorten it 1/2 to 3/4 of an inch??
Shouldn't cost that much....
Think about this, if GM designed the rear suspemnsion to be where it is now what would moving it do to your geometry?
seems to me if you push your rear axle back it will not only look funny because of the tire being offset in the wheel well but it will probably rub when entering driveways.... no?
Shouldn't cost that much....
Think about this, if GM designed the rear suspemnsion to be where it is now what would moving it do to your geometry?
seems to me if you push your rear axle back it will not only look funny because of the tire being offset in the wheel well but it will probably rub when entering driveways.... no?
Re: Using adjustable LCAs to compensate for driveshaft length? [quote]Originally posted by QuikSSilver:
<strong>can't any good machine ship shorten it 1/2 to 3/4 of an inch??
Shouldn't cost that much....
Think about this, if GM designed the rear suspemnsion to be where it is now what would moving it do to your geometry?
seems to me if you push your rear axle back it will not only look funny because of the tire being offset in the wheel well but it will probably rub when entering driveways.... no?</strong><hr></blockquote>
Rubbing when entering driveways? Wait a minute <img src="gr_eek2.gif" border="0"> , the change on my car isn't that big or noticeable. I know something looks a little different because it is my car and I tend to be **** about these things, but nobody else can tell. In fact I think it looks more centered now than it did before. It seems to mave moved only about 1/4-1/2 of an inch or so if any at all.
<strong>can't any good machine ship shorten it 1/2 to 3/4 of an inch??
Shouldn't cost that much....
Think about this, if GM designed the rear suspemnsion to be where it is now what would moving it do to your geometry?
seems to me if you push your rear axle back it will not only look funny because of the tire being offset in the wheel well but it will probably rub when entering driveways.... no?</strong><hr></blockquote>
Rubbing when entering driveways? Wait a minute <img src="gr_eek2.gif" border="0"> , the change on my car isn't that big or noticeable. I know something looks a little different because it is my car and I tend to be **** about these things, but nobody else can tell. In fact I think it looks more centered now than it did before. It seems to mave moved only about 1/4-1/2 of an inch or so if any at all.
TECH Apprentice
Joined: Nov 2001
Posts: 392
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From: Williamsburg, VA
Re: Using adjustable LCAs to compensate for driveshaft length? You should be able to move your rear axle back ~ 1/2" without issues. The torque arm determines the angle of the pinion. Where is the interference coming from? The end of the trans yoke butting the tail shaft bearing or the output shaft butting the inside of the trans yoke? If the former, you could shorten the yoke ~ 1/4". But, sooner or later you will want to get a stronger D/S.
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Re: Using adjustable LCAs to compensate for driveshaft length? first check your lower control arm mounts to the rear end.. moser is popular for oversizing the bracket, therefore requiring shims to snug up the lca so they dont clunk around..
after that.. yes u can adjust out the lca's.. as long as the torqe arm doesnt come out of its mount to the transmission you are a o.k. the pinion angle will not change anyways.
after that.. yes u can adjust out the lca's.. as long as the torqe arm doesnt come out of its mount to the transmission you are a o.k. the pinion angle will not change anyways.
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Re: Using adjustable LCAs to compensate for driveshaft length? go ahead and move the rearend back. our rearends are a little forward of the center of the wheelwells anyways. i moved mine back about 1/2" to get it in the center to fit my 28" tires
Re: Using adjustable LCAs to compensate for driveshaft length? Personally, I don't see how it could affect or harm anything to use the adjustables to move the axle back a bit. I've moved mine back a bit just to center the tire in the wheel wells.
Tony
Tony
