Driveshaft rubbing - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 28 (permalink) Old Jul 29th, 19, 11:25 PM Thread Starter
 
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Need some help here with a driveshaft issue. I just lowered the rear end with BMR 2” lowering springs. Now, when I am driving and hit dips in the road the driveshaft is rubbing on the floor pan under the back seat area. It’s rubbing in two spots ( see attached pictures). I am going to end up taking it to the local shop to have it fixed.

What I am looking for is some input as to what would cause the driveshaft clearance to be so small? Car is a 65 and has a Borg warner T-10 tranny and a 396 in it, 12 bolt rear end. It’s is lowered 2” in the front, 2 in the rear.

Just want to have an idea what possible problems/solutions are when I take it in.
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post #2 of 28 (permalink) Old Jul 30th, 19, 7:57 AM
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Re: Driveshaft rubbing

It's what can happen when you lower a car.

Old school method: a great big hammer.

Seriously, it's the easiest way to solve the problem. A little "tweaking" in the rub areas. Unless you want to remove the whole interior and install a new larger driveshaft tunnel.
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post #3 of 28 (permalink) Old Jul 30th, 19, 11:36 AM
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Re: Driveshaft rubbing

My 66 has 2Ē dropped spindles and 2Ē dropped springs in the front and 2Ē dropped springs in the rear and My driveshaft does not rub. Iím going to switch to 3Ē dropped springs in the rear but will enlarge the driveshaft tunnel first.
I already had to enlarge the transmission tunnel. I should have done them both at once

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post #4 of 28 (permalink) Old Jul 30th, 19, 12:23 PM
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Re: Driveshaft rubbing

How's your pinion angle compared to the transmission yoke angle now? If the pinion angle is "pointing up", you may be able to get the clearance you need by installing adjustable upper control arms and bringing it down some. This assumes this doesn't throw your front/rear angles out of tolerance.

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post #5 of 28 (permalink) Old Jul 30th, 19, 12:31 PM Thread Starter
 
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So if I did want to modify the tunnel, backseat comes out, carpet gets pulled back, cut, and weld in a new tunnel with more clearance ? Anyone have an idea what this should reasonably cost ?
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post #6 of 28 (permalink) Old Jul 30th, 19, 1:12 PM
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Re: Driveshaft rubbing

Have you already changed out the body bushings? Worn body bushings can do this. Easier to change out than building a new tunnel.
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post #7 of 28 (permalink) Old Jul 30th, 19, 1:15 PM
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Re: Driveshaft rubbing

Is your Driveshaft new ?
is it too long ??
and therefore jaming/bottoming out into the Trans making the Shaft go up into the Tunnel when there are dips in the road

Cutting up the Tunnel is a last resort, instead raise up the Rear

See # 4 Post as the best solultion & likely the Reason for the Driveshaft Rubbing on the Tunnel

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post #8 of 28 (permalink) Old Jul 30th, 19, 1:23 PM
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Re: Driveshaft rubbing

Quote:
Originally Posted by 427L88 View Post
Have you already changed out the body bushings? Worn body bushings can do this. Easier to change out than building a new tunnel.

What Gene said.
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post #9 of 28 (permalink) Old Jul 30th, 19, 1:25 PM
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Re: Driveshaft rubbing

Another option is a Ford 9 inch... the lower pinion position will allow more room and offer better driveline angles compared to the 12 bolt. This is not a budget solution, but it is another solution.
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post #10 of 28 (permalink) Old Jul 30th, 19, 1:25 PM
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Re: Driveshaft rubbing

Look into what Gene said about body bushings and also check to see if the rear transmission mount is the correct one.
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post #11 of 28 (permalink) Old Jul 31st, 19, 12:42 AM
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Re: Driveshaft rubbing

Agree with all. Tunnel cutting should be a last resort. Itís a lot of work = expensive.
The nine inch with its lower pinion is a solution I hadnít thought about. In my case Iím running a V6 so I donít need it for strength but something to consider.
Body mounts would be the easiest/least expensive. Adjustable uppers could help and are fairly simple to install.
Do you know what your current rearend and transmission output shaft angles are?

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post #12 of 28 (permalink) Old Jul 31st, 19, 12:47 AM Thread Starter
 
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I don’t know what the angles are , but when I take it to my shop next week, I’ll have them take a look and see if it’s set up properly
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post #13 of 28 (permalink) Old Jul 31st, 19, 12:47 AM
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Re: Driveshaft rubbing

If the car has a 4 speed, it's possible you have a transmission mount (TH400) that is too tall. It will cause a rub at the front of the driveshaft.
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post #14 of 28 (permalink) Old Jul 31st, 19, 10:42 PM
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Re: Driveshaft rubbing

Could add in a rear coil, thicker rubber spacer and lift the car 1/2" or so.

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post #15 of 28 (permalink) Old Aug 1st, 19, 5:45 PM
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Re: Driveshaft rubbing

Also check all rear upper and lower control arm bushings. If these are old and worn there will be slop in the suspension from these parts as well as body bushings...
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