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Author Topic: V730 shimmy/shake  (Read 2941 times)
wildbob24
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« Reply #15 on: March 11, 2011, 09:24:45 AM »

Brandon,

A cracked bulkhead was pretty common on the early 4106s, not very common on our models. Is it around the area that was removed for the V730 install?

Bob
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P8M4905A-1308, 8V71 w/V730
Custom Coach Conversion
Duluth, GA
brando4905
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« Reply #16 on: March 11, 2011, 09:31:32 AM »

Bob,

Haven't seen it in person yet, but from David's description this is the area in question.

Brandon
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1980 GMC H8H-649  8V71/V730 Marion,NC

"The highway is for gamblers, better use your sense" -Dylan
RJ
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« Reply #17 on: March 11, 2011, 09:45:44 AM »

Brandon -

The cracked bulkhead is a common problem when installing a V-730 in a coach that didn't come with one from the factory.  Reinforcing it is the proper repair.  Suggest that the steel be treated with POR-15 before installation, to reduce rust issues.  Also, a sheet of plastic or similar to reduce the risk of galvanic corrosion between the steel plates and the aluminum bulkhead is a good idea, too.

The following little detail is often overlooked when folk install a V-730 into a coach that didn't have one as OEM:

OEM has a support bracket that runs from the bulkhead to the rear bumper cradle, with a donut-like rubber bushing.  This helps spread the weight load of the transmission, so that it's not all hanging off the engine's bell housing.

I'll see if I can find a photo, but in the meantime, you might try calling Luke to see if he's got the necessary parts in his collection.  888-262-2434 will get you thru to him.

Might also suggest replacing the motor mounts on the bulkhead while you're in there.  Chances are that the additional movement due to the cracked bulkhead has accelerated their wear.

FWIW & HTH. . .

 Wink

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RJ Long
PD4106-2784 No More
Fresno CA
brando4905
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« Reply #18 on: March 11, 2011, 11:23:12 AM »

RJ,

Thanks for all the good advice. A photo would be great if you can dig one up.

I think that I have the OEM support bracket, it goes from the bulkhead to bumper under the trans. and has a mini airbag on top that the trans. sits on.

Brandon
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1980 GMC H8H-649  8V71/V730 Marion,NC

"The highway is for gamblers, better use your sense" -Dylan
RJ
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« Reply #19 on: March 11, 2011, 05:57:57 PM »

Brandon -

That's exactly what I was talking about - the bracket with a mini-airbag-like bushing to support the transmission.

Send me the actual VIN on your coach.  Besides the normal delivery roster that I have which tells who originally bought the coach from GMC, I've got another, very, very rare roster that lists the Buffaloes that had V-730s OEM.  You might have one of these rare Buffs!

The plot thickens!

 Wink
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RJ Long
PD4106-2784 No More
Fresno CA
brando4905
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« Reply #20 on: March 12, 2011, 04:15:40 AM »

RJ,

It's H8H-649  A155, it has a clutch pedal, so not an OEM installation. Not sure who did the swap, pretty sure it was after Anderson took it out of service.

Thanks,
Brandon
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1980 GMC H8H-649  8V71/V730 Marion,NC

"The highway is for gamblers, better use your sense" -Dylan
brando4905
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« Reply #21 on: March 18, 2011, 12:02:26 PM »

Little bit of an update,

Gus, slip joint splines do have some wear. Having a new shaft made.

So, once we get the bulkhead repaired and put in the new drive shaft, I'm hoping the shimmy at take off will be gone.

Brandon
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1980 GMC H8H-649  8V71/V730 Marion,NC

"The highway is for gamblers, better use your sense" -Dylan
gus
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« Reply #22 on: March 19, 2011, 06:53:23 PM »

Brandon,

Let us know the final outcome.
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PD4107-152
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Ash Flat, AR
brando4905
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« Reply #23 on: March 22, 2011, 12:19:59 PM »

New driveshaft and repaired bulkhead=no more shimmy/shake!  Grin

Thanks for all the help guys.

Gus, thanks for pointing me in the right direction.
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1980 GMC H8H-649  8V71/V730 Marion,NC

"The highway is for gamblers, better use your sense" -Dylan
wildbob24
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« Reply #24 on: March 22, 2011, 12:22:01 PM »

Brandon,

Excellent news. Glad the fix was relatively minor.

Bob
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P8M4905A-1308, 8V71 w/V730
Custom Coach Conversion
Duluth, GA
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