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 1Likes
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1
Post By Cashburn
06-07-2016, 10:34 AM
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CC Member
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Join Date: Jan 2012
Location: Saratoga,
CA
Cobra Make, Engine: Backdraft RT3 #1133, Ford Racing 306
Posts: 217
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Not Ranked
Driveline Lash
The amount of lash in my drive train seems to have gotten worse and is irritating at times. When in first/second at low speeds it causes bucking motions that require slipping the clutch or coasting in order to eliminate it. Anyone have any comments on this issue?
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06-07-2016, 11:20 AM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,115
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Not Ranked
Check all driveshaft bolts and most importantly that main diff bolt is very tight (like 3' breaker bar tight).
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06-07-2016, 11:51 AM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
Quote:
Originally Posted by Cashburn
Check all driveshaft bolts and most importantly that main diff bolt is very tight (like 3' breaker bar tight).
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I'm with Jay... Either a loose FWD differential bolt or a broken FWD differential bolt.
Kevin..... |
06-07-2016, 02:52 PM
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CC Member
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Join Date: Jun 2013
Location: Leesburg,
VA
Cobra Make, Engine: B and B Car 2 BDR
Posts: 31
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Not Ranked
Quote:
Originally Posted by Kobura
The amount of lash in my drive train seems to have gotten worse and is irritating at times. When in first/second at low speeds it causes bucking motions that require slipping the clutch or coasting in order to eliminate it. Anyone have any comments on this issue?
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Had this issue I had a broken drive shaft bolt and for some reason it would actually grab and the vehicle would move but bucked in 1st. Though after bucking started I only drove it maybe 2 miles. |
06-07-2016, 03:05 PM
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CC Member
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Join Date: Dec 2015
Posts: 1,442
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06-07-2016, 04:27 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,773
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Not Ranked
Quote:
Originally Posted by spdbrake
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That is a good point, is this an engine tuning/camshaft trait or driveline issue?
Gary |
06-07-2016, 04:31 PM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,483
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Not Ranked
Sounds like "trailer hitching". A healthy cam is usually part of the reason - but light springs on the centrifugal advance can aggravate it with advance swinging in and out with surges in the engine rpm. If it's gotten worse a thorough check of timing and carb settings might be in order.
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06-07-2016, 05:43 PM
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CC Member
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Join Date: May 2005
Posts: 379
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Don't worry just drive it...
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06-08-2016, 10:22 AM
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CC Member
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Join Date: Jan 2012
Location: Saratoga,
CA
Cobra Make, Engine: Backdraft RT3 #1133, Ford Racing 306
Posts: 217
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Not Ranked
I checked for loose nuts and bolts on the driveshaft and for indications of anything loose. Everything appears to be tight. I grabbed both rear tires and rotated one of them that moved about an inch at the tread. The driveshaft rotated in synch with the tire. My conclusion is that the lash is in the transmission. Any comments?
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06-08-2016, 12:28 PM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
Quote:
Originally Posted by Kobura
I checked for loose nuts and bolts on the driveshaft and for indications of anything loose. Everything appears to be tight. I grabbed both rear tires and rotated one of them that moved about an inch at the tread. The driveshaft rotated in synch with the tire. My conclusion is that the lash is in the transmission. Any comments?
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As Jay and I both said.. you need to check to see if bolt #17 has sheared. This bolt connects the front of the differential to the subframe.
RealOEM.com - Online BMW Parts Catalog
Kevin.... |
06-08-2016, 02:18 PM
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Average Guy
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Join Date: Sep 2002
Location: Rushville,
IN
Cobra Make, Engine: red Shell Valley, white stripes
Posts: 578
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Not Ranked
bucking problem
My small block does this, too. I like my idle speed as low as possible. But, if I increase it a couple hundred RPM's, the bucking is no longer a problem.
__________________
When I said I wanted to be somebody, I probably should have been more specific...
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06-08-2016, 04:59 PM
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CC Member
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Join Date: Jan 2012
Location: Saratoga,
CA
Cobra Make, Engine: Backdraft RT3 #1133, Ford Racing 306
Posts: 217
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Not Ranked
I verified that nothing is amiss with the differential attachment to the car frame for which I am very thankful as a loose differential could be disastrous. The schematic diagram of the e36 rear end was helpful although my hardware appears to be slightly different. e.g., hex socket bolts instead of hex head bolts and a different attachment scheme. So, unless I hear otherwise, I will follow the advise of our favorite BDR skeptic 'cbreez' and not worry and just drive it.
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