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GM Competition and Performance General GM Competiton and Performance |
02-15-2017, 09:25 AM
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#1
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Name: DIESEL_POWER
Title: NGM Diesel
Status: Not Here
Join Date: Jul 2006
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Posts: 5,178
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Built allison
Ok so I have a LML, and got a built trans, all is well except one thing, it goes into reverse rougher than it should. Almost like a soft slam into reverse. I was told by the builder it was normal, but it's so bad that the engine down pipe hits the fire wall on occasion because of this when out into reverse.
I put on over 40 k on it and changed to synthetic fluid and new filter, this seemed to help, but still pretty noticable.
Only thing that seems to help is leaving it in neutral for a few seconds before going into reverse.
Any ideas?
__________________
Proverbs 3:5-6 (KJV)
5 Trust in the Lord with all thine heart; and lean not unto thine own understanding. 6 In all thy ways acknowledge him, and he shall direct thy paths.
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02-15-2017, 09:29 AM
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#2
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Name: Chris Tobin
Title: Too Much Time
Status: Not Here
Join Date: Jun 2008
Location: Dayton, TN
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Posts: 2,662
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Wade, I don't have suggestions for the trans issues, but if your engine is moving that much your factory motor mounts are probably shot. You need to install a set of the Merchant Automotive motor mounts which are also available from several other vendors in colors other than MA Orange...
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Chris Tobin
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I might be able to help get you in a mag.
Custom poster size photos available. PM or email for info.
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02-15-2017, 10:44 AM
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#3
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Name: sootie
Title: .....like a BAWSS
Status: Not Here
Join Date: Jan 2013
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Posts: 866
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could be too tight a stall on the converter? If it is really lugging the engine down at idle, it is a big change from drive to reverse.
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02-15-2017, 11:12 AM
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#4
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Name: IdahoRob
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Apr 2006
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Posts: 2,337
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Wade, I've had a built tranny/converter in my LML for 35k miles and have never noticed that issue on my truck. I don't have an answer on what could be causing it, outside of a very aggressive converter. Do you have a stock TCM tune in it, or one modded for increased PSI?
Last edited by IdahoRob; 02-15-2017 at 11:13 AM.
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02-15-2017, 12:44 PM
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#5
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Name: DIESEL_POWER
Title: NGM Diesel
Status: Not Here
Join Date: Jul 2006
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Posts: 5,178
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The mounts are fine, it only jams in gear in reverse, no other gear or selection. Rob, yes the tcm was modified for extra rpm when towing using the exhaust brake, that's the way it was explained.
__________________
Proverbs 3:5-6 (KJV)
5 Trust in the Lord with all thine heart; and lean not unto thine own understanding. 6 In all thy ways acknowledge him, and he shall direct thy paths.
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02-15-2017, 12:46 PM
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#6
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Name: DIESEL_POWER
Title: NGM Diesel
Status: Not Here
Join Date: Jul 2006
Member`s Gallery
Posts: 5,178
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Had the tunes prior to the trans upgrade, since the trans upgrade this issue has been around.
__________________
Proverbs 3:5-6 (KJV)
5 Trust in the Lord with all thine heart; and lean not unto thine own understanding. 6 In all thy ways acknowledge him, and he shall direct thy paths.
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02-15-2017, 12:47 PM
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#7
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Name: DIESEL_POWER
Title: NGM Diesel
Status: Not Here
Join Date: Jul 2006
Member`s Gallery
Posts: 5,178
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Seems to me like a vb issue.
__________________
Proverbs 3:5-6 (KJV)
5 Trust in the Lord with all thine heart; and lean not unto thine own understanding. 6 In all thy ways acknowledge him, and he shall direct thy paths.
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02-15-2017, 03:23 PM
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#8
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Name: IdahoRob
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Apr 2006
Member`s Gallery
Posts: 2,337
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For giggles, I'd throw the stock tcm tune in it. If you didn't do the tcm tune yourself, then it's unknown if line pressure was played with. Increased TCM controlled pressure coupled with VB mods when the tranny was done, may not be playing nice.
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02-16-2017, 06:03 PM
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#9
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Name: dieselpro55
Title: Green Behind the Ears
Status: Not Here
Join Date: Aug 2008
Member`s Gallery
Posts: 54
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Maybe a mainline pressure shim with the spring would increase the pressure in the reverse...you could tune for a slightly lower idle and that would help some
Sent from my iPad using Tapatalk
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02-16-2017, 07:51 PM
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#10
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Name: DIESEL_POWER
Title: NGM Diesel
Status: Not Here
Join Date: Jul 2006
Member`s Gallery
Posts: 5,178
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I'll look into to the tcm Rob and let you know thanks
__________________
Proverbs 3:5-6 (KJV)
5 Trust in the Lord with all thine heart; and lean not unto thine own understanding. 6 In all thy ways acknowledge him, and he shall direct thy paths.
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