Did you ever notice. . . .
Did you ever notice something about transmissions. . . . Did you ever notice something about tranny complaints??? 95% of the complaints about transmission problems/breakage/etcetera come from GXP owners as opposed to IMP/MC owners . . .what's up with that???
Last edited by eddiemoney; Jul 17, 2007 at 07:36 AM.
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Joined: Jan 2007
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From: LITH, IL.
at a guess, they have been out an extra year over the Chevy LS4, meaning more average miles. Maybe some teething pains in the tranny building. Also supposed to be the sportier of the trio, probably driven harder.
the clutches burn up on them from the shifts being soft. i have my trans pressure maxed out so my shifts are hard and quick. so my clutches will last a long time, now the mechanical parts in there may fail quicker but i chirp 2nd gear daily and the trans is holding up like a champ
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12 Second Club
Joined: Jul 2006
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From: Goldsboro, NC
I drive it TapShift 90-100% of the time and on the GXP have 12,000 miles and I'm not soft on a car by any means. I have had 0 issues with mine.
On my 2004 (42,000 miles) I drive in TapShift 90-100% also, made well over 100 1/4 passes and beat it like a dog every day. Now then the only problem I had with my 04 is I blew the input shaft (at the track) during the 1-2 shift and in doing so it decided to run it's way through the TC, so $3,800 later I have a fully built tranny that is "suppost" to be bullet proof. The reason my 04 blew the input shaft is the whole "chirping" 2nd on the shifts at WOT. When your on Drag Radials or Slicks the car doesn't like it. Be careful with the trans pressure maxed and remember it's alot cheaper to replace clutches then it is an input shaft/TC or Tranny case if it goes out that way.
Tate
On my 2004 (42,000 miles) I drive in TapShift 90-100% also, made well over 100 1/4 passes and beat it like a dog every day. Now then the only problem I had with my 04 is I blew the input shaft (at the track) during the 1-2 shift and in doing so it decided to run it's way through the TC, so $3,800 later I have a fully built tranny that is "suppost" to be bullet proof. The reason my 04 blew the input shaft is the whole "chirping" 2nd on the shifts at WOT. When your on Drag Radials or Slicks the car doesn't like it. Be careful with the trans pressure maxed and remember it's alot cheaper to replace clutches then it is an input shaft/TC or Tranny case if it goes out that way.
Tate
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Mine is shifting just short of barking the tires on the 1-2 and 24K of beating and is holding up well too, trans temps stay about 170 too according to HPT scanner.
The maxed trans line pressure also brought my trans temps upt to 200 as well and you could hear the pump whine in the trans too when put in gear.
I back the pressure down to just above stock about 10% and use the intense shift kit and the temps went down and the whine went away.
The maxed trans line pressure also brought my trans temps upt to 200 as well and you could hear the pump whine in the trans too when put in gear.
I back the pressure down to just above stock about 10% and use the intense shift kit and the temps went down and the whine went away.
The Torque Tanagement, Differential Score Protection, etc on the Impala SS is so sensitive that I think that it would be impossible to push it hard enough to break, it might be a little less agressive of a program on the GXP.
I am not so sure it is the tap shift. There are other GPs with tapshift without the issue. Honestly, I wonder if the tire size is an issue.
Tap shift isn't any different on the trans as far as limiters go...I've used tap a bit on my 04 no issues and I shift at 6000 rpm (3.8l) vs stock 5350 and (knock on wood) tranny's good after 100+ track passes.
On The Tree
Joined: Aug 2007
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From: Oregon
I like my tranny I take it everywhere I go HA! HA! 34k on my 06 GXP drive it like you stole it. Took it to 102mph in 2nd!! on track over revd it ouch!! won't do that again. when you tapshift you must upshift at 95mph for it takes the brain of the car to think to long and by that time it will be to late..... 
Originally Posted by Ls4GXP
when you tapshift you must upshift at 95mph for it takes the brain of the car to think to long and by that time it will be to late.....
On The Tree
Joined: Aug 2007
Posts: 155
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From: Michigan
Originally Posted by hexxLS4
Shouldn't it just auto-shift into 3rd anyways?
Originally Posted by mikeroot2
Nope. Will not auto shift. If you put it in maual mode to use tap shift that's what it is, manual. It will however prevent you from down shifting if the speed is too high and would cause redline rpms.