Auto Transmissions & GM
Thread Starter
Melting Slicks
Joined: Jan 2004
Posts: 2,246
Likes: 5
From: West Coast
Auto Transmissions & GM
Just wanted to say that GM engineers need to build a better automatic overdrive transmission. Since the 80's, all the rear-drive overdrive transmissions had problems.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Mine is fine. Get a shift kit.
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
Originally Posted by pettrix
Just wanted to say that GM engineers need to build a better automatic overdrive transmission. Since the 80's, all the rear-drive overdrive transmissions had problems.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Instructor
Joined: Jun 2004
Posts: 156
Likes: 0
From: Peoria AZ
I agree. I KO'ed mine last year (killed the 3-4 clutchpak). Had a friend rebuild it with Alto Red clutches, Kevlar band and a shift kit. Now it shifts like a maniac and tranny temps are a little lower.
Did you kill your A4?
Did you kill your A4?
Thread Starter
Melting Slicks
Joined: Jan 2004
Posts: 2,246
Likes: 5
From: West Coast
The information on the auto transmissions is found on the GM web-site. They state that:
4L60E - max torque of 370 LB.FT. (C5's)
4L65E - max torque of 400 Lb-Ft (C6's)
4L85E - max torque of 440 LB-FT (trucks only)
GM is producing auto transmissions that are on the BRINK of failure to the engines that are connected to. The LS1 was at 360 Lb-Ft and the NEW LS2 is 400 Lb-Ft. The auto transmissions MAX power ratings that they can handle is equal to the output of the engine.
Any MODS and BOOM - there goes the trans.
YES, my A4 blew with only 9000 miles and the only MODS were LS6 H&C and a tune.
4L60E - max torque of 370 LB.FT. (C5's)
4L65E - max torque of 400 Lb-Ft (C6's)
4L85E - max torque of 440 LB-FT (trucks only)
GM is producing auto transmissions that are on the BRINK of failure to the engines that are connected to. The LS1 was at 360 Lb-Ft and the NEW LS2 is 400 Lb-Ft. The auto transmissions MAX power ratings that they can handle is equal to the output of the engine.
Any MODS and BOOM - there goes the trans.
YES, my A4 blew with only 9000 miles and the only MODS were LS6 H&C and a tune.
Instructor
Joined: Jun 2004
Posts: 156
Likes: 0
From: Peoria AZ
Originally Posted by pettrix
The information on the auto transmissions is found on the GM web-site. They state that:
4L60E - max torque of 370 LB.FT. (C5's)
4L65E - max torque of 400 Lb-Ft (C6's)
4L85E - max torque of 440 LB-FT (trucks only)
GM is producing auto transmissions that are on the BRINK of failure to the engines that are connected to. The LS1 was at 360 Lb-Ft and the NEW LS2 is 400 Lb-Ft. The auto transmissions MAX power ratings that they can handle is equal to the output of the engine.
Any MODS and BOOM - there goes the trans.
YES, my A4 blew with only 9000 miles and the only MODS were LS6 H&C and a tune.
4L60E - max torque of 370 LB.FT. (C5's)
4L65E - max torque of 400 Lb-Ft (C6's)
4L85E - max torque of 440 LB-FT (trucks only)
GM is producing auto transmissions that are on the BRINK of failure to the engines that are connected to. The LS1 was at 360 Lb-Ft and the NEW LS2 is 400 Lb-Ft. The auto transmissions MAX power ratings that they can handle is equal to the output of the engine.
Any MODS and BOOM - there goes the trans.
YES, my A4 blew with only 9000 miles and the only MODS were LS6 H&C and a tune.
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Pro
Joined: Feb 2004
Posts: 507
Likes: 0
From: Owatonna MN
Originally Posted by pettrix
Just wanted to say that GM engineers need to build a better automatic overdrive transmission. Since the 80's, all the rear-drive overdrive transmissions had problems.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Remember this: you have to pay to play.
GM cuts costs to offer the best car they can within a set price point (choosing transmissions that are appropriate for the stock HP/TQ levels is part of that). The Corvette line always makes money, and choosing the proper components has a lot to do with it.
I feel your pain, but I think you are not looking at things in perspective...
Sorny
Le Mans Master
Joined: Dec 2001
Posts: 5,706
Likes: 552
From: St. Peters MO
C7 of Year Finalist (stock) 2019
2018 C7 of Year Finalist
Originally Posted by pettrix
Just wanted to say that GM engineers need to build a better automatic overdrive transmission. Since the 80's, all the rear-drive overdrive transmissions had problems.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Melting Slicks
Joined: Oct 2003
Posts: 2,183
Likes: 5
If you think GM ATX is bad, don't even try Mazda or Mitsubishi. My old MX6 ATX was trash. My current 3000GT VR4 ATX is even worse. However, the fix that I implemented for both of them helped extend their reliability by 100 fold (exaggerating). And I'm sure it'll do the same for the C5 ATX Tranny. I've noticed some posts of the temps the ATX trannies run.. and they are ridiculously high (above 200). I had the same probs w/ the VR4, and installed a heavy duty tranny cooler. It now runs reliably under 170.
Team Owner
Joined: May 2004
Posts: 26,345
Likes: 232
From: SoCal
Originally Posted by 2k2C5
Don't know the HP or TQ ratings but a new 6 speed auto will debut in the 06 Corvette.
Damm....I knew they would have to do this sooner or later.
Wonder if they will fit in the C5.....
DH
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by Dirty Howie
Damm....I knew they would have to do this sooner or later.
Wonder if they will fit in the C5.....
DH
Wonder if they will fit in the C5.....
DH
Team Owner
Joined: May 2004
Posts: 26,345
Likes: 232
From: SoCal
Originally Posted by EnglandGreen
Should be bolt in compatible but we'll have to wait and see when it is released. One of the tuners will fit it on a C5 and then all bets are off
DH
Melting Slicks
Joined: Dec 2004
Posts: 3,049
Likes: 0
From: The second childhood is the best one of all.
Originally Posted by pettrix
Just wanted to say that GM engineers need to build a better automatic overdrive transmission. Since the 80's, all the rear-drive overdrive transmissions had problems.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Whether it was the 2004R or the 700R4. Both STOCK factory transmission were weak and would break hard-parts with any HP level over 300HP.
Even the A4 or 4L60E on our C5s can't handle anything over 350HP. Even the new C6 auto trans, the 4l65E, is rated to 400HP & 385 LBS.FT.
A trans should be able to handle at least 100HP/75 LBS.FT or torque OVER the stock HP of the engine. Why build something that can handle only the HP of the engine. That is walking a fine line between it breaking. Add some mods and BOOM, there goes the trans.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Le Mans Master
Joined: Dec 2001
Posts: 5,706
Likes: 552
From: St. Peters MO
C7 of Year Finalist (stock) 2019
2018 C7 of Year Finalist
Burning Brakes
Joined: Dec 2004
Posts: 802
Likes: 2
From: North Royalton Ohio
Originally Posted by pettrix
-
They really need to hire the transmission engineers from overseas. They can build better OD units.
They really need to hire the transmission engineers from overseas. They can build better OD units.
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
I've had almost 500rwhp running through mine with no problems - and now circa 400rwhp with no problems. I shift like a **** and I drive it like I stole it. I almost never use Drive (except when I'm going past the police)
With a shiftkit, 160degree thermo and a Predator tune, it hasn't broken yet - 10 months and counting.
With a shiftkit, 160degree thermo and a Predator tune, it hasn't broken yet - 10 months and counting.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Originally Posted by 2k2C5
2005's are still building - don't let anyone tell you different - in fact they build through the 1st week of September - even though the 2006 Z06 start building on 7/25...(in limited numbers)
unless 2005 is a one-of-a-kind production year, then this guy is full of schit.
the next production year of Corvette always starts sometime in the first 2 weeks of July. But; current year models are still shippping to dealers - but that doesn't then equate to them "still being built"... just because there are some still in the pipeline - yet to make it on carriers/rail.
Unless... like I said earlier - that 2005 is a unique year.
Last edited by Mike Mercury; Jul 26, 2005 at 08:40 PM.