Drivetrain Questions and info regarding transmissions, clutches, etc.

Its time for 3.5 or 3.6 rear gearing !!!

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Old Nov 17, 2010 | 08:56 PM
  #121  
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Originally Posted by herrschaft
At the time, 245x35x19 all around. The tires only threw the speedo off by 1-2 mph since the rear stockers were 245x40x19. I've confirmed on many occasions roughly a 10mph inaccuracy in the reading when actual speed is 80mph. I've noticed that everyone else in here that has changed their FD has the 03-04 models, which is probably why my experience is different from theirs.
Did you swap the full pumpkin including the STUB AXLES? You are the ONLY person I have ever heard had issues.
 
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Old Nov 17, 2010 | 09:01 PM
  #122  
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Originally Posted by NFSP G35
^Not 7% acceleration. 7% higher revs vs 3.3 given same speed/same gear.

Transmission should be fine. Actually it's working less with a 3.7... in theory... of course a little "pep" will make you want to push it harder
This isn't accurate. It is 7% more revs in the engine AND the transmission. Transmission is working more - tires are working less. You will not experience transmission problems due to a FD swap.
 
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Old Nov 17, 2010 | 09:07 PM
  #123  
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^I wasn't speaking from the standpoint of transmission RPM but from the standpoint of mechanical advantage.

The transmission is working more, not harder... poor wording on my part

It's probably a wash in the long run though.
 
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Old Nov 17, 2010 | 09:15 PM
  #124  
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working more for the transmission is analogous to working harder

Its not really increasing/decreasing anything else

Most auto transmissions are rated in shifts though, not rpms so that doesn't really change the life expectancy of the tranmission.
 
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Old Nov 17, 2010 | 09:54 PM
  #125  
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Originally Posted by Tollboothwilley
Did you swap the full pumpkin including the STUB AXLES? You are the ONLY person I have ever heard had issues.
Mine acts the same.
 
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Old Nov 17, 2010 | 10:14 PM
  #126  
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Originally Posted by Tollboothwilley
Back a long time ago when we discussed this issue I read in the FSM that the TCM speed sensor compares with wheel sensor. If they are off more than a given amount then it disables the CC. This information is in that long thread that has been posted in here already.

The reason that CC works for OCG35 and some other people is because of the TCM changes in 2004.5. People that are 2003-2004 have the issues that 2004.5+ people should not.

There obviously are other factors that can disable CC but function should remain given TIRE SIZE is similar to stock up to ~80-84 MPH with the 3.5 FD and ~75-78 with the 3.69 FD.

When i first installed the 3.5 I could hold up to 85 MPH with the CC. As my tires are wearing down and in need of replacement now, I can only hold CC around 82-83 MPH.
But even pre-04.5 (including you) have CC... having it work only to 80 or 85 is not the same as "not having CC" or "losing CC" . Which is the clarification that I feel is important for people consider the gear swap... many people have stated they are reluctant to get 3.5 or 3.7 because the have been told they wont have CC. If those same people were told CC "might not" or even "wont" work "past" 80-85 I would bet they would no longer have concern - afterall who sets CC at 85?

This is the concept that started the concern of misinformation and confusion from the beginning.

And I'm not suggesting you had/have any part of the confusion... just using your info to reiterate the facts.
 
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Old Nov 17, 2010 | 11:32 PM
  #127  
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Originally Posted by Tollboothwilley
Did you swap the full pumpkin including the STUB AXLES? You are the ONLY person I have ever heard had issues.
I swapped just the pumpkin, axles remained in place.

Silencer_0 has this problem as well
 
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Old Nov 18, 2010 | 02:25 AM
  #128  
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Originally Posted by Canadian
Dave..quick question. Anyone else who has some insight I'd appreciate your input.

I didn't read the whole thread so maybe this was covered. Ever since my 6MT conversion was done, my CC has not worked. I was under the impression this is because the 5AT TCU is gone. But now it leads me to believe it's because I stuck with the 3.3 gears and with all the manual parts now (drive shaft for one) would this cause my cruise control to fail? Anyone have any insight on this?
This was the 1st thought about why his CC doesn't work
 
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Old Nov 18, 2010 | 03:02 AM
  #129  
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Originally Posted by OCG35
But even pre-04.5 (including you) have CC... having it work only to 80 or 85 is not the same as "not having CC" or "losing CC" . Which is the clarification that I feel is important for people consider the gear swap... many people have stated they are reluctant to get 3.5 or 3.7 because the have been told they wont have CC. If those same people were told CC "might not" or even "wont" work "past" 80-85 I would bet they would no longer have concern - afterall who sets CC at 85?

This is the concept that started the concern of misinformation and confusion from the beginning.

And I'm not suggesting you had/have any part of the confusion... just using your info to reiterate the facts.
Very true. Keep in mind the reason that they lose CC function: When you surpass the 82-85 MPH limit at any point it will kick a code P1612 i believe it is. This code prevents the CC from coming back on until you turn the car off. AS LONG AS YOU DONT EXCEED THE CUTOFF LIMIT YOU HAVE FUNCTION. If at any point you go over that speed it will not work til you cycle engine/ECU off.
 
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Old Nov 18, 2010 | 03:04 AM
  #130  
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Originally Posted by herrschaft
I swapped just the pumpkin, axles remained in place.

Silencer_0 has this problem as well
Are you both from the same year?
 
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Old Nov 18, 2010 | 03:09 AM
  #131  
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His is an 06, mines an 07. My 3.7 pumpkin came off an 09 g37 6mt coupe.
 
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Old Nov 18, 2010 | 03:15 AM
  #132  
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Mine came off an 09 G37S sedan 6mt
 
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Old Nov 18, 2010 | 11:08 AM
  #133  
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You both have a pumpkin from the same year vehicle...I bet your stub axles on those have different teeth and therefore the readings are not accurate.

Your CC should work fine since you both have the newer style TCM. Speedometer goes off the stub axles in the rear - I'll bet you money that is your problem.
 
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Old Nov 18, 2010 | 11:36 AM
  #134  
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Originally Posted by Jeff92se
This was the 1st thought about why his CC doesn't work
If this is the case, would it be possible to somehow falsify a signal so that the ECU will not disable CC?
 
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Old Nov 18, 2010 | 11:57 AM
  #135  
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Toll, awesome theory. I makes alot of sense.
 
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