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04-04-2007, 04:01 PM
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CC Member
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Join Date: Aug 2003
Location: Gilbert,
AZ
Cobra Make, Engine: Backdraft #90, 351w,Tremec 3550, SB100 SOLD
Posts: 577
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Not Ranked
Tremec 3550 shifting problem
Anyone else out there with a 3550 that doesn't like to be downshifted from 5th to 4th? Mine sometimes will go in smoothly, and at other times it just refuses to do so despite multiple attempts. I often have to slow down a bit and go into 3rd before I can go back into 4th. Any ideas (other than driver error!) about what is wrong and can be done about this?
Skip B
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04-05-2007, 09:36 AM
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CC Member
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Join Date: Feb 2006
Location: Ft. Worth,
Tx
Cobra Make, Engine:
Posts: 257
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Not Ranked
Sounds like your sycro is worn for 4th gear, how many miles are on the transmission, or is it a new installation? jimig@standardtransmission.com
__________________
True friendship is like peeing your pants, everyone can see it, but only you can feel its warmth.
Plan your life like you will live to be 120 years old...Live your life like you could die tomorrow.
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04-05-2007, 10:28 AM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
Can we assume the fluid is as recommended and the level is proper?
Bob
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04-06-2007, 04:18 PM
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CC Member
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Join Date: Aug 2003
Location: Gilbert,
AZ
Cobra Make, Engine: Backdraft #90, 351w,Tremec 3550, SB100 SOLD
Posts: 577
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Not Ranked
Guys,
Thanks for the replies. The transmission only has about 3K on it and was checked for proper fluid level not too long ago. The only thing I can think of that may not be right was that when it was first installed, the trim ring/boot around the shifter was installed while the car was in gear. So, when it was in 2nd or 4th gear, it would slip out of gear from the pressure of the boot pushing on it. I reinstalled it (moved it backwards) when the lever was in neutral and the "popping out of gear" problem went away. I am not sure if this would have an effect on syncros or caused some other problem to eventually develop into this one. Other than that, it works great in all the gears with only a problem with "grinding" when downshifting from 5th to 4th. I should also say that it doesn't happen all the time, just most of the time!
SkipB
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04-06-2007, 04:54 PM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Evans,
CO
Cobra Make, Engine: NAF 289 FIA, 347 stroker with Weber 48's, building a '48 Anglia gasser, driving a '55 Chevy resto-rod
Posts: 3,119
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Not Ranked
I lost my 4th gear synchro twice in my 3550, started grinding 3rd to 4th and 5th to forth. I always had shifting issues with this particular trans...bad mfg run? I don't know?
After spending about $800 in time and material to rebuild it after running it for 2yrs then have it fail again ....hmmm
__________________
"Breathe in... Breathe out... then move on with life. Lifes too short to sweat the small stuff"
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04-07-2007, 05:58 PM
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CC Member
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Join Date: Aug 2003
Location: Gilbert,
AZ
Cobra Make, Engine: Backdraft #90, 351w,Tremec 3550, SB100 SOLD
Posts: 577
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Not Ranked
Well, today I took my car out for a run and repeatly shifted from 4th to 5th and back again many times with no problems at all! So, I am confused. It must be my driving or a shifting gremlin! I have driven probably over a million miles in cars with 5 speeds and never had this happen before. So, I will try it again tomorrow and see what gives. I'm thinking about have a couple of tequilas tonight, so let's see what that does to my shifting!
SkipB
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11-23-2011, 03:21 PM
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Registered User
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Join Date: Jun 2011
Location: Paris,
FR
Cobra Make, Engine: Cobra SPF 351W
Posts: 1
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Not Ranked
HiSkipB,
I have a SPF 351w with a Tremec 3550 with similar shifting problems especially on 2nd and 4th gear (slipping).
How did you definitely solve yours ?
Thanks
LF
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11-23-2011, 11:26 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
This thread is 4 1/2 years old.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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11-24-2011, 07:42 AM
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CC Member
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Join Date: May 2003
Posts: 1,313
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Not Ranked
I had similar problems with my 3550. I replaced the fluid with straight 40w synthetic motor oil. That was several years ago. It has been fine since. |
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