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#1 |
Registered User
![]() Join Date: Oct 2008
Location: Reno, NV
Posts: 472
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Tranny slips at the top of 2nd at wot and shifts all over the place
From 1st to 2nd gear at wot. How do I fix at home?
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'03 Automatic. No silencer, K&N FIPK, 3450# race weight, drag radials, cat back, custom tune, alum. driveshaft, intake spacer, raised scoop, underdrive pulleys, larger subframe connectors, synthetic engine oil, removed front sway bar, battery to trunk, 2.06 60', 12.99 @ 107.4 ![]() |
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#2 |
Registered User
![]() Join Date: Aug 2002
Location: Hughesville, Maryland
Posts: 594
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Re: Tranny slips at the top of 2nd at wot and shifts all over the place
Are you low on tranns fluid?
I got to know the 4r70W trans quite well recently (yours in a 4r75w i believe...same with some upgraded internals) Your 1-2 recuperator springs may be amiss. I installed the Perfromance Auto valve body upgrade in my son's 03 GT with the 4r70w. These springs play a critical roll and I upgrade mine with the valve bodyl. Your valve body could also be loose (I did not torque mine down properly and is showed the same symptoms you are having.) You need to take it to a shop that knows these trans. Your torque convertor may be giving up the ghost as well. Just my opinion. It's a place to start. WHen you figure it out, close the loop and post what was wrong.
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Aluminator NA bottom end, rebuilt stock heads, Vortech V2, 3.90 gear, 514 RWHP, 468 RWTQ. Motor and tune by JPC. (Millersville, MD) |
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#3 |
Registered User
![]() Join Date: Jun 2011
Location: Boone,NC
Posts: 405
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Re: Tranny slips at the top of 2nd at wot and shifts all over the place
Is it a good shift then a slip, or does it seem to "slip into gear" and never have a pronounced shift? If it shifts good and then slips you may be looking into a rebuild. If it is a sloppy shift that never really has a defined shift it could be a fluid/filter issue.
We run TransX(from NAPA) in all our higher mileage trans services, and anytime we have a issue. We do a flush or a filter/fluid change and add the TransX. Check your fluid and wipe the fluid on a paper towel. Put a few "dipstick samples" on the towel and hold it up, looking for any dark particles and "shiny stuff". |
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#4 | |
Registered User
![]() Join Date: Oct 2008
Location: Reno, NV
Posts: 472
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Re: Tranny slips at the top of 2nd at wot and shifts all over the place
Quote:
__________________
'03 Automatic. No silencer, K&N FIPK, 3450# race weight, drag radials, cat back, custom tune, alum. driveshaft, intake spacer, raised scoop, underdrive pulleys, larger subframe connectors, synthetic engine oil, removed front sway bar, battery to trunk, 2.06 60', 12.99 @ 107.4 ![]() |
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#5 |
Speed addict
![]() Join Date: Apr 2007
Location: Miami, FL
Posts: 648
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Re: Tranny slips at the top of 2nd at wot and shifts all over the place
Sounds more like the torque converter is not staying locked.
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Best time 1/8th mi--7.65@90MPH 2003 DSG Mach 1 99/01 Cobra front bumper Darrin-Matic w/3500 stall converter 100 Shot 4.10 Gears Stock Springs KYB AGX adjustable shocks/struts tubular LCAs UPR dbl adj UCAs Custom SCT Tune 255/40/18 front 295/35/18 rear FR500 Wheels Custom RAI UPR O/R X-Pipe Roy spacer Flowmaster 40's I may not be as good as I once was, but I'm as good once as I ever was." "Just an old man having fun" |
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#6 |
Registered User
![]() Join Date: Apr 2004
Location: FL
Posts: 1,951
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Re: Tranny slips at the top of 2nd at wot and shifts all over the place
That is what I was thinking also. Do you have a stock converter?
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2011 Kona Blue GT500 Stock for now 2004 MACH 1 Competition Orange (SOLD) 2007 Sport Trac Limited Oxford White V8 4X4 Magnaflow cat-back SCT XCalibrator 2 K&N Drop in Filter |
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#7 | |
Registered User
![]() Join Date: Jul 2008
Location: Texas
Posts: 906
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Re: Tranny slips at the top of 2nd at wot and shifts all over the place
Quote:
http://www.youtube.com/watch?v=J_gXM...baAUAAAAAAARAA
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JLT, xpipe, tune and the Darrinmatic and a lil bit of Sauce tuned by Lethal Performance in San Antonio TX |
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#8 | |
Registered User
![]() Join Date: Oct 2008
Location: Reno, NV
Posts: 472
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Re: Tranny slips at the top of 2nd at wot and shifts all over the place
Quote:
__________________
'03 Automatic. No silencer, K&N FIPK, 3450# race weight, drag radials, cat back, custom tune, alum. driveshaft, intake spacer, raised scoop, underdrive pulleys, larger subframe connectors, synthetic engine oil, removed front sway bar, battery to trunk, 2.06 60', 12.99 @ 107.4 ![]() |
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#9 | |
Registered User
![]() Join Date: Oct 2008
Location: Reno, NV
Posts: 472
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Re: Tranny slips at the top of 2nd at wot and shifts all over the place
Quote:
__________________
'03 Automatic. No silencer, K&N FIPK, 3450# race weight, drag radials, cat back, custom tune, alum. driveshaft, intake spacer, raised scoop, underdrive pulleys, larger subframe connectors, synthetic engine oil, removed front sway bar, battery to trunk, 2.06 60', 12.99 @ 107.4 ![]() |
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