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Transmissions and Drivetrain Need help with your trans? Problems with your axle?

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Old 07-16-2009, 11:11 AM   #1
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Join Date: Apr 2008
Location: Dumfries, VA
Posts: 1,298
Car: 1985 Z28
Engine: 310 Bolt-On TPI
Transmission: Full Manual 700R4 / TSI 2800 Stall
Axle/Gears: 3.73 Eaton, Moser, Richmond & More

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Is This Normal?

I had 600HP built 700R4 and boss hog 2800 stall converter put into my car.

I noticed in second and third gear when at cruising speeds, if you punched the throttle when the engine was running below the stall speed, the engine would jump to 4k then immidiately fall back down to 3k and grab.

I thought it was tranny slip at first but I called and talked to the torque converter company and they said it is because the engine is being revved below the stall speed and the converter has to play catch up. It sounded feasable since this does not occur if the throttle is punched when the engine is at or above stall speed. I just wanted to see what everyone else here thought.
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Old 07-16-2009, 02:51 PM   #2
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Join Date: Oct 2008
Location: Logan, UT
Posts: 5,261
Car: '84 Trans Am WS6
Engine: LQ9 w/ Wegner LS6 heads
Transmission: 4L60E, seeking good used NV3550HD
Axle/Gears: 7.5" 3.23:1, posi, swapping to 8.5"

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Re: Is This Normal?

Something sounds wrong. Going full throttle should cause a downshift, which should get your engine rpm high enough. Does your combo retain converter lockup? If so, is the converter locking up when cruising?
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Old 07-16-2009, 02:52 PM   #3
On Probation
 
Join Date: Oct 2008
Location: Logan, UT
Posts: 5,261
Car: '84 Trans Am WS6
Engine: LQ9 w/ Wegner LS6 heads
Transmission: 4L60E, seeking good used NV3550HD
Axle/Gears: 7.5" 3.23:1, posi, swapping to 8.5"

Classifieds Rating: (0)
Re: Is This Normal?

Also, you need a 3.73:1 axle for a 2800 converter. I have plenty of experience with too-tall gearing with too-loose converters.
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Old 07-16-2009, 03:01 PM   #4
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Join Date: Apr 2008
Location: Dumfries, VA
Posts: 1,298
Car: 1985 Z28
Engine: 310 Bolt-On TPI
Transmission: Full Manual 700R4 / TSI 2800 Stall
Axle/Gears: 3.73 Eaton, Moser, Richmond & More

Classifieds Rating: (0)
Re: Is This Normal?

I was holding third gear the whole time and not allowing the trans to go into overdrive, so there was nothing to downshift to. Also, I didn't do WOT. I gave it about 3/5 throttle and my rear gears are 3.23.

How do I verify that the converter is locked?
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Old 07-16-2009, 03:01 PM
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