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Old 05-30-2005, 11:37 AM
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Torque Converter Problem?

I have a 350 chevy engine (ZZ4) with a TH350 Trans and a TCI Saturday Night Special torque converter. The Trans has a B&M shift kit.

My problem is that I have 3:08 9" ford rearend in a 3200 pound car and according to all the calculators I should run 2455 RPM at 65 MPH. I pulled the rear out this weekend and counted teeth on the pinion and the ring gear. (13 Pinion and 39 Ring).

The car runs great, shifts good but the performance isn't as good as I think it should be.

I currently run ~3200 RPM @ 65 MPH, 2000 RPM @ 40 MPH etc. Could this be a problem with the torque converter slipping to much?

I am considering switching to a stock coverter but I am unsure what the problem is.

Thanks for any help you could give me with this.
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Old 05-30-2005, 01:03 PM
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rpm!

Dumb question= Does your trans have an overdrive gear? You should be humming along give or take at about 2000 rpm at highway speeds.
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Old 05-30-2005, 01:13 PM
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Quote:
Originally Posted by 38project
I currently run ~3200 RPM @ 65 MPH, 2000 RPM @ 40 MPH etc. Could this be a problem with the torque converter slipping to much?

.

Possible.................I have 3.55s with a T350 and am running about 3000 at 65.

Are you sure the speedo is calibrated right?

How does it seem to grab when you get into it?
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Old 06-01-2005, 10:20 AM
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Yes, I have calibrated Spedo. I am possibly off by 2-3 mph.

According to my calculations:

Tire size=27.4 dia Rear Gear=3.25 Trans final ratio=1 Speed=65

RPM should be = 2590

But I run 3200
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Old 06-04-2005, 06:04 AM
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It sounds like it could be the converter, do you know what the stall is supposed to be? What do you see for revs when you goose the gas with the brakes on?

Double check your calculations and counting one more time...

13 pinion and 39 ring is 3.00 not 3.08, and I don't think we made a 3.00 (bet you have 40 ring gear teeth)
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Old 06-05-2005, 02:21 AM
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tranny fluid

If your tranny fluid level is down. You will run at higher RPM.
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