Trans question

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Can something in the trans cause 14% slippage? Turning 6000 rpm in the eighth at 98 mph. Thought convertor was bad, so I put in a new one. Still the same. According to Wallace calculator, I should only be turning about 5200

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Measure the circumference of YOUR rear tires and then do the math on how many feet per minute your running at the finish line If your running bias ply tires you might want to add 1 to 2.5 % to the circumference for tire growth If radial tires don't add anything more to the actual circumference Let us know what you find, tach errors and crummng converters can drive you absolutely NUTS Good luck

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It's a RMVB. What causes low line pressure? I don't know much about auto transmissions. Could bad clutches do this? Trans is only two years old.

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Being a RMVB your pressure is preset in the VB.. I
forget if you would have a throttle pressure on that..
I know the trans brake you dont get throttle pressure
and its locked... but I have the trans out of my Rampage
and between a bad shifter cable adjustment and low
throttle pressure it FRIED the low clutch(all the fiber
was gone)and it slipped

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Could bad clutches do this? Trans is only two years old.

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Just checked line pressure. Read 115 psi 3rd gear 2000rpm. Is this too low for a RMVB? Could this cause the clutches to slip?

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Maybe one of the trans guys will answer this .. but
I run 180 to 190

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Measuring it at line pressure outlet on right side. Trans man says it should be about 160 psi. Not sure of brand, but it is a reverse pattern manual w/ low band apply. Just wondering if low pressure could cause 14% slippage. Car launches good, but slips all the way down the track.

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The first custom built 8 inch race converter I bought and used in a "race car" was a Art Carr, it broke during the second run Bottom line was it was to loose, it would slow the car down .034 to .041 in ET and 3 to 4 MPH in the 1/4 mile over the stock 11 inch street hemi converter It would revved like crazy at the hit of the throttle, go to 6000 RPM and stay there for a while in 1st gear and then accelerate up to 7000 RPM on the shift points, it would drop back to 6000 RPM and lay there again for awhile before strting to gain RPM, it was a real turd My message is your converter may be no good like that one I've since had two more bad 8 inch converters like that, one TCI and one GER I've also had several very good converters from A-1, B&M, Rossi, Continental, Turbo Action and several other good comapnys. Buy the best race converter you can find Not the cheaper ones

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My converter slippage decreases during the run. It's much lower after a 1/4 mile than an 1/8th. Mine is about twice that at that point on a run, but I'm measuring it using engine rpm/driveshaft rpm.

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A 1/4 mile run has a lot more of pulling rpm than a
1/8 mile run and will show a lesser/better slippage rate