Acceptable converter slippage?
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Joined: Jun 2001
Posts: 920
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From: Saskatchewan
Car: 1986 Iroc
Engine: 454 Demon 850DP
Transmission: TH350, 3500 stall
Axle/Gears: 3.73
Acceptable converter slippage?
I think my converter may be slipping more than it should be. It is a B&M 3500 stall in my TH350.
Going through the traps at 111.611 mph the tach was at 5700rpm. I have 3.73 gears and I am running 28X13.5 ET Streets.
By the calculator on this site I shouldn't be near that rpm at that speed.
Going through the traps at 111.611 mph the tach was at 5700rpm. I have 3.73 gears and I am running 28X13.5 ET Streets.
By the calculator on this site I shouldn't be near that rpm at that speed.
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Joined: Jul 1999
Posts: 17,262
Likes: 168
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
My calculations put it at 12.355%. I don't know what's acceptable but anything under 10% I feel is good. As a comparrison, my converter data for this year had 7% slippage. It's possible the tranny itself is slipping too.
29.9" tall tire
4.56 gears
crossing the finish line at 7150 rpm at just under 130 mph
29.9" tall tire
4.56 gears
crossing the finish line at 7150 rpm at just under 130 mph
Last edited by AlkyIROC; Jul 2, 2005 at 05:51 PM.
Thread Starter
Senior Member
Joined: Jun 2001
Posts: 920
Likes: 0
From: Saskatchewan
Car: 1986 Iroc
Engine: 454 Demon 850DP
Transmission: TH350, 3500 stall
Axle/Gears: 3.73
Thanks Stephen, the B&M converter in there now is a low cost white box version. I have another 3500 stall here so I think I will swap them and see if that makes a difference.
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