convert to automatic trans - ZR-1 Net Registry Forums

Hog · 12-04-2012

The higher the stall speed on a TC allows allows for less rpm drop during upshifts.

I was running a stock TC that during a WOT 5500rpm upshift would result in 3800rpm in 2nd gear. After swapping to a 1996 L36 V6 S-10 DCLF code torque converter, the same WOT 5500rpm shift woudl result in 4300rpm. Acceleration was much improved through the shifts instead of acceleration seeming to hesitate slightly, this was in a 4000 lb reg cab shortbox Vortec 350 truck with 4.10 gears.
With the stock 350 TC I could brake stall to 2000 rpm, with the V6 TC I could brake stall to 2800-2900 rpm.

Another negative with the 4l60e/65e/70e is the huge rpm drop between gears. This is only worse in the 6l80e/6l90e transmissions with their deep 4.02:1 1st gear.

You can swap gears of a 4l80e, but they are big bucks and there are fitment issues. FLT had to ship the gears back and forth to finally get them to fit correctly in a 4l80e.

peace
Hog

12-04-2012	#17
Hog Join Date: Jul 2010 Location: Woodstock, Ontario, Canada Posts: 1,274	Re: convert to automatic trans The higher the stall speed on a TC allows allows for less rpm drop during upshifts. I was running a stock TC that during a WOT 5500rpm upshift would result in 3800rpm in 2nd gear. After swapping to a 1996 L36 V6 S-10 DCLF code torque converter, the same WOT 5500rpm shift woudl result in 4300rpm. Acceleration was much improved through the shifts instead of acceleration seeming to hesitate slightly, this was in a 4000 lb reg cab shortbox Vortec 350 truck with 4.10 gears. With the stock 350 TC I could brake stall to 2000 rpm, with the V6 TC I could brake stall to 2800-2900 rpm. Another negative with the 4l60e/65e/70e is the huge rpm drop between gears. This is only worse in the 6l80e/6l90e transmissions with their deep 4.02:1 1st gear. You can swap gears of a 4l80e, but they are big bucks and there are fitment issues. FLT had to ship the gears back and forth to finally get them to fit correctly in a 4l80e. peace Hog