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GRADYS Performance · 02-26-2015, 03:36 PM

If you are going to keep the truck and want better mileage update it to a 4L80E transmission with overdrive and a lock up torque converter. If you spend any money on the TH400 other than a shift kit and filter change you would be much better off spending the money on the 4L80E swap. Transmission cooler and cooling pan are good ideas for any Heavy duty transmission.

02-26-2015, 03:36 PM	#6
GRADYS Performance Registered User Join Date: Dec 2013 Location: Columbus, Oh Posts: 367	Re: 1987 GMC R3500 dually with th400 If you are going to keep the truck and want better mileage update it to a 4L80E transmission with overdrive and a lock up torque converter. If you spend any money on the TH400 other than a shift kit and filter change you would be much better off spending the money on the 4L80E swap. Transmission cooler and cooling pan are good ideas for any Heavy duty transmission.