Transmission upgrade question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*SMiller* · 02-08-2010, 03:30 PM

Keep the TH400 you have now and install a gear vendors over drive (google search this) or install a built 4L80E with stand alone controls. You could also go the hard way and install a 8.1\Allison combo, good mileage and power.

The nice part about any other trans. is a low first gear to get going and the tall over drive to cruise in, the 400 has pretty crappy gear ratios, but we love it! Man up and keep putting gas in it, your mileage will be complete crap with 37's anyways, might as well have a trans that will take the abuse!

02-08-2010, 03:30 PM	#3
SMiller Account Suspended Join Date: Jun 2009 Location: Tipton IN Posts: 81	Re: Transmission upgrade question Keep the TH400 you have now and install a gear vendors over drive (google search this) or install a built 4L80E with stand alone controls. You could also go the hard way and install a 8.1\Allison combo, good mileage and power. The nice part about any other trans. is a low first gear to get going and the tall over drive to cruise in, the 400 has pretty crappy gear ratios, but we love it! Man up and keep putting gas in it, your mileage will be complete crap with 37's anyways, might as well have a trans that will take the abuse!



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