The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Suburban K20 1986 Silverado

Edahall · 06-11-2012, 06:41 AM

You really lucked out on the drivelines fitting. Apparently, the TH400 and 700R4 are very close in length.

The new NP208 very well may be leaking out of the output shaft.

Did you install brackets on your engine for the TV cable? And did you get it all hooked up and adjusted? Getting it adjusted correctly is very important for keeping this tranny alive.

Another alternative is to use a switch in the cab to toggle the lock up torque converter.

9 to 12.23 mpg is huge 36% difference. Is this on propane? The compression ratio on a stock 350 is a little low for getting the best fuel economy out of propane.

06-11-2012, 06:41 AM	#144
Edahall Registered User Join Date: May 2011 Location: Goliad, TX Posts: 672	Re: Suburban K20 1986 Silverado You really lucked out on the drivelines fitting. Apparently, the TH400 and 700R4 are very close in length. The new NP208 very well may be leaking out of the output shaft. Did you install brackets on your engine for the TV cable? And did you get it all hooked up and adjusted? Getting it adjusted correctly is very important for keeping this tranny alive. Another alternative is to use a switch in the cab to toggle the lock up torque converter. 9 to 12.23 mpg is huge 36% difference. Is this on propane? The compression ratio on a stock 350 is a little low for getting the best fuel economy out of propane. __________________ 1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift Last edited by Edahall; 06-11-2012 at 06:59 AM.