The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Got a 6.2 diseasal... should I put a 700r4 or a Turbo400 behind it?

rcbildr · 06-08-2012, 08:54 PM

I would stick with the TH-400. I have an 85 diesel burb with the th-400 and it has 4.10 gears with 35" tires and I easily get 18-20 mpg. I managed to break a 700R4 in my diesel truck (trucks gone now tho) and the tranny was supposedly built to the hilt. A while back I also had an 82 2wd diesel burb with 4.10 gears and stock tires and was getting 20-22 mpg. I would think with your gears, the mileage would be decent. I wouldn't use the 700R4 in a truck/burban I would always be wondering/worrying about how long it would last.

06-08-2012, 08:54 PM	#4
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Re: Got a 6.2 diseasal... should I put a 700r4 or a Turbo400 behind it? I would stick with the TH-400. I have an 85 diesel burb with the th-400 and it has 4.10 gears with 35" tires and I easily get 18-20 mpg. I managed to break a 700R4 in my diesel truck (trucks gone now tho) and the tranny was supposedly built to the hilt. A while back I also had an 82 2wd diesel burb with 4.10 gears and stock tires and was getting 20-22 mpg. I would think with your gears, the mileage would be decent. I wouldn't use the 700R4 in a truck/burban I would always be wondering/worrying about how long it would last. __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28