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73-87 Chevy _ GMC Trucks => Suburbans => Topic started by: Creeper on January 05, 2002, 11:45:00 am

Title: which way to go......
Post by: Creeper on January 05, 2002, 11:45:00 am

Hi, I think this is a great site. Nice to see some stuff on the 'forgotten' chevies. I could use some advice.I'm building a 84 suburban, 350, 700r4 or T350-I,m not sure yet, 3:08 diff, headers to dual flowmasters, K-N filter set up with dual air intake. What do ya think will be my best route to gettin some "descent" fuel economy. Any tricks or opinions.? I will be doin about 50/50 city-hwy.

Thanx.

Title: Suburban ?
Post by: 79crewcab on February 02, 2002, 10:41:00 am

I think the best way to go is with the 700R4.  Your gearing may be little too high depeding on the tire size.  You'll love the overdrive.  When your all done you want the Rig to cruise at about 2100 rpm at 70mph.  There are places on the net that have the calculations you need to figure this out depending on tire size, gear ratio, etc. Go to "Bowti Overdrives", they will give you some more info.  The super duty way to go is with a Gear Vendors gear splitter. It come with about a 22% OD and will last forever but is expensive.

Hope this helps,
Bill

Title: also, for the 700r4
Post by: stan on March 15, 2002, 03:24:00 pm

While you're working the 700r4 get a late (post 90) or add the 4th gear shift delay valve (B&M), it'll allow you to hold 4th with more throttle (you'll want a little low-end torque fromt the engine, but it'll do) -- pay close attention to your carb -- a OEM Q-jet with a mild secondary should get you fine mileage --  my '85 gets 12mpg mostly city --

Another "fun" part of the r4 is the 3.06:1 1st gear - set your idle correctly or the tranny will hit second gear before you roll off-stop!

Title: 700r
Post by: guestuser on July 27, 2002, 01:35:00 am

Make sure you use a 67 to boost your 220 which will enhance your 700r

Title: Re: 700r
Post by: 79GMC4x4 on August 07, 2002, 11:20:00 am

Very funny...

'79 GMC shortbed 454 th400 14 bolt FF NP205 Dana 60

Title: CONVERSION
Post by: RAYMOND on August 27, 2002, 01:39:00 am

IF ITS MILAGE YOU WANT, GOT TO THE 6.2 DIESEL WITH THE 700R4/TRANSGO. MY 83 6.2 BURBAN GETS 28 MPG HIGHWAY, AND 23 PUTTING AROUND. NOT MUCH ON THE ACCEL BUT YOU GET USE TO THE MILAGE. I JUST BOUGHT A 96 6.5 TURBO DIESEL AND THE ACCELERATION IS IMPRESSIVE, BUT THE MILAGE IS ONLY 17

Title: Re: CONVERSION
Post by: Kevin108 on August 31, 2002, 07:22:00 pm

And a new starter is $250, right?     I think it's cheaper to own a gasoline-powered rig.

87 Silverado 4x4 Longbed Pickup
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Title: Re: CONVERSION
Post by: Eric 85K10 on October 21, 2002, 07:57:00 pm

"And a new starter is $250, right?  I think it's cheaper to own a gasoline-powered rig."

haha yeah, those 6.2s and there starters