700r4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nevada70chev · 07-26-2002, 09:57 AM

how many of you had installed the 700r4? was it worth it? mpg increase? cost? problems? other info? thanx

Mixup · 07-26-2002, 10:13 AM

Mine was an easy install because my 350 was the same length as the 700R4 but I love it. I can even hear the radio cruisin" down the freeway with 3:70 gears. I haven't checked the mileage but it's alot better.

'72 Cheyenne Super · 07-26-2002, 10:24 AM

I installed a 700R4 behind a BB in my 4x4. Moved the motor forward 1-3/4" to make room for the extra length (piece of cake). TV cable is a bit of a pain to set up, and the shifter takes some monkeying (that's if you stick with the stock, linkage type shifter arrangement. I'm going to switch to a cable soon.). Otherwise, the deeper first gear makes for some quick launches (I'm running 3.73:1 gears and 33" tall tires), and the OD is a Godsend on the freeway. For me, it was worth the effort. Just be sure to install trans pressure and temp gauges, and make sure there's adequate cooling.
Can't give you any real definitive numbers on mileage because I don't drive it daily, anymore. And when I do drive it, I'm usually flogging the p*ss out of it! I think I checked it on a trip over the mountains, once, and I averaged close to 12mpg. I figure that's pretty good, considering the motor's pumped, and I drive 90mph with my hair on fire.

Blue68 · 07-26-2002, 10:51 AM

Hair on Fire!!! lol...Now I know what the chrome fire extinguishers are for....

The 700r4 is a nice modification for these old trucks, especially if you are running low gears (high numerically) and doing any type of cruising. If it is a tow truck, work truck or serious drag truck, it may not be worth the effort and expense.

As for mileage increase, keep in mind that the newer trucks with overdrive and fuel injection still only get about 16/20 mpg. My dad had a '69 C10 with a 283/350 combo that we could get 14 mpg out of about 20 yrs ago. It boild down to how much highway driving you'll be doing and how easy you are on the gas. I wouldn't count on more than maybe 2mpg bump regardless.

The benefit is cruising and the lower first gear. If you get better mileage, great. Check out www.700r4.com for more answers to 700r4 FAQs.

Just my opinion.

07-26-2002, 09:57 AM	#1
nevada70chev Registered User Join Date: Jul 2001 Location: reno, nv Posts: 646	700r4 how many of you had installed the 700r4? was it worth it? mpg increase? cost? problems? other info? thanx __________________ 70 LWB, 350/350 A/C, P/S, 3 Tone Paint (white cap, primer gray with black guide coat)

07-26-2002, 10:13 AM	#2
Mixup Registered User Join Date: Jan 2002 Location: Henderson, NV Posts: 358	Mine was an easy install because my 350 was the same length as the 700R4 but I love it. I can even hear the radio cruisin" down the freeway with 3:70 gears. I haven't checked the mileage but it's alot better. __________________ 1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350

07-26-2002, 10:24 AM	#3
'72 Cheyenne Super Registered User Join Date: Feb 2002 Location: Puyallup, WA USA!! Posts: 85	I installed a 700R4 behind a BB in my 4x4. Moved the motor forward 1-3/4" to make room for the extra length (piece of cake). TV cable is a bit of a pain to set up, and the shifter takes some monkeying (that's if you stick with the stock, linkage type shifter arrangement. I'm going to switch to a cable soon.). Otherwise, the deeper first gear makes for some quick launches (I'm running 3.73:1 gears and 33" tall tires), and the OD is a Godsend on the freeway. For me, it was worth the effort. Just be sure to install trans pressure and temp gauges, and make sure there's adequate cooling. Can't give you any real definitive numbers on mileage because I don't drive it daily, anymore. And when I do drive it, I'm usually flogging the p*ss out of it! I think I checked it on a trip over the mountains, once, and I averaged close to 12mpg. I figure that's pretty good, considering the motor's pumped, and I drive 90mph with my hair on fire. __________________ '72 Cheyenne Super 4x4, 468ci, 700R4, Import Stomper. A couple pics at http://www.picturetrail.com/gallery/view?p=6&uid=529895&

07-26-2002, 10:51 AM	#4
Blue68 Registered User Join Date: Apr 2000 Location: Frisco, Tx, USA Posts: 606	Hair on Fire!!! lol...Now I know what the chrome fire extinguishers are for.... The 700r4 is a nice modification for these old trucks, especially if you are running low gears (high numerically) and doing any type of cruising. If it is a tow truck, work truck or serious drag truck, it may not be worth the effort and expense. As for mileage increase, keep in mind that the newer trucks with overdrive and fuel injection still only get about 16/20 mpg. My dad had a '69 C10 with a 283/350 combo that we could get 14 mpg out of about 20 yrs ago. It boild down to how much highway driving you'll be doing and how easy you are on the gas. I wouldn't count on more than maybe 2mpg bump regardless. The benefit is cruising and the lower first gear. If you get better mileage, great. Check out www.700r4.com for more answers to 700r4 FAQs. Just my opinion. __________________ http://home.comcast.net/~r.landrum/w...tos.html-.html '68 C-10 LWB, '98 Z-71 350 w/accessories (Serpentine), Edelbrock Performer, Edelbrock 1405 (600cfm) carb, GM HEI, CompCam Extreme 4x4 roller cam, Thorley Headers, Carter Electric Fuel Pump, Vintage Air, 700r4, 3.73, disc brakes and power steering upgrades.



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