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10-06-2015, 09:41 AM
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#26 |
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Registered User
 
Join Date: Sep 2015
Location: Lake Balboa California
Posts: 95
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Re: Choice of tranny effect mileage???
WOW!!! I am overwhelmed with the information coming from this group. I feel empowered with this much knowledge in one group. I was hesitant to take this project on, but my confidence has skyrocketed due to my association with this group. I look forward to many years with this truck. Thanks all!!!!
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Larry 1970 Chevy Pickup C-10 Dodger Blue 305CI/Th400 auto trans Long Bed/Rally Wheels |
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10-07-2015, 09:31 AM
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#27 |
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Senior Member
Join Date: Jun 2014
Location: Bushwood, MD
Posts: 510
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Re: Choice of tranny effect mileage???
So my experience with my '71 Cheyenne Super long bed is -
350 SB, 400 Turbo, 4.11 rear = 12.5 hwy mpg Same drivetrain, no changes but installed 700R4 = 18 hwy mpg Love it! Blew 3rd in the turbo 400 so had to change it anyway... Randy |
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10-07-2015, 11:54 AM
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#28 |
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Registered User
Join Date: Sep 2015
Location: Lake Balboa California
Posts: 95
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Re: Choice of tranny effect mileage???
The three speed tranny in my truck is slipping when cold. It is at the shop and they are going over the truck to look for anything I missed. If the tranny is in need of replacement, then 700R4 is next on my list
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Larry 1970 Chevy Pickup C-10 Dodger Blue 305CI/Th400 auto trans Long Bed/Rally Wheels |
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10-07-2015, 08:54 PM
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#29 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,714
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Re: Choice of tranny effect mileage???
TH200 saves from having to shorten the driveshaft, and it doesn't have the ridiculous gear split between first and second. Consider that before you spend your money.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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10-08-2015, 08:11 PM
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#30 |
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Registered User
Join Date: Feb 2009
Location: Southern Oregon
Posts: 1,352
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Re: Choice of tranny effect mileage???
Like others have said, dont expect miracles here. Any milage above 15 mpg should be considered excellent. I think 12 mpg at 70 mph is pretty good. A overdrive should help but will also make a much more pleasant commute due to less noise. It will also add value should you ever decide to sell.
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1967 C10 Suburban 454/TH400/3.07's An Average Joe and His 'Burb: http://67-72chevytrucks.com/vboard/s...d.php?t=775843 |
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10-08-2015, 08:14 PM
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#31 |
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Senior Member
 
Join Date: Jan 2011
Location: Chattanooga TN
Posts: 6,205
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Re: Choice of tranny effect mileage???
I'd get it running really clean, drive it for a while and make sure everything else is ok, then drop the $ on the trans.
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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10-08-2015, 08:16 PM
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#32 |
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Registered User
Join Date: May 2014
Location: PA
Posts: 1,417
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Re: Choice of tranny effect mileage???
My '67 250 3 speed gets 17mpg highway going 70mph. Not sure what gears are in it but it's right about 3000rpm.
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1967 C10, LWB, 250, Powerglide, PS, PB, 3/4 STATIC DROP |
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