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11-18-2003, 12:21 PM
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#1 |
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Registered User
Join Date: Apr 2002
Location: Manitoba, Canada
Posts: 663
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Power and Rear End Ratios
I'm OK with engines, I can do basic stuff with transmissions, but rear differentials are still a mystery to me.
I want to do about 400 horsepower and run an TH700-R4 (or a different GM overdrive?) transmission. I'm not a racer, but lets face it, I like horsepower. What is the best rear end ratio to go with? In which vehicle can I find a 5 bolt rear end that will work in my truck? 
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Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said. |
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11-18-2003, 12:51 PM
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#2 |
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Registered User
Join Date: Nov 2002
Location: Auburn, CA
Posts: 32
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I've always 3:73s with the od trannies, but it really depends on a ton of variables.
What do want the truck to do? What size tires will you be running?
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Just remember, everything has two edges. |
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11-18-2003, 02:06 PM
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#3 |
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Try spinnin 4 rear tars
Join Date: Sep 2003
Location: Salt Lake City, Utah
Posts: 757
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I agree with DoubleBit, 3.73 would be a good all around ratio. If you do more pulling/hauling/in town driving, a 4.10 would be a better choice.
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SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB |
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11-18-2003, 02:28 PM
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#4 |
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Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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I third the 3.73
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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11-18-2003, 03:52 PM
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#5 | |
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Senior Member
 
Join Date: May 2002
Location: Hammond, WI
Posts: 1,795
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i'm going with a 3.40 for the rear end in mine. no overdrive, though, TH350. 400 hp and 420 ftlbs of torque
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Mike 2001 Dakota R/T - Silver CC - 1 of 1671 •360 w/46RE •392 limited slip 1972 Chevy Suburban - Turquoise/Black 1969 Chevy C/10 - Blue LWB •350 w/ 700R4 •3.73 posi •PS PB A/C - SOLD  Using your turn signal is not "giving information to the enemy" 67-72 FAQ Quote:
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11-18-2003, 08:40 PM
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#6 |
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Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,891
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mine are here waiting for install
I bought a used posi and a new 3.73 gear I have a pretty nice vortec 350 with a zz4 cam and a turbo 350 with a small stall. I intend to use my truck for street and strip.
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Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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