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#1 |
Stylin
Join Date: Sep 2001
Location: Tuttle, OK
Posts: 620
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th350c to 700r4 trans swap help
ok ive got an 86 gmc 1/2ton 2 wheel drive truck with a 350 in it(with a edelbrock performer carb on it) and im wanting to swap it out for a 700r4 trans. ill be needing better mpg to get to work and some schooling. what rear end would ya'll recomend for this also. my gf is bout 8 1/2 weeks along so i need to get this done sometime soon plus this one is slippin and engageing late n hard as hell lol. but id like to hear ya'lls opinions, btw mom n dad are helping out with getting the 700r4 level2 from 700r4.com.
thanks Paul
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Ive been traveling for some time, with my fishin pole and my bottle of shyne. Most Girls like finished products and just dont understand what a good addiction does for you http://www.paulwall.us/ |
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#2 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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I vote for a 3.73 ratio. This is what I have and it works great. I can run down the interstate at 75 and around 2200 rpm. Works for me.
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Mike 1985 Chevy C-10 |
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#3 |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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Hey, Swerve...
How tall is the rubber on the rear of your truck? I want to crunch some numbers, but I need the diameter of your wheel/tire
combo ... Thanks! |
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#4 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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27 inches. Let me change my statement a tad.
I said 2200 rpm at 75. Won't compute. With 27 inch tires, 3.73 gears and the .7 OD, it will be more like 2400 rpm at 75 mph. With a 28 inch tire you would be around 2200 rpm at 70. Then take into consideration of the lockup. This will lower the rpm around 200 rpm or so. This is where I come up with 2200 rpm at 75. Last edited by swervin ervin; 02-13-2004 at 11:25 AM. |
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#5 |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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Too cool!
Thanks for the info. Definitely sounds like the 700R4 is the way to go as far as the transmission goes. What kind of mpg are you getting? |
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