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01-09-2011, 07:27 PM | #1 |
Building Dreams out of Dimes!
Join Date: May 2005
Location: Bonham, Tx
Posts: 892
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4 wheel drive set up good or bad? sb400 700r4 4:11 gears
Hey guys I'm looking at buying a suburban and swapping out the engine in it with my sb400. MY sb400 will make around 580lbs of torque at 9.5:1 compression, according to are rough estemations.
So the setup will be: 1985 Chevy Suburban 4x4 8" Lift (all suspension) 38" Tires sb400 (580lbs of torque) 700r4 (he said it has kevlar clutches) 4:11 gears Well do you guys think it will be okay? (not sure what kind of transfer case or torque converter) Thanks! |
01-09-2011, 09:01 PM | #2 |
I built it
Join Date: Sep 2008
Location: Bakersfield ca
Posts: 744
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Re: 4 wheel drive set up good or bad? sb400 700r4 4:11 gears
with 38" tires I would put in more gear then a 4.11.. 4.56 absolute minimum imo
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01-09-2011, 11:01 PM | #3 |
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Location: Binghamton, NY
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Re: 4 wheel drive set up good or bad? sb400 700r4 4:11 gears
if indeed he is making that much torque, he won't need a steeper gear. He will need a better tranny and t-case, like a 4-speed or 400 and a 205 case.
How do you figure your motor is making that much torque??
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
01-10-2011, 11:07 AM | #4 | |
Building Dreams out of Dimes!
Join Date: May 2005
Location: Bonham, Tx
Posts: 892
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Re: 4 wheel drive set up good or bad? sb400 700r4 4:11 gears
Quote:
Kind of off topic here. If you want you can PM me. I was wondering about the gears too. It has 40" tires on it. |
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01-10-2011, 11:20 AM | #5 |
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Join Date: Dec 2010
Location: freeburg, illinois
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Re: 4 wheel drive set up good or bad? sb400 700r4 4:11 gears
i have a 91 3/4 burban on 38.5s with the stock tbi 350 and 4.10s and a 4l80e/np241 it does fine except for an occasional bog down but a new motor is coming in so im not worried about bogging anymore
Last edited by Mr. 250r; 01-10-2011 at 11:38 AM. |
01-10-2011, 11:27 AM | #6 |
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Join Date: Nov 2004
Location: Mt Airy, MD
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Re: 4 wheel drive set up good or bad? sb400 700r4 4:11 gears
Sounds like it'll work ok. Your gears will be in the mid-lower 3s after your tires,so that'll work fine for street.O/D may be a bit tall. 4.56s would probably be best. The transmission can be built to take it. 700r4/NP208s are pretty common,then came the N241 in '89. There are 4L80E/NP241 combos from '91 3/4 Suburbans and CrewCab 3/4 & 1 tons. You want to get the electronic speedo stuff from the donor,too. I think the same for the 90/91 700r4/N241s.
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