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09-18-2012, 09:07 AM
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#1 |
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Registered User
 
Join Date: Nov 2009
Location: farmington nm
Posts: 178
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Worth It.
I just rebuilt my th 350 and am wondering if I should have scrapped it and went with a th400. Is the fuel savings worth it? I have 3/4 ton axles with 4:11 gears and 35 inch tires and a 355 V8.
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09-18-2012, 09:41 AM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Alden NY
Posts: 2,705
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Re: Worth It.
A TH 350 and a TH400 both have 1:1 final drive ratio so there would be no fuel savings as the 400 is not an OD transmission. A 700R is an OD.
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1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7 |
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09-18-2012, 10:11 AM
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#3 |
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Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,567
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Re: Worth It.
If you have a 4wd then the th400 may require a different t-case or modification to your existing one. Also take a few more ponies to get going. I have a 406 700r4 and 205 and am very happy with results. You can always sell the th350 and get a 700r4. Or you could go for bigger and get a 4l80e with a th400 t-case and have bulletproof overdrive. Either case is pricey though..
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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09-20-2012, 02:06 AM
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#4 |
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urban fourwheelin
Join Date: Aug 2002
Location: Seattle
Posts: 1,007
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Re: Worth It.
All else being equal, you should get better mileage with the th350 as there is more parasitic loss with a th400 than a th350.
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1972 K5 Blazer with Cummins 4BT, NV4500 swap in the parts gathering stage. |
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09-20-2012, 04:11 PM
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#5 | |
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Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: Worth It.
Quote:
Hard to beat the durability of the 400 though if that's what you are looking for. |
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