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08-25-2011, 12:06 AM
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#1 |
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Registered User
Join Date: Dec 2010
Location: auburn ne
Posts: 230
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th350 vs sm465
so as of right now my truck has the sm465 and 205 combo. but today i ran across a good deal on a 350 trans and 205 combo and trying to decide if i really want to go back to and automatic or not, but real question is is whats the difference in length if any and whats your opinioins on the pros and cons of each.?
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85 GMC sierra classic : 350, 4spd, 205, 3.42s, 35s 
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08-25-2011, 09:24 AM
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#2 |
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Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,189
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Re: th350 vs sm465
Stay away from 350. Unless you are upgrading to an overdrive automatic it is not a good swap. 700R4 or newer is the only swap worth doing, and I would still keep the SM465.
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08-25-2011, 11:55 AM
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Conversion Truck Addicted
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
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Re: th350 vs sm465
sm465 all the way
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Thomas Quote:
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08-25-2011, 12:04 PM
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#4 |
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Registered User
Join Date: Dec 2010
Location: auburn ne
Posts: 230
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Re: th350 vs sm465
well i love the sm465 for the reliability and all but and automatic would be nice at times, is what i was thinking. but ive never had good luck with automatics in this truck thats why i went to a 4spd in the first place lol so maybe i should just leave it like it is. plus would save alot of work. but $75 for a 350 and 205 is just hard to pass up lol.
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85 GMC sierra classic : 350, 4spd, 205, 3.42s, 35s
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08-25-2011, 01:01 PM
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#5 |
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Registered User
Join Date: Dec 2010
Location: Pittsburgh, PA
Posts: 1,009
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Re: th350 vs sm465
For that price, buy it and re-sell it. Keep your setup, it's much more reliable in the long run.
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Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400 
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08-25-2011, 11:35 PM
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#6 |
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Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Re: th350 vs sm465
350s aren't that strong and have no overdrive if you went to an automatic TH400 be way better but I say you still stick with the sm465 cause they rock!
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*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold  -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit   -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER  I would rather push a Chevy then drive a ford!!
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08-26-2011, 04:07 AM
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#7 |
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Registered User
Join Date: Dec 2010
Location: auburn ne
Posts: 230
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Re: th350 vs sm465
ok what makes a th400 better than a th350?and im not a fan of overdrives at all unless you spend enough money to make up for all the factory flaws lol but ive never really understood what makes a th400 so great? and dont get me wrong i love my 4spd for about everything but sometimes the autos are nice.
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85 GMC sierra classic : 350, 4spd, 205, 3.42s, 35s
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08-26-2011, 12:47 PM
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#8 | |
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Registered User
Join Date: May 2011
Location: Goliad, TX
Posts: 672
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Re: th350 vs sm465
Quote:
Pros: Strong Good power transfer Better fuel economy Cons: You have to shift TH350 Pros: Don't have to shift Cons: Weak Expensive to rebuild Loss of power from non lock up torque converter
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1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift |
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08-26-2011, 01:09 PM
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#9 |
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Registered User
Join Date: Dec 2010
Location: Pittsburgh, PA
Posts: 1,009
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Re: th350 vs sm465
TH400's are just stronger internally, also. Everything is much heavier duty. For a 2wd with stock tires or something, a stock TH350 will do just fine. For a 4x4 or anything with a built engine or bigger tires, etc. a TH400 is the way to go.
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Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400
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08-26-2011, 03:19 PM
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#10 | |
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Registered User
Join Date: Dec 2010
Location: auburn ne
Posts: 230
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Re: th350 vs sm465
Quote:
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85 GMC sierra classic : 350, 4spd, 205, 3.42s, 35s
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08-26-2011, 08:55 PM
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#11 |
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Registered User
Join Date: Aug 2011
Location: Newark Ohio
Posts: 122
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Re: th350 vs sm465
I believe the length is the same, I've seen th350's take alot of abuse. Th350's are easy and cheap to rebuild. Daily driving is alot different from towing, I like an auto for daily driving, but for heavy towing, in my dually I have a 465 and 205. With the 454 running, clutch out, posi's doing what they do, something WILL move. I'd buy it for your next project, it's an investment. Good luck, Ron
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