400sbc with th350 tranny

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400sbc with th350 tranny

Postby mirage_brat » Wed Apr 13, 2016 1:30 am

Will a th350 tranny hold up to a mildy built 400sbc if so what would I need to use for a flexplate
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Re: 400sbc with th350 tranny

Postby Smiley » Wed Apr 13, 2016 3:19 am

A 400 smallblock (and 383) uses a unique external balance flywheel and harmonic balancer
400 flywheels are the larger 168 tooth size so a mini starter my be in order also.
If the TH350 is in good condition it should hold up to a mild 400. I would suggest a rebuild (new clutches and seals) as well as a shift kit.
If you run a higher than stock stall torque converter add an external trans fliud cooler.
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Re: 400sbc with th350 tranny

Postby mirage_brat » Wed Apr 13, 2016 6:13 am

i already had the tranny gone through with a shift kit, manual valve body, and a 2900 stall converter plus i have a mildly built 350 right now
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Re: 400sbc with th350 tranny

Postby spencerforhire » Wed Apr 13, 2016 7:19 am

You used to be able to buy a counterweight that bolted on the crank under the neutral balance 153 tooth flexplate. There's one in my old 76 GT with the 400, but I just searched the Summit website and couldn't find a listing.
The "fleet"-
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
03 Silverado 2WD ex.cab (work truck/parts hauler)
04 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
93 Suburban- 350/4L60(retired)
00 Saturn SW2- wife's car
01 Saturn SC2- younger son's project
00 Saturn SL2- daughter's car
98 Saturn SW2- spare
and 3 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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Re: 400sbc with th350 tranny

Postby Kenova » Wed Apr 13, 2016 10:28 am

Smiley wrote:A 400 smallblock (and 383) uses a unique external balance flywheel and harmonic balancer....


The correct damper and flywheel are an absolute must have. (Ask me how I know :bang: )
Without the proper damper and flywheel you are in for a world of hurt (and a broken trans housing).

Ken
My other car is a Nova.
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Re: 400sbc with th350 tranny

Postby Monza Harry » Wed Apr 13, 2016 3:47 pm

I remember those Spencer So I did a quick search, and at least found a few pic's, here is the whole search outcome. Harry https://ca.search.yahoo.com/search;_ylt ... orcl_hpset and the piece: http://shop.whiteperformance.com/400-38 ... PS-400.htm and I am sure that Speedway sells this too: http://www.speedwaymotors.com/1955-85-S ... ,3262.html and check out the price hard to go wrong there!
Last edited by Monza Harry on Sun Aug 14, 2016 5:45 pm, edited 1 time in total.
I'm not a hoarder I'm a preservationist 78 Monza Spyder (Soon To Be 2+2 with Spoilers)
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Re: 400sbc with th350 tranny

Postby spencerforhire » Wed Apr 13, 2016 5:19 pm

I bought one from Speedway 25+ years ago, but assumed (wrongly) that they would be available at Summit. Didn't even think to look elsewhere.
The "fleet"-
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
03 Silverado 2WD ex.cab (work truck/parts hauler)
04 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
93 Suburban- 350/4L60(retired)
00 Saturn SW2- wife's car
01 Saturn SC2- younger son's project
00 Saturn SL2- daughter's car
98 Saturn SW2- spare
and 3 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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Re: 400sbc with th350 tranny

Postby 75Monzta » Sun Aug 14, 2016 4:35 pm

Hey Spence, just make sure those Saturn fuse blocks are good. Replaced literally a couple hundred of them in my career as a tech. :-)
Eric Ruybalid
SR Performance
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Re: 400sbc with th350 tranny

Postby Monza Harry » Sun Aug 14, 2016 5:51 pm

So Spencer do you still have that "FLEET" of 13 cars? or is it time to update the signature? :pook: Harry P.S. I am down to 3 and 1/4 if you consider the black 1980 a quarter from almost 8, [the extra Monza was more complete before] house cleaning had to happen!
I'm not a hoarder I'm a preservationist 78 Monza Spyder (Soon To Be 2+2 with Spoilers)
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Re: 400sbc with th350 tranny

Postby chevyart » Sun Aug 14, 2016 7:11 pm

if someone else built the motor AND maybe they used an aftermarket crank, it could have been built with the crank internally balanced , therefore enaBLING YOU TO USE REGULAR AFTERMARKET HARMONIC BALANCER AND REGULAR 168 TOOTH FLEXPLATE. IF it is A stock GM CRANK, ITS MOst likely AN EXTERNALY BALANCED ENGINE, THEN YOU NEED TO USE THE PARTS LIKE SPENCE AND THE OTHER GUYS TALKED ABOUT. ART
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Re: 400sbc with th350 tranny

Postby spencerforhire » Sun Aug 14, 2016 8:59 pm

I hate to hijack this thread like this, but Monza Harry asked me to update my signature so I did. :shock:
At least they're not ALL in my yard. 5 of the Saturns reside elsewhere; My Daughter lives in ST. John's Newfoundland, both my sons live in the city, and 2 of the parts cars are lodged at a friend's place a mile down the road.
All the rest are used in a giant size game of Tetris every time I need to get a vehicle in or out of the garage. Or the hauler out for a weekend of racing.
The "fleet"-
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
03 Silverado 2WD ex.cab (work truck/parts hauler)
04 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
93 Suburban- 350/4L60(retired)
00 Saturn SW2- wife's car
01 Saturn SC2- younger son's project
00 Saturn SL2- daughter's car
98 Saturn SW2- spare
and 3 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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1972 Chevrolet Vega Hatchback


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