Turbo 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

swamp rat · 08-20-2010, 01:34 AM

Ok I hate to ask this but are there differences in the turbo 350 casings, i read somwhere that in the early to mid 80's there was som echanges to them making them less desirable. If so how do i ID my tranny?

cableguy0 · 08-20-2010, 01:47 AM

There was a th350 and a th350c. The th350c is a lockup transmission at quickly identified by the electrical plug on the driver side. Other than that a th350 is a th350.

swamp rat · 08-20-2010, 02:13 AM

Ok thanks, honistly i cant remember if i read that or if someone told me that. I also recalled that someone told me there was a heavy duty truck (possibly 4X4) transmission as opposed to a car version, guess thats not true also..

cableguy0 · 08-20-2010, 10:53 AM

There are differences in the amount of clutches used in certain transmissions. for example a 6 cylinder transmission has less clutches in it than a v8 transmission but 99% of the time when the transmission is rebuilt the clutches will be added by the rebuilder so its pretty much a non issue.

60ratrod · 08-20-2010, 11:48 AM

usually the biggest differences you find betweed th350's (the 2wd ones that is) is the tail housing length. there's a 6" tail housing and a 9" tail housing. and the tail housings really only matter when you are swapping transmissions and needing the right length of drive shaft for the tranny. i think that the 9" version is the same length as the th400 and the 700r4 trannies if i remember correctly

swamp rat · 08-20-2010, 12:37 PM

Quote:

Originally Posted by cableguy0

There are differences in the amount of clutches used in certain transmissions. for example a 6 cylinder transmission has less clutches in it than a v8 transmission but 99% of the time when the transmission is rebuilt the clutches will be added by the rebuilder so its pretty much a non issue.

Thanks for the info! didn't know know it was possible to add or remove clutchs, i'm assuming you might be refering to the amount of clutch disks and seperator plates within each clutch pack?

swamp rat · 08-20-2010, 12:39 PM

Quote:

Originally Posted by 60ratrod

usually the biggest differences you find betweed th350's (the 2wd ones that is) is the tail housing length. there's a 6" tail housing and a 9" tail housing. and the tail housings really only matter when you are swapping transmissions and needing the right length of drive shaft for the tranny. i think that the 9" version is the same length as the th400 and the 700r4 trannies if i remember correctly

Yep, i knew there was different tail housing lengths, wouldn't have a clue on the applications tho.

cdowns · 08-20-2010, 12:55 PM

theres also the BOP that the bellhousing is different than chevy

swamp rat · 08-20-2010, 07:48 PM

Quote:

Originally Posted by cdowns

theres also the BOP that the bellhousing is different than chevy

BOP???? Ya got me on thatone

68GMCCustom · 08-20-2010, 07:58 PM

Buick, Olds Pontiac

benoit454 · 08-20-2010, 08:18 PM

yea some had the B,O,P, that would bolt to a chevy, buick, pontiac, or olds and some were bop only. as well as most chevy only. The lockups started around 79-81 or so and went to I think 86-88 or so, long tails were mostly trucks from the 70's and 80's from what I've seen and some cars I guess could, but there is also a 12 inch tail, never seen one of them though but they are out there. I got a 9 inch tail in the yard that came out of dad's 84 but was non lockup, and he's got a short tail in it now.

08-20-2010, 01:34 AM	#1
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Turbo 350 Ok I hate to ask this but are there differences in the turbo 350 casings, i read somwhere that in the early to mid 80's there was som echanges to them making them less desirable. If so how do i ID my tranny?

08-20-2010, 01:47 AM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Turbo 350 There was a th350 and a th350c. The th350c is a lockup transmission at quickly identified by the electrical plug on the driver side. Other than that a th350 is a th350. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

08-20-2010, 02:13 AM	#3
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: Turbo 350 Ok thanks, honistly i cant remember if i read that or if someone told me that. I also recalled that someone told me there was a heavy duty truck (possibly 4X4) transmission as opposed to a car version, guess thats not true also..

08-20-2010, 10:53 AM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Turbo 350 There are differences in the amount of clutches used in certain transmissions. for example a 6 cylinder transmission has less clutches in it than a v8 transmission but 99% of the time when the transmission is rebuilt the clutches will be added by the rebuilder so its pretty much a non issue. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

08-20-2010, 11:48 AM	#5
60ratrod yes, i do Join Date: Jun 2007 Location: Spokane, wa Posts: 2,734	Re: Turbo 350 usually the biggest differences you find betweed th350's (the 2wd ones that is) is the tail housing length. there's a 6" tail housing and a 9" tail housing. and the tail housings really only matter when you are swapping transmissions and needing the right length of drive shaft for the tranny. i think that the 9" version is the same length as the th400 and the 700r4 trannies if i remember correctly __________________ ERROR 404....... SNAPPY COMEBACK NOT FOUND _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900

08-20-2010, 12:55 PM	#8
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Turbo 350 theres also the BOP that the bellhousing is different than chevy __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-20-2010, 07:58 PM	#10
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Turbo 350 Buick, Olds Pontiac __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

08-20-2010, 08:18 PM	#11
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: Turbo 350 yea some had the B,O,P, that would bolt to a chevy, buick, pontiac, or olds and some were bop only. as well as most chevy only. The lockups started around 79-81 or so and went to I think 86-88 or so, long tails were mostly trucks from the 70's and 80's from what I've seen and some cars I guess could, but there is also a 12 inch tail, never seen one of them though but they are out there. I got a 9 inch tail in the yard that came out of dad's 84 but was non lockup, and he's got a short tail in it now. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454



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