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Old 03-14-2009, 12:57 AM
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TH 350 trans/varifit bell/lockup?

Today I bought a TH 350 trans that has the universal bellhousing. How can I tell if it's a lockup trans? I don't think it is, and was told it came out of a van. Nice and clean, and had been sitting in a fellas garage for a while. It came with a new-in-the box TCI rebuild kit (no band however), a TCI shift kit, and drain for the pan. All for $75.00!!! No converter however. Also came with a new book, "Turbo Hydra-matic 350 handbook". Plans call for a street/strip, with emphasis on strip, trans. It will be behind a 333 CID 340 H.P. short block ( .040 over 327 ) with a flat tappet mechanical cam, 180 style high rise, and a 750 Holley. Olds/Pont rear with 4.88 gears, all in my 56 Sedan Delivery. What about a converter, what stall and diameter? Thanks.

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Old 03-14-2009, 01:50 AM
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Hi,
To tell if the trans is a th350c, look at the left side, if there is a plug there it's a lock-up converter type 350, good for cruising,
gives a little better gas mileage.
Rich
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Old 03-14-2009, 12:29 PM
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Thanks.

Very good, that's what I thought, and it does'nt have a plug. Input, and output, shafts turn "solidly", with some effort. I'm guessing it must be fairly low milage because of that, and it's so clean. It belonged to the brother of the guy selling it. I actually went to buy this trans and kit, as it was advertised on Craigslist for $75.00, and wound up buying a bunch of other new-in-the-box things. Then looking at the Summit catalog, I arrived at $898.50 for all the items; whick I paid a total of $135.00 for. Thanks again.
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Old 03-14-2009, 01:19 PM
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That's a nice score for that price. Don't worry about the lockup... some of the 350 lockups like to give fits and not unlock. Some guys actually seek out the pre-1983 350s just to avoid the lockup.
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Old 03-14-2009, 03:52 PM
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howdy there

the th350C was '81-86 FYI

ppl seem to have a hard time getting the year groups straight on gm transmissions

heres mine from a 1981 c-10 pickup with factory diesel oldsmobile 350 engine that i junked out years ago:

(buick division assembled) 10-bolt universal bellhousing found on all or most of the th350c models- note the extra length of input shaft only found on the lockup converter models. also note the large raised C cast on the pump:


note the black oval-shaped single-wire connector on the side for the lockup converter:


Last edited by fast68; 03-14-2009 at 05:19 PM.
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Old 03-14-2009, 04:30 PM
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plug

There is NO plug on this trans, and it has a solid input shaft, so it's NOT a lockup model, and it is a varifit bellhousing like fast68's pics. What years were the bells varifit? According to the book that came with this trans, the code "JL", on the trans, corrolates to a 1980 Chev 350 V-8 usage. Is that correct ( does'nt seem right to me)? Thanks.
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Old 03-14-2009, 05:12 PM
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yeah i saw that you said it had no side plug and such i was just posting the above to show ppl and learn them on this possibly

the first number on the code stamping pad(can see mine in the pic) should be the last digit of the year of the vehicle model year it was originally installed in

if its 1980 it may actually be an A however.

such as what GM did with the model year digit in the vin code of the 1980 model year GM trucks.

im not sure on that one otherwise.

and now that i think about it... i think 1980 was actually the first year of the C model 350 trans.

same year as the oil sticks moving to the other side of the sbc v8 engines, and the first year of the EST system on the chevy sbc v-8 engines, and also for the factory aluminum spreadbore intake manifolds.

Last edited by fast68; 03-14-2009 at 05:21 PM.
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Old 03-15-2009, 12:13 AM
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TH 350 trans ID

Oh, my trans does'nt have that pad (?). On the left hand side of the bellhousing are the only numbers/letters I've found, CFD 6261736 JL26D. The JL I took it to mean Chevrolet as per my book. Any idea what it might mean? I took the pan off today to see what it looked like inside, no crud in the pan at all. It's obviously been rebuilt at one time; silver paint, and silver paint overspray in places. Where can I get a "welded" band? I ordered a TH 400 style sprag assembly today. Why don't they still sell the 36 roller overun assembly WITH the race? All I could find was the race. Years ago, I bought the race AND roller overun from J.C. Whitney for cheap, now all they have is the race also. Been a while since I messed with a TH 350, it's been all Powerglides for years.
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Old 03-15-2009, 02:59 AM
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The VIN pad on most RWD transmissions is usually on the passenger side of bell fairly low, so you might check there on your 350.

According to my book the last year for the TH350 was 1979 in trucks and 1980 in cars. First year for the TH350C was 1980 in both.
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Old 03-15-2009, 02:38 PM
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TH 350 trans.

Thanks for everything so far. Anyone have a source for the "welded" band? It's the lone part I need. And, are any of the E-bay torque converters any good? Thanks again.
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Old 03-22-2009, 03:12 PM
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Quote:
Originally Posted by mmerlinn
According to my book the last year for the TH350 was 1979 in trucks and 1980 in cars. First year for the TH350C was 1980 in both.
This jibes w/what I have in my '80 Malibu wagon- TH350C/229 cid V6. Yeah, I know.

Last edited by cobalt327; 03-27-2009 at 09:18 AM.
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Old 03-26-2009, 01:46 PM
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The tech guys are ok and give a good parts list

400raptor.com had all the parts I needed to turn my 4x4 th350 into a powerful trans
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Old 03-26-2009, 10:33 PM
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TH 350 trans

Thanks for everything so far. I've given up on the "welded band", and bought a Kevlar lined one instead. Also bought the aftermarker 36 element drum/race assembly (they sure are proud of that!). Trans came with a TCI friction/steel/gasket kit, and a valve body modifier kit. Other than a few tricks, such as the extra bushings on the sun gear, is there anything else I should know? STOUT 327, 3400 lb., 4.88:1 gear, sedan delivery for street/STRIP.
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Old 03-26-2009, 10:48 PM
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Quote:
Originally Posted by junior stocker
Thanks for everything so far. I've given up on the "welded band", and bought a Kevlar lined one instead. Also bought the aftermarker 36 element drum/race assembly (they sure are proud of that!). Trans came with a TCI friction/steel/gasket kit, and a valve body modifier kit. Other than a few tricks, such as the extra bushings on the sun gear, is there anything else I should know? STOUT 327, 3400 lb., 4.88:1 gear, sedan delivery for street/STRIP.

many days ago I sent you a PM on where to buy the welded band strut t-350 band
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Old 03-27-2009, 01:44 AM
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welded band

Yes Crosley, I got the P.M., thanks. But, I did'nt get a very good "reception" on that end when I looked into it. Then, some other fellas I talked to said it was'nt "needed". So, out of frustration/confusion I went with the Kevlar. What is your opinion, any one better than the other? I've done a couple of TH 350's before, stock type rebuilds/converters, with a shift kit, and promptly shattered the race on one of them, the other's still plugging along in my truck. I usually build Glides for the brackets, but this car is going to see some street time also, and rather than be in it "all the time".........., I decided to go the TH 350 route. Is the "Case Saver" any better to use than the anti clunk spring? Any more tricks I can throw at this trans? I guess it does'nt need to be "dual fed", as the shift kit/separator plate takes care of that.
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