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Old 04-20-2002, 02:51 PM   #1
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Post Can anyone ID this trani?

It is a turbo hydramatic, but that is all I know. The numbers are as follows:
80-03-23871
8632145 Lester-5
on the case is weld marked 93Cx
What is it, a turbo 350 or a turbo 400?
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Old 04-20-2002, 02:56 PM   #2
Longhorn Man
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What does the pan look like?


------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
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Old 04-20-2002, 03:32 PM   #3
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Good question. I will be right back.
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Old 04-20-2002, 03:37 PM   #4
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It look like it would be a THM350. Does the 80-03 mean that it was made in March of 1980
It also has an electrical plug on the side of it. What would that be for on a th350.
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Old 04-20-2002, 03:43 PM   #5
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The plug would be for a lock up torque converter, and with that said, '80 would be about right.
I know you can wire a toggle to it to activate the lock up, but I couldn't tell you how.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio


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Old 04-20-2002, 03:54 PM   #6
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I am still learning, so help me out a little. What is the function of a lockup torque converter. Does it act as an overdrive gear or what? Forgive the dumb question, but I know nothing about transmissions.
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Old 04-20-2002, 04:08 PM   #7
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At all speeds, you will have a little slipping in your transmision.
If you put 2 window fans facing each other, and put one on high, the other turned off, the one that is off will spin, but at a lower RPM. That is how your verter works.
When it goes into lock up, picture an arm reaching out from one fan, to the other, mechanicly locking them to one. The fan driven from the engine will be locked directly to the fan driving your tranny.
The RPMs will drop, but only by a couple hundred RPM. (from say 3200 to 3000)
The way they are done up from the factory, they verter will only go into lock up under certian criteria;
1. steady engine speed
2. 45 (ish) or faster
3. foot off the brakes
4. in top gear. (3rd on your tranny)


------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio




[This message has been edited by longhornmail (edited April 20, 2002).]
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Old 04-20-2002, 04:09 PM   #8
O'l Buck
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the lockup in the coverter acts as a clutch, giving a direct link between the engine and the transmission inside the torque converter. This allows for quicker acceleration, and engine braking. It will also reduce the temp of the transmission at highway speed due to the fact that the converter is not agitating the fluid so much.

------------------
Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s

Angel girl: 67 Cutlass convertible
330, 3spd stick

Greener: 90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE

no name yet: 72 442 under serious construction
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Old 04-20-2002, 04:20 PM   #9
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Would it be worth rebuilding to go with my new engine? I am building a 383 .40 over, 274 crane energizer cam double roller timing chain and gears, 72cc Dart ProI aluminium heads, which equals 10.2 to 1 compression. The cam is rated for a band starting a 2200 rpm thru 5500 rpm. With an edelbrock intake and a fresh Rochester 4bbl I will be pushing close to 475hp. I would rather have od but the engine is costing me more than I am allowed to spend at this point in project.
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Old 04-20-2002, 04:23 PM   #10
O'l Buck
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A th350 is a tough transmission, they take abuse well and peform nicely, on the other hand, the th400 is alot tougher, alomst bulletproff if not. But the 350 should do a nice job.

------------------
Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s

Angel girl: 67 Cutlass convertible
330, 3spd stick

Greener: 90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE

no name yet: 72 442 under serious construction
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option
00 Dodge 2500 4x4, 24V cummins, 5 speed

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Old 04-20-2002, 04:28 PM   #11
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Thanks for the info guys. I WANNA SEE THAT 442 Buck. 4bbl 4speed Dual(2)exhaust. A very cool car indeed.
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Old 04-20-2002, 04:36 PM   #12
Longhorn Man
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The 350 will be perfect for your truck. When you go to get it rebuilt, ask about teh lock up, and get a pro's advice on if, and how you can do it. Also tell him exactly what you are pushing (a heavy truck with a butt load of power) and how you'll be using it. He will build it acordingly.
As for an Overdrive tranny, stay away from them. With the power you are making, the tranny will cost more than your motor. (maybe not more, but more than you wanna pay)
Build up your TH350 (which eats less power than a TH400) and later on down the road, you can add a gear vendors over/under drive. These things are bullit proof. http://www.gearvendors.com/commercial.html

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio


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