A regular 350 don't have the electrical wire plug coming out of it, which is for a lockup converter. Can't remember exactly where it comes out of case at the moment.

Hopefully somebody can help me. I have searched this site and need some more help so I can get the right core the first time for my rebuild. I got my car which is a 1983 El Camino without a tranny in it. I'm going to try my hand at rebuilding my first tranny. But I need to find a core first. I am doing a 350 swap from a 305 without the computer. the tranny I need is a short tail. I am buying an aftermarket tranny crossmember from G-Force for the TH350 short tail.

1. How do you tell the difference between TH350 and TH350C? (pics would be great) Also what is the difference physically and mechanically?

2.Also is the lock up just in the converter or are they different cases and parts

3. Is there a site or book that i can reference part numbers so I can find the right core the first time

Anything Else I should look for please let me know. LOL I thought a 350 was a 350 no matter just differences in tailshaft. just wanting to get this right the first time and I appreciate all your guys help

thanks for reading this

 

That makes alot of sense. Thanks A regular th350 shouldnt have any electrical connections on it. Also from what im finding it looks like there are alot of trannys that are the same as far as how they are rebuilt, or atleast the books cover those trannys. might be easier just to run some numbers to find the right one
250
250c
350
350c
375b

Any suggestions on a good rebuild book? I seen one from Ron Sessions Maybe have to give that one a try

 

Hi,
you may want to check out tci below for a manual & video.
Take care,
Rich
http://www.tciauto.com/Products/Specialty/reference.asp

 

Another way to tell the difference between a 350 and a 350C (lockup), is to look at the input shaft. The 350C will have snout with O-ring and a fluid passage drilled down the center for the clutch. The 350 shaft will be solid with a blunt end (no snout/fluid passage).

 

Another way to tell the difference between a 350 and a 350C (lockup), is to look at the input shaft. The 350C will have snout with O-ring and a fluid passage drilled down the center for the clutch. The 350 shaft will be solid with a blunt end (no snout/fluid passage).

You need to look at a regular non-lockup input shaft of the t-350 again..... there is a hole in the shaft for fluid travel through the torque converter




A t-250C trans is ID withthe electrical connector on the driver's side near the shift linkage... on the passenger side near the cooler line fittings is a threaded stud with nut that protrudes from the case.... this is a band adjustment

 

You need to look at a regular non-lockup input shaft of the t-350 again..... there is a hole in the shaft for fluid travel through the torque converter

DOH! I hope my half asleep reply didn't make the guy pass up one he coulda' used..... :drunk:

 

Thanks guys for the reply

BstMech I didn't pass on any trannys due to your reply, The weather here has made me pass on a couple trannys. We just got like 4" of Ice/snow 2 days ago and im not really wanting to drive in this crap!!! BTW Is spring ever coming???????? Cant wait to get back to the garage!

Thanks richard, I have looked into their book and video, still unsure what book to get. hoping someone with some exp. could recommend a book for my first rebuild

So basically i'm looking for a 69-81 TH350 without any eletrical connections which would mean non-lockup, also one without band adjustment near the cooler lines on pass side which would mean it's a 250c

crosley what does ID mean?

thanks for reading this

 

A regular 350 don't have the electrical wire plug coming out of it, which is for a lockup converter. Can't remember exactly where it comes out of case at the moment.

This is not entirely true. Many TH350s from the 70s have a pressure switch with a single wire coming out of it for the Transmission Controlled Spark. The lockup TH350s have a four wire connector.

 

What does the transmission controlled spark do? Do i want this for a high performance build? ok I don't know what to think now?

 

This is not entirely true. Many TH350s from the 70s have a pressure switch with a single wire coming out of it for the Transmission Controlled Spark. The lockup TH350s have a four wire connector.

Actually a two hole and four hole connector was used.... on the t-350C trans.

These connectors were located near the shift linkage area of the case on the drivers side of the trans

 

Hi Elky,

Transmission controlled spark doesn't allow any vacuum advance in first gear, & a vacuum delay after the up-shift, after it's warmed up it, full vacuum while cold, it was a new emission thing in
72 or 3.
Take care,
Rich

 

Hi Elky,

Transmission controlled spark doesn't allow any vacuum advance in first gear, & a vacuum delay after the up-shift, after it's warmed up it, full vacuum while cold, it was a new emission thing in
72 or 3.
Take care,
Rich

I'll be...learn sumpin' new every day.

 

Crosley,

Could you shed some light on what i'm looking for? thanks

 

Crosley,

Could you shed some light on what i'm looking for? thanks

I do not know what you want.

A t-350 has no electrical connection plug near the shifter linkage....

a t-350C and t-250C has an electrical connector near the shift linkage. ALL t-250C trans were lock up converter trans

that is all you need to know.

The pressure switch for spark control was on the passenger side threaded into a pressure port near the bell housing area.... you remove the switch and install a thread plug.

 

Ha, I'm keeping you guessing. Not really, I just realized that I didn't post what type of tranny I was specifically looking for. Sorry about that. Im looking for a TH350 without lock up. If I find one with the pressure switch and I disconnect and plug, is it going to affect the tranny and how it performs? This is going to be a performace tranny with a TCI Ultimate Master racing overhaul kit and a TCI 11" breakaway 2200-2400 stall converter. Are the HD red clutches from TCI worth the extra 85$? Running a 400 hp 358CI sbc. I figure for around 500$ to 600$ for a pretty stout tranny is well worth the work. Plus I have a friend that rebuilds trannys for a living and can borrow the proper tools from.

Thanks for all the help guys :thumbup:

 

Too bad your so far away I've got a couple in the storage shed that are just what your looking for. The book by Ron Sessions is excellent, it is the one I used plus a little info off of this site and a few others when I rebuilt mine.

I'm in Macomb Illinois (3hrs) if your up for a road trip you can have one of them. You should be able to find a core locally though.

 

Hey thanks 6426yy, I definately appreciate the offer. I have found a core from one of the local transmission shops. They guaranteed that all the hard parts will be useable, if not I bring it back and they will give me another. It's hard to get guarantees on anything these days and at 75$ I couldn't go wrong. Thanks for everyone's help. As soon as the weather warms up i'll get out there and begin the tear-down. Thanks again and sorry for the confusion :thumbup: