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Unread 06-08-2015, 01:46 PM   #1
AZdEvilYJ
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Yj Tbi 350 Swap to 700r4

So Im in the beginning stages of my 350 swap and have been trying to find an answer to my question with little to no luck.

Background:
My tbi 350 came from a 1994 Chevy c1500 backed by 4l60e.
The tranny I pulled is a 1988 700r4 with the 231c HD from and s10 Blazer.

Question:
What do I need to do to the trans or ECU to get them to work together correctly (ie shift, set idle, etc). Do I need to send the ecu for a tune or do I need any certain electronics from the donor s10 or c1500?

From what Ive read the ECU and TCM "talk" in the 1994 but what consequences will this leave with the 700r4??

I do not have the TCM from the 4l60e or wiring for the 700r4 as of now, but the junkyards are a plenty.


Thanks!

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Unread 06-08-2015, 05:06 PM   #2
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I may have found the answer to my own question, but advice and knowledge is still welcome.

Please correct me if i'm wrong, but if i'm understanding correctly, instead of the computer controlled shifts like the 4l60e, the 700r4 uses a throttle valve cable for shifting and a brake switch circuit relay to control the lock up for the converter.

The lack of TCM may only just throw a CE code unless I can get it tuned out. I'm still unsure if performance is affected.

Heres a link to the brake switch to control lockup
http://www.bowtieoverdrives.com/cata...php?ITEMID=332

and some FYI about the TV cable
http://www.tvmadeez.com/article/index.php
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Unread 06-08-2015, 06:44 PM   #3
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I know my 700r in my jeep with my 4.0 I just had to get the detent cable fitted correctly. I think your thinking of a 4l60 that's a ECU shift trans.

But this is going back ten years or more now so, ya........

Jason.
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Unread 06-08-2015, 08:34 PM   #4
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Quote:
Originally Posted by jason m
I know my 700r in my jeep with my 4.0 I just had to get the detent cable fitted correctly. I think your thinking of a 4l60 that's a ECU shift trans. But this is going back ten years or more now so, ya........ Jason.
TV cable aka detent or kickdown. Yea the 4l60e is comp controlled, but my motor had the 4l60e and I'm goin to use the 700 so I was curious if my motor would have any issues not using the 4l60e
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Unread 06-08-2015, 09:09 PM   #5
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The TV cable is not a kickdown cable and must be adjusted properly or you'll have serious problems. It has to be pulled by linkage on your carb. When you step on the gas pedal half way, the TV cable must be pulled half way. 1/4 push of the pedal pulls the cable 1/4 way, and so forth. That's how the tranny determines when to shift. Get that wrong and it will shift early, or late, slip or jamb in gear. Better off with a 4l60e
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Unread 06-08-2015, 09:15 PM   #6
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Quote:
Originally Posted by dahreno
The TV cable is not a kickdown cable and must be adjusted properly or you'll have serious problems. It has to be pulled by linkage on your carb. When you step on the gas pedal half way, the TV cable must be pulled half way. 1/4 push of the pedal pulls the cable 1/4 way, and so forth. That's how the tranny determines when to shift. Get that wrong and it will shift early, or late, slip or jamb in gear. Better off with a 4l60e
The 4l60e was 2wd and no good.

I understand the TV cable thing, and I also posted an informative link about the TV cable. I used detent and kickdown as alternative names since the name Tends to be interchanged on many forums although they are very different.

All that aside, my question still stands... What are the consequences of going to a 700r4 from the 4l60e as far as the computer controls are concerned.
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Unread 06-09-2015, 05:40 AM   #7
jason m
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I now understand your question regarding your motors computer. I'm pretty sure its not going to sense that the trans is different. Worst case if it does just send it out to be flashed and have that part eliminated from the computer.

Jason.
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And on the 8th day, God created the 14 bolt....
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Unread 06-09-2015, 02:05 PM   #8
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Quote:
Originally Posted by jason m View Post
I now understand your question regarding your motors computer. I'm pretty sure its not going to sense that the trans is different. Worst case if it does just send it out to be flashed and have that part eliminated from the computer.

Jason.
What it will sense is that the transmission is not there and corresponding sensors. I think that a flash would be in order.
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