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Old 08-12-2009, 08:56 PM
'83 Silverado
 
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700r4 to T-350 4wd

I have a 1983 4x4 long bed truck with the 700r4 and its burnt up. Im not worried about gas mileage since it will not be my daily driver. So im wondering what if anything I would have to change to install a th350 4wd transmission in place if the 700r4 4wd transmission. All info is appreciated, thanks.

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Old 08-12-2009, 09:26 PM
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List of parts. >> http://www.makcotransmissionparts.com/7-35A.html
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Old 08-12-2009, 09:26 PM
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saitek5678

Get the Th350 or you will have problems. Not about the bad 700r4 to begin with but with everything else. TH350 has a kickdown cable to the carb, 700r4 does not to begin. It will be a head ache.
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Old 08-12-2009, 09:37 PM
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saitek5678

Im, sorry ,you have the 700r4 and want a th350, this may work, if the th350 has a cable you will need to hook up with the carb linkage and adjust it right.
If not it will shift when you dont want it too and may not down shift much or at all. It could work. Do it right though otherwise it will fry from being in 3rd most the time over 30mph. Too much heat!
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Old 08-12-2009, 09:42 PM
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saitek5678

Is the th350 out of a 4X4? , if not ......forget it. I had to read your question again.
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Old 08-20-2009, 06:44 PM
'83 Silverado
 
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a little annoyed

my truck is a 1983 4wd with a 700r4. I was wanting to install a th350 from a 4wd truck. I have checked into the adapter kit that was posted by SSedan64 and I appreciate the info but im still unsure. I was told that the th350 wont mate up with the transfer case that was used with the 700r4, Im not sure what to do, A local parts recycler has a th350 with the transfer case and crossmember out of a '79 K-10 for $400. He also has a 700r4 out of a '85 for $600 that would be a direct fit, the problem is that the previous owner had a wiring clipping fit in my truck and I dont have a way to run the lockup in the 700r4 which is why I wanted to do the swap to the th350. Will a 700r4 operate without breaking down without the lockup working? All advice is appreciated, but do not try to make me feel stupid. Thanks.
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Old 08-20-2009, 09:20 PM
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I have a '75 GMC K25, and have looked at the swap going the other direction, from a TH350 to a 700R4. I think you might have gotten some misleading information on what it takes to make the swap. As far as I know, these are the issues:
- Total length of the two transmissions is different, which will affect driveshaft length you need.
- Spline count of the output for both transmissions is the same, so you do not need an adapter.
- TH350 has a kickdown cable and vacuum line, while the 700R4 has a TV cable and a lockup torque converter. TH350 kickdown cables are very easy to find.
- TH350 will not drive an electronic speedometer or Vehicle Speed Sensor - you have to find another way to measure vehicle speed, if you need electronic output (I think your '83 is a mechanical speedometer).

This article is about swapping to a TH350 for 2WD, but it provides a lot of good info.
http://www.oldengine.org/unfaq/leadfoot/th350in.htm

Bruce
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Old 08-20-2009, 09:38 PM
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ok,

a t-350 and 700r4 - 4L60 trans are different lengths in the main case sections.

The t-350 4x4 output shaft is shorter than the 700r4 - 4L60 4x4 output shaft.... there for the t-350 will not bolt up where a 700r4 was in a 4x4 application.

The t-350 and 700r4 - 4L60 are not directly swappable in a 4x4 application as many folks have noted for the length of cases are different, out put shafts are different lengths...

The 700r4 is a metric threaded case where the 4x4 adapter bolts on at the rear of the case.. A t-350 is NOT metric threads in those 4 bolt holes .

In a 4x4 application the speed-O is located on the T-case.

The cable to carb / EFI hook up between either trans is simple.

The vacuum hook up for the t-350 is simple.
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Old 08-22-2009, 07:31 PM
'83 Silverado
 
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thanks

I appreciate the info everyone, thanks.
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Old 08-23-2009, 12:07 AM
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I have a 87 suburban w 700r4I like you thought of changing to a 350 its not a good idea in less u have alot of extra money, u can get the 700r4 rebuilt by someone hue knows there trans and get a deep trans pan /extra 2 qts fluid in it and it will run good, I have 35's tires with 700r4 with deep pan and cooler it helps alot also make sure ur radiator is good and not leaking, keep the trans cool as much as possible helps alot
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Old 08-23-2009, 08:41 PM
'83 Silverado
 
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700r4

well, the reason i wanted to go with the th350 is because the previous owner hacked up the wiring and none of the switches are there to hook up the lockup the way it should be. so I dont know if i could ever get it to run right... I could buy a rebuilt 700r4 for $600 at a local junk yard, but i dont want to burn it up. Can you run the 700r4 without the lockup hooked up? Thanks for the info, Its very appreciated.
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Old 08-24-2009, 12:25 PM
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All the 700r4 needs is 12V to Pin-A on the plug to operate the lockup TCC/TorqueConverterClutch. If run in O/D without the TCC locked up it will overheat. Wire up a toggle switch or get the wiring/plug from junkyard.
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