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Gas\Diesel Engine & Transmission:

transmission ideas?



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Old 11-14-2008, 10:38 AM   #1
 
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transmission ideas?

what would be better for a street machine/emergency response vehicle/weekend mudder?

TH350 or 4L60 or 4L80? what about the thm700-r4?

basically I want four gears... so i can cruise on the highway with sucking a tank full of gas every 20 miles...
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Old 11-14-2008, 11:06 AM   #2
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Old 11-14-2008, 11:06 AM   #3
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The TH-350 is a three speed. But if wanted to spend the money I would go for the 4l80..
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Old 11-14-2008, 02:21 PM   #4
 
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this would be for a 78 blazer that will eventually have a chevy 350 and a NP205 or NP208...
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Old 11-14-2008, 03:11 PM   #5
 
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Originally Posted by weldingpwr View Post
The TH-350 is a three speed. But if wanted to spend the money I would go for the 4l80..
what about what you have? the sm465?? isn't that a 4 speed?
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Old 11-14-2008, 03:13 PM   #6
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The 465 is a granny four speed which means its last gear is a 1:1. But an auto 4 speed would have a .7:1 overdrive..
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Old 11-14-2008, 03:17 PM   #7
 
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ah... well then... i guess i will stick with trying to find a 4l80... or a 4l60... and a NP205...
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Old 11-14-2008, 03:18 PM   #8
 
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thank you everybody for your insight... since i'm new to the whole process any info is good info...
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Old 11-14-2008, 04:30 PM   #9
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ah... well then... i guess i will stick with trying to find a 4l80... or a 4l60... and a NP205...
gonna need a computer (tcm) to use those or a manual valve body.
If my mind suits me correct.
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Old 11-14-2008, 04:33 PM   #10
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700R4 has overdrive and some came with a NP208.
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Old 11-14-2008, 06:26 PM   #11
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700r4 would be the easiest and cheapest.
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Old 11-14-2008, 07:07 PM   #12
 
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so a 700r4 with a 205 or a 208? isn't one of those electronically controlled? My engine will be carburated so if a 700R4 would work... i might go looking...
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Old 11-14-2008, 07:57 PM   #13
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The 4L60E and the 4L80E are both computer controlled. They're pretty expensive to retrofit into an older rig. The 700R4 came with a 208 behind it for quite a few years, so that's a combination that is pretty easy to find complete from a donor vehicle. Be sure to also get the t-case shifter, the adapter between the trans and the t-case, and the crossmember. All are different than what your 78 K5 came with.

If you can find a '89-'91 1/2-ton Suburban or K5 it should have a 700R4 and a 241 t-case, which is more desirable than the 208. (Other GM trucks had IFS by then and the t-case output is on the wrong side for your rig).
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Old 11-15-2008, 06:59 AM   #14
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You will probably have to get a wiring kit for the lockup torque converter, summit sells one, or pull out the wiring from the vehicle you get the trans from. I think a vacuum controlled switch on the firewall controls the torque converter.
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Old 11-15-2008, 02:39 PM   #15
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Dont buy an th700r4 older than -87, before that the were weaker. The th700r4 has a bad reputation but maintained or rebuilt in the right way they can take a lot of beating.

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Old 11-15-2008, 05:33 PM   #16
 
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so for a 305 or 350 v8 in a 78 if i want a 4 speed then its pretty much a 700R-4? it'll be for a carbuerated engine... right now its a 305 but i'm planning on rebuilding a 350...
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