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Old 03-19-2021, 06:46 AM   #1
gsharp
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Big Block Transmission

I'm running a BBC 454 with a TH400 transmission with the original rear end and 295/50R15 tires. It runs and drives great but it revs pretty high at 60 mph. I believe the factory gears are 3.73. I want to install an overdrive transmission but I've read that a 700R4 won't hold up to a slightly built 454. So I've looked into a 4L80E which would work great but then comes the issue of not having a controller. They want huge money for a stand alone or you can build some kind of homemade one. Anyone have any experience with this?

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Old 03-19-2021, 07:17 AM   #2
Clyde65
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Re: Big Block Transmission

Find a 4l80, not the electronic, that will live a lot longer behind your BB than the 700 will
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Old 03-19-2021, 06:06 PM   #3
jayoldschool
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Re: Big Block Transmission

All 4L80s are electronic. You can get a stand alone controller out of a van, some had separate PCM and trans controllers.
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Old 03-19-2021, 10:08 PM   #4
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Re: Big Block Transmission

I would suggest the 4L80E. Yes the controller and a TPS add up to some money. But you could get away with running a good used 4L80E versus spending $$$$$ having a 700R4 built to hopefully hold up behind a big block. The other issue with an electronic trans is the speedo is electric also. There is no speedo cable connection. There is info online on how to wire a factory ECM to operate an electronic trans as a standalone. That could be an option if you have more time than money
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Old 03-19-2021, 11:24 PM   #5
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Re: Big Block Transmission

Its pricy but there is the Gear Vendors route.
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Old 03-20-2021, 09:43 AM   #6
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Re: Big Block Transmission

Another alternative is to change the gearing in the rear and run taller tires. This will kill RPM but also probably reduce acceleration some. When I have looked at a 4L80, it was almost a wash with buying a Gearvendors.
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Old 03-20-2021, 03:31 PM   #7
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Quote:
Originally Posted by urmyboyblue View Post
Another alternative is to change the gearing in the rear and run taller tires. This will kill RPM but also probably reduce acceleration some. When I have looked at a 4L80, it was almost a wash with buying a Gearvendors.
That was why I mentioned it. Unless you stumble on a heck of a deal on the transmission and the electronics it can get quite expensive. Where the gear vendor unit is pricy you do have a brutally strong unit that can be moved to as many transmissions as you can destroy. lol
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Old 03-20-2021, 08:51 PM   #8
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Re: Big Block Transmission

You can run the ecm the 4l80e came with
Sloppy mechanic lays out how to do this

https://sites.google.com/site/sloppy...ans-controller
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Old 03-21-2021, 01:53 AM   #9
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Re: Big Block Transmission

Find Early Diesel Step Van And get Harness And Ecm works perfect
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Old 03-21-2021, 09:34 AM   #10
Clyde65
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Re: Big Block Transmission

A CableX box works to change speedo from electric to cable
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Old 03-22-2021, 02:27 PM   #11
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Re: Big Block Transmission

I run a US Shift TCM with my 4L80E. I think the Quick 2 unit and harness (TPS) are around $600.
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