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?

Thanks

Thanks

Re: Big Block Transmission
 

Find a 4l80, not the electronic, that will live a lot longer behind your BB than the 700 will

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.

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

Re: Big Block Transmission
 

Its pricy but there is the Gear Vendors route.

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.

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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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

Re: Big Block Transmission
 

Find Early Diesel Step Van And get Harness And Ecm works perfect

Re: Big Block Transmission
 

A CableX box works to change speedo from electric to cable

Re: Big Block Transmission