Tommy42088

Ok but what does it take to make a th400 work in my truck? I've never messed with those transmissions

Tommy42088

Might be a stupid question but I'm looking at transmission and do I need to buy one with a slip yoke or bolt on? I know I have to get my drive shaft modified so wasn't sure if it mattered

GMCGreg

Never swapped a th400 in place of a 4l60 in one of those trucks but I would guess
- converter
- longer driveshaft and yoke changed
- move or modify the crossmember for trans mounting
- shifting would have to be manual may or may not be able to make the stock shifter do this adequately
Not saying you should , just that it's an option

Tommy42088

so basically more work then the 4l80 just perhaps a little cheaper. Isnt the th400 a 3 speed?

The BallSS

iTrader: (9)

Some guys build 4L60 that last a while, most do not.
I'd just bite the bullet and do a 4L80 with performance clutches, HD drum and 34 element sprag.
That combo would last a really long time behind a turbo 5.3 and not cost an arm and a leg.
A built TH400 to hold 700whp will most likely require a manual valve body so down shifting won't be possible which on the street can kinda suck.

The BallSS

iTrader: (9)

It is so if the OD is important to you then stay with the 4L80 but the TH400 is a lot cheaper.
My car is more of a race car I drive on the street, so the overdrive wasn't worth the money to me because I don't intend on hitting the highway, but I can, and I have but its rare.
Physically they are almost identical and power capacity they are the same as they both use a lot of the same internal components.
My buddy is willing to sell, I told him to give me a price and he's looking at shipping.
Its brand new and never run so if you wanted him to send you some pics with the pan off or something, I'm sure he'd agree to do that.
I'd have bought it but I'm currently putting all my cash into my house to get it on the market to sell or else it'd be mine already lol.

Tommy42088

overdrive is definitely a must for me, my little one and the wife go joy riding with me sometimes so I definitely want to keep that possible. I'll go the 4l80 route then. I've seen alot with those parts in them but I wasn't to sure of what I needed to have done to it. Let me know when he tells you something then and I appreciate it.

Tommy42088

Something like this?

The BallSS

iTrader: (9)

Yeah, my dudes has an upgraded drum in his too and would probably be less than that with shipping but we'll see.
@Staleyp

Tommy42088

oh OK well let me know then, I havent purchased anything yet

misterwaterfallin

add me as a backup as interested party. I’m in north Idaho and looking for a mildly build 4l80

The BallSS

iTrader: (9)

My guy is in Billings, Montana iirc.

Tommy42088

You haven't found out anything from him yet on pricing?

The BallSS

iTrader: (9)

Not yet, he's looking into shipping through Fastenal.

misterwaterfallin

Thanks, that's a bit of a drive.

I just got a quote for a 4l80 from Portland to Spokane at $300 so shipping isn't cheap as it once was

The BallSS

iTrader: (9)

Nothing is as cheap as it once was unfortunately, you can thank the dipshit in the White House for that.

Staleyp

iTrader: (4)

Sorry all, I have been super busy and just now getting on the forum from my PC. IT wasn't playing nice on my phone.

Staleyp

iTrader: (4)

Hey shoot me a PM and we can exchange numbers as Texting will be faster for me to get info back and forth.

Paul

Tommy42088

Do i have to change my flex plate on when putting a 4l80 on my lm7? Circle d said it should give me a gm bolt up pattern choice when choosing my torque converter but I don't see that option

The BallSS

iTrader: (9)

You might if its not dual pattern.