[CDW6212R]

What is the value of the 9 second SBF, how much is in that? Given that, a nice high budget for the engine and chassis, why not give plenty of love to the trans? I suggest a more modern trans, although I do have a rebuilt(not upgraded) C6 you could talk me out of.


I'd suggest thinking about a 6R80, the 1st gear is 4.17:1, and 6th gear is still 0.70:1, so plenty of strong gears. With no bands, it's stronger that almost all older stuff.

The hardest part is the cost, and the control system. It can be done without a $700+ adapter kit. The TC should cost about the same as a nice 4R70W unit or others. But the trans rebuild cost is a bit higher, you have to add at least the $600+ upgraded clutches, and a $600+ intermediate shaft. The 6R costs a good $300+ more just for the regular rebuild parts and solenoids. So the 6R can end up being easily $3500 plus the needed ring and pinion gear change and new driveshaft.

I'm plotting on a 6R swapped into my 98 Explorer, using a 2014 F150 PCM to run it and the SBF. I've just been browsing for drive by wire TB's, it will have to have that and the matching pedal, and some rewiring for the CC at the least. But the PCM control I have a plan that should work, for the cost of harnesses for the PCM, tuning, and work to the cross member etc. Without an adapter plate kit between the block and trans, it makes it a little shorter than other examples. You have to be willing to do without one bell housing bolt.

 

[CDW6212R]

Why not a built 4R70..? Can’t they handle around 500-550hp in stock form? I would think a 4R could be built to be reliable at 750whp. Then you get to keep an overdrive and don’t need an adapter to run it.
Nice hatch, btw.

The 4R is a nice strong trans, and can be upgraded a good amount now given the Sonnax hard parts. But when the 1/4 mile speed gets higher and higher, you might have to put in a higher R&P gear, to not run out of 3rd gear. You might have enough rpm to run through just 3rd gear in the 1/4 mile, but the 4th gear is useless except for cruising. That's why I'm moving to the 6R from the 4R, I think I may make use of the 5th gear by the end of the 1/4 mile.

 

[CDW6212R]

Before you badmouth the AOD you should look at a Freddie Brown AOD, like I said earlier, it's taking 1200rwhp like a champ with no hard parts breakage going on 5yrs and one refresh. It's been stupid reliable.

That's a huge accomplishment, and I'd love to see what internal parts were upgraded. A lot of the 4R70W and AODE parts swap into an AOD, but the AOD VB and OD are hard to upgrade much. I like that Sonnax is producing both a much stronger forward drum, and lastly their direct drum kit. Those are huge weak link upgrades, both for the 4R70W and AODE, plus the AOD if they do go into them also.

I think they do, I have the AODE direct drum kit to build a 4R for my 92 Lincoln. I want to do away with the AOD lock up and input qualities, plus the automatic varying shift rpm's. So a 4R70W or AODE should have more predictable shifting, and yes they take some electronics to do it.

They both use just two, simply two wires, for all shift commands. You literally could shift one yourself with a couple of toggle switches if you were crazy enough to do that. I wired in two relays and one switch into my 95 Crown Vic in about 2002, to disable 3rd and 4th gear when I wanted to just have two gears. They are simple electrically.

 

[CDW6212R]

^^^ lol

Thanks guys maybe I should just call silverfox and see what he recommends. I'd be cool with him sending me all the parts and assemble myself too... makes good content for the youtube channel.

I have a spare Sonnax direct drum kit if you go that route. It's the kit with the drum and intermediate shaft merged as the one special part, and the required sun gear that will go over that shaft, plus the new direct piston etc. It's a $650ish kit, I don't need this one since deciding to swap to the 6R.

76656-01K Smart-Tech Direct Clutch Drum and Shaft Kit 4R70E, 4R70W, 4R75E, 4R75W - PATC - TransmissionCenter.net

76656-01K Smart-Tech Direct Clutch Drum and Shaft Kit | 4R70E, 4R70W, 4R75E, 4R75W. The first upgrade to eliminate every critical weakness.

transmissioncenter.net

76656-01k

 

[CDW6212R]

Try this web page for combinations of trans and R&P gearing, tires, plus shift points/rpm. It's interesting and may help with choosing rear gears, or the transmission.

Gearing Calculator | RPM and Tire Diameter to km/h - mph with Shift Tracer

www.blocklayer.com