View Full Version : 4r70 flywheel and torque converter


fordguy
09/12/11, 01:00 PM
what flywheel works with AOD (5.0 engine) and what size torque converter (bolt patter size not stall). need to start getting all that together for my swap.

Bronchole
09/12/11, 03:37 PM
You are looking for a flexplate, not a flywheel.

rjrobin2002
09/12/11, 03:51 PM
Is it a AOD or 4r70w? I just have a stock 1996 5.0 Explorer flexplate and torque converter for my 4r70w/5.0 combo.

fordguy
09/12/11, 06:43 PM
4r70w not an aod, and yes a flexplate not a flywheel

EricLar80
09/12/11, 07:13 PM
The AOD flexplate will work - 11.4in diameter bolt circle.

Eric

Broncobowsher
09/12/11, 07:33 PM
4r70w not an aod, and yes a flexplate not a flywheel

AOD uses the same flexplate as the 4R70W.

164 tooth
11-7/16 or 11.4" convertor bolt circle
50 oz-in imbalanc facotor if the engine is '82 or newer. 28 oz-in imbalance factor if the engine is '80 or prior (and all 351W)

Look for AOD/4R70W/C4. Not the C6/E4OD versions

fordguy
09/13/11, 06:03 AM
i am running an aod flexplate from my c4 because i have a late model engine. should be good to go then, right? just need a torque converter.

Broncobowsher
09/13/11, 07:14 AM
i am running an aod flexplate from my c4 because i have a late model engine. should be good to go then, right? just need a torque converter.

Sounds like you already have what you need. Good luk with the swap.

fordguy
09/13/11, 10:38 AM
Sounds like you already have what you need. Good luk with the swap.

sold my torque converter with my c4 so i have to purchase another torque converter. have the aod adapter and oil kit, aa states it will work for the 4r70w. the core the builder has is a v-6 that fits 5.0. i am going to take my engine plate and flexplate out to him and see what we have. i dont see a problem with using the v-6 one, yet.

Broncobowsher
09/13/11, 01:14 PM
The V6 transmission (4R70W) is fine. Especially if being rebuilt.
Not sure about a V6 torque convertor. Should work but not sure how matched it will be to a V8. I know of at least 3 different versions and the V8 explorer convertor was the best.
Do not use a V6 flexplate, it has the wrong balance for V8s.

fordguy
09/13/11, 02:01 PM
still have my aod flexplate. the actual choice for the t/converter is what is next. so you are saying the stock exploder works well.

fordguy
11/01/11, 07:31 AM
Ended up with a verified 29k mile a4r70 (2001) and torque converter. May just use the torque converter assuming it fits

chuzie
05/28/12, 01:47 PM
Is there any reason I can't run the flexplate I currently have behind engine for my 4R70W?

Currently running '89 5.0 w/ C4

Thx!

Viperwolf1
05/28/12, 02:37 PM
Is there any reason I can't run the flexplate I currently have behind engine for my 4R70W?

Currently running '89 5.0 w/ C4

Thx!

It's fine as long as it's got the 11 7/16" bolt pattern.

Broncobowsher
05/28/12, 02:41 PM
That should work.
Unless they had a 10" bolt circle rebalbnced for the HO motor. Always hard to tell how someone else did a conversion in the past.

chuzie
05/28/12, 03:06 PM
Thanks guys. I will give Transtar a call tomorrow and verify what converter I purchased when I rebuilt the C4 a few years back. That should clue me in on the bolt pattern.

Just don't want to wait till I have it taken apart to start looking for a flexplate. Not going to start till I have all the parts on hand.

kholding
05/28/12, 04:39 PM
Hmmmmm? I bought a 4R70W from a '98 F150 with the 4.2l V6. The trans is brand new (dealer surplus). Do I need to buy another torque converter? Total novice when it comes to this stuff. Thanks.

Broncobowsher
05/28/12, 05:26 PM
Hmmmmm? I bought a 4R70W from a '98 F150 with the 4.2l V6. The trans is brand new (dealer surplus). Do I need to buy another torque converter? Total novice when it comes to this stuff. Thanks.

I believe that convertor will be just fine.

chuzie
05/28/12, 05:33 PM
I'm confused. So why nay on the earlier converter and not this one. What is the difference? Please educate me bro.

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kholding
05/28/12, 06:43 PM
I do know when I read an article on the 4R70W they said the 4.2l V6 version (98 and later) was one of the better ones to get. The article said it could handle up to 450hp. I was hoping mine would be fine. The only thing I changed was the AA tail section.

chuzie
05/28/12, 07:00 PM
95 and later have the reinforced case.

Broncobowsher
05/28/12, 07:08 PM
I'm confused. So why nay on the earlier converter and not this one. What is the difference? Please educate me bro.

Sent from my Droid using Tapatalk

Sometimes I change the way I think.
Look up the part number for a V6 convertor and various V8 versions. See if any interchange. Somewhere I once had (pre computer crash) a great link that listed the differences in the convertors in regards to the K-factor.

Broncobowsher
05/28/12, 07:18 PM
OK, found some of the info I lost before
http://www.tccoa.com/articles/tranny/transmission/page2.shtml
Also found the 4.2 V6 is a 165 K-factor and the highest stall but the small lockup piston. Also read that it is a 135 K-factor.

chuzie
05/28/12, 07:23 PM
Ah, the 4R bible. That site has good info but is geared to the racing crowd. How can I interpret those K-factors to a Bronco and off road use? I would imagine I would want a lower K factor for off road application, right?

Broncobowsher
05/28/12, 08:35 PM
K-factor is basicly a way of measuring stall without the influence of the engine.
The 140 Explorer is a moderate stall, 2000+ in my case, but had good drive even below that.

Generally offroad does better with lower, but not so low that you are below the torque.