351 EFI w/ Explorer serp dress and 4R70W

[chuzie]

That would be great. Viper already provided numbers for the C4 plate so it would be good to compare to the 4R70W plate. Let's try for depth on converter and crank holes.

Thx.

Sent from my Droid using Tapatalk 2

 

[chuzie]

Found some on summit and advance auto for around $50 for an 87 Crown Vic w/5.8.

As soon as I get confirmation the variant of C4 flexplate we currently have will not work, I will order it.

FWIW- The advance site crossed the Crown Vic flexplate to match with a '77 Bronco. Not sure how valid or trustworthy that data is.

 

[Bronco73]

I still have the explorer motor and trans so I will get some numbers later today for ya.

 

[Bronco73]

From the block plate to the flywheel side facing away from engine is 1-1/16. From flywheel surface back in to the mounting surface of the converter is 5/16. From flywheel surface to inside the crank it appear the tip of the converter will be 1-1/4.

I took these measurements with the flywheel and block plate still on the engine. I used a framing square to keep things as close as possible when measuring.

I have a rough sketch of what I measured I can email you a picture of it.

 

[Broncobowsher]

Will an E4OD auto flywheel work? Just thinking outside the box.

No.

The offset (bellhousing face to convertor mounting depth) is different. You will bottom out the convertor and hurt the transmission and/or the thrust bearing in the engine.

Bad part is it will almost work. Correct balance (available), bolt pattern and tooth count. It can be forced into place without trying that hard. Be careful NOT to get one of these.

 

[nvrstuk]

Bbowsher is saying what I'm saying...the E40D almost fits BUT doesn't. I'm waiting for the moderator of where I posted my build thread to see if it's possible to archive my post so i can post up the numbers!

 

[chuzie]

Looking forward to that info. My intake adapter and balancer pulley arrived yesterday so everything is ready to go except for the flywheel.

Sent from my Droid using Tapatalk 2

 

[Tex1911]

I have been following this but I'm a little confused on the flex plate will 88 and newer 5.8/aod flex plate work if not will yall point me in the right direction thanks

 

[chuzie]

Yes.

We are attempting to determine the CORRECT amount of recess needed to prevent the TC from bottoming out before it is completely tightened. Once we have that number, we can compare it to the C4 flexplate we currently have and determine interchangeability.

NVRSTUK has these measurements but is having issues getting hold of them.

 

[Tex1911]

any update?

 

[mattt]

Found some on summit and advance auto for around $50 for an 87 Crown Vic w/5.8.

As soon as I get confirmation the variant of C4 flexplate we currently have will not work, I will order it.

FWIW- The advance site crossed the Crown Vic flexplate to match with a '77 Bronco. Not sure how valid or trustworthy that data is.

That cross reference is correct. I am running a 351 and AOD with the aforementioned flexplate. I see you referenced a post with a picture I posted in the past. I was able to figure this out during my build because I had both flexplates in hand and the differences became apparent once you had one up to the other.

The Crown Vic 5.8/AOD vehicle is a good reference point and you found that the part # is the same for the Bronco C4 flexplate. They are the same for the following reason......both are 28oz imbalance, 164t, ~11.5" centers for converter, and have the correct recess for the converter. The C6/E4OD both use the deeper offset that shoves the converter too far back into the trans and will wipe out the pump in the trans upon startup. Think of it this way.....small trans(C4, AOD, 4R**) is plate 1......large trans(C6, E4OD) is plate 2.

My 351 was out of a Lightning(which came with an E4OD), so the engine had that plate on it. I bought a Pioneer part # FRA-205 plate and my Bronco has been running fine for over a year. If I remember correctly, the large trans plate is Pioneer part # FRA-202 if you want to confirm.

 

[chuzie]

I have always run an aod flexplate, even with my c4 without issue. Gonna measure them tomorrow just to be sure.

Thanks.

Sent from my Droid using Tapatalk 2

 

[nvrstuk]

Been sitting at a hospital all week, will check with the site moderator tonight....

 

[chuzie]

I had the opportunity to measure an AOD 50oz and a C4 28oz flexplate while troubleshooting my notorious engine squeak.

My findings are posted below. In a nutshell, the two are, in fact, compatible.

I measured the distance of the crank holes as well as the torque converter holes with the flexplate
facing down on its aft face to try and obtain the most accurate readings. These numbers are averages.

C4
Crank: 0.839
TC: 0.380
Displacement: 0.458

AOD
Crank: 0.893
TC: 0.403
Displacement: 0.490


Next I flipped it over and attempted to meaure the torque converter holes. This was more difficult since

the flexplates liked to teeter slightly on the hub.

C4
0.543

AOD
0.543


More or less, these two flexplates are exactly the same, weight aside.

Mystery solved. Now I can continue and use the C4 28oz flexplate that came on the 351 with my 4R70W.

 

[Tex1911]

Thanks Chuzie now I feel more confident on my install.

 

[nvrstuk]

Great news!

Wish I could have accessed and helped out. Contacted moderators again and am waiting. They've got a life, I understand.

Will post if I find out anything different.

 

[mattt]

part # is part #.

There are many part #'s that work on multiple applications and many different vehicles. Why else would Vatozone carry a headlight switch for only a 69 Bronco?

 

[blazinchuck]

got a couple concerns...

we planned to run the 5.0 valve covers, however when installing the 351 lower intake...we notice it does not have the same pcv location like the 5.0. are we asking for trouble running 5.0 covers with out any vent/breather or pcv? should we change and use other valve covers?

also...the distributor we got from a 351 yesterday is not right. it looks like someone might have used a 5.0 oil pump and drive shaft and 5.0 distr...not the 5.8 distr. our oil pump shaft in our 5.8 is bigger. im sure i remember the cam gear should be steel if running a roller cam...but what should it be when running a non-roller cam? cast or bronze? thanks...we are trying to get this finished and installed asap.

 

[chuzie]

Thanks for posting up bro.

Looks like I have two options with the PCV.

1. Run a neutral pressure system with nothing but a breather and cap off the vac line for PCV and the breather line going to throttle body.

2. Modify the valve cover opposite the one with the breather going to the throttle body and place a PCV in it.

I am leaning towards going with option two so we don't have to worry about blowback issues caused by poor case pressure.

The distributor for non-roller 351 has a cast gear where the roller is steel. As we know, the oil pump drive is large in the 351 and I am baffled how in the world I pulled the 302 roller distributor out of a 351 at the parts yard yesterday. I can only assume that it was placed there by mistake. You know what they say about assuming!!

Waiting to see if a local buddy has a dizzy for me.

Thanks.

 

[rastiss]

why not just rebalance the 5.0 50oz wheel to the 28oz.? i had one done not long ago on another project for $50 bux.