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May 16, 2023 | 07:19 PM

#16

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,789

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From: Kentucky

How do you plan to retain the pinion preload after replacing the pinion seal?

May 16, 2023 | 08:30 PM

#17

Anonymous12

Thread Starter

Laughing Gas

Joined: Jan 2023

Posts: 1,172

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Quote:

Originally Posted by rla2005

How do you plan to retain the pinion preload after replacing the pinion seal?

I don’t know I thought it was pop the seal out and back in.

May 16, 2023 | 09:34 PM

#18

Hit Man X

Lead Driver

Joined: Sep 2002

Posts: 9,549

Likes: 2,034

From: North Texas

Neg on pinion seal, need to measure rotational torque.

You are 100% sure the AOD hits OD and has a lockup converter?

May 16, 2023 | 09:37 PM

#19

Anonymous12

Thread Starter

Laughing Gas

Joined: Jan 2023

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Likes: 114

I don’t know about the lock up converter. But I drove it in the first D it went 1500rpm on the overdrive. And I shifted it to the second D without overdrive and it was 2200 rpm sand both of these were going 45mph. How do I tell lockup converter?
I have to change the pinion seal anyways. So that’s getting done, it leaks.

May 17, 2023 | 12:56 AM

#20

My4Fordtrucks

Hotshot

Joined: Jun 2015

Posts: 12,871

Likes: 2,445

Quote:

Originally Posted by Anonymous12

So I have determined it is not a 3.55 with some help in another thread. It’s most likely a 4.10.

Quote:

Originally Posted by Anonymous12

I have to change the pinion seal anyways. So that’s getting done, it leaks.

When you take the cover off, look for the stamping on the ring gear to determine what gear ratio is actually in there.

I agree with the others about keeping the 4.10 ratio.

May 17, 2023 | 09:08 AM

#21

Sparky04SD

Laughing Gas

Joined: Oct 2003

Posts: 767

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From: Lynden, WA

My 95 F150 came with the OEM 3L55 8.8 axles. I had them changed to 4.10's and have never regretted it. I do run 10.50/33's on stock 7" aluminum rims and OEM springs. Had to trim 1/2" from front bumper though.

May 17, 2023 | 03:36 PM

#22

Anonymous12

Thread Starter

Laughing Gas

Joined: Jan 2023

Posts: 1,172

Likes: 114

Is this accurate? It seems like a well put together video. It’s on a Chevy instead of a ford so im not sure if it’s the same process.

May 17, 2023 | 04:22 PM

#23

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,789

Likes: 1,753

From: Kentucky

Same process. My only suggestion is do not remove the driveshaft from the transmission. Move it off to the side while keeping it connected to the transmission. Some wire to hold it up out of the way is a good idea.

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May 17, 2023 | 07:32 PM

#24

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

Likes: 1,499

From: Ottawa, Ontario

Quote:

Originally Posted by Hit Man X

You are 100% sure the AOD hits OD and has a lockup converter?

There is no separate converter lockup with the AOD it shifts 3 times up or down and that is it. This is because of the way the concentric input shafts are utilized.. the inner shaft drives 1st & 2nd through the converter while 3rd and 4th are direct drive via the converter body. This is also why there is such a big RPM drop going into 3rd.. not only does the gear ratio change but converter slip is lost at the same time.