What 7.3 mods would you make with the trans out? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 09-06-2019, 10:26 PM   #1 (permalink)
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What 7.3 mods would you make with the trans out?

2002 F-350 7.3 4R100 2WD DRW
Totally stock. Totally. 120k miles. Developed a leak that we're pretty sure is the front pump seal on the transmission. If that's true, (gonna look closer/cleaner/better in the morning) the trans has to come out. While it's out, what else should be done? I know there's an upgraded front seal and I'll replace the bushing too, plus probably pull the pump and replace the seal behind it. Anything else?

This truck is literally a grandpa rig that moves a moderate sized 5th wheel trailer a couple times a year so not looking for billet input shafts or triple disc converters. I'm sure the up-pipes are leaking by now but don't think having the trans out will make that job much easier, if at all?

The truck has the optional OE transmission temperature guage and it's never been hot. I think age and low mileage caused the leak.

Thanks in advance for any info
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Old 09-06-2019, 10:46 PM   #2 (permalink)
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Check the flex plate good for cracks and do the up pipes
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Old 09-06-2019, 11:28 PM   #3 (permalink)
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If the trans temp guage on the 7.3 trucks is anything like the one on my 04 6.0 truck, it is pretty much useless. My trans got so hot before it died it was puking black fluid out the dipstick and the thing smelled like burnt atf and clutch(same smell as you would get with a stuck caliper) for a month afterward before I got to changing the trans. Temp guage still said it was perfect...
I suggest throwing in a rear main seal as well, might as well if you are in there.
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Old 09-07-2019, 06:36 AM   #4 (permalink)
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Rear main and uppipes.

Maybe do the pan if it's leaking. They're supposed to be a bitch though.

Add in an external cooler and a good temp gage.
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Old 09-07-2019, 07:32 AM   #5 (permalink)
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do the engine oil pan if it is rusty, they rust through pretty often up here
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Old 09-07-2019, 07:44 AM   #6 (permalink)
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Put a zf in it or spend the +-5k on the slushbox to make it last!
Rear mainseal ,new mounts if required.
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Old 09-07-2019, 09:33 AM   #7 (permalink)
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Does the trans being gone actually make the uppipes easier?
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Old 09-07-2019, 10:07 AM   #8 (permalink)
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Rear main is a good idea. Thanks

Last edited by mwilliamshs; 09-07-2019 at 10:08 AM.
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Old 09-07-2019, 10:39 AM   #9 (permalink)
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Quote:
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Does the trans being gone actually make the uppipes easier?
About a million times easier.
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Old 09-07-2019, 12:36 PM   #10 (permalink)
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Quote:
Originally Posted by mwilliamshs View Post
Does the trans being gone actually make the uppipes easier?
Yes.

Quote:
Originally Posted by bdkw1 View Post
About a million times easier.
This is how I did my bellowed up-pipes from Riff Raff a few years ago. They make such a nice product, I wouldn't even mess around with re-sealing the factory pipes.
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Old 09-07-2019, 03:46 PM   #11 (permalink)
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I would do a zf swap. And definitely a cummins swap
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Old 09-07-2019, 06:43 PM   #12 (permalink)
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Check the flex plate good for cracks and do the up pipes
This x2.
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Old 09-07-2019, 08:11 PM   #13 (permalink)
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Ceramic coated bellowed up pipes. One of the best things I've done to my 7.3
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Old 09-07-2019, 10:05 PM   #14 (permalink)
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Might not be a terrible idea to take a stab at the engine dipstick o-ring.
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Old 09-07-2019, 11:42 PM   #15 (permalink)
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Ceramic coated bellowed up pipes. One of the best things I've done to my 7.3
Absolutely. Even with the trans out, my arms still looked like I'd been milking weasels by the time I was done.
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Old 09-08-2019, 12:32 PM   #16 (permalink)
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Is it actually transmission fluid leaking? Fuel from the engine valley runs down the backside of the block and leaks out the inspection port weep hole and people thing its engine oil from rear main or trans fluid.

If it is trans fluid, Do any tow alot? Ive read a good quality torque converter, mechanical shift kit and bigger trans cooler fixes a good majority of the major weaknesses in the 4R100. I put the 6.0 cooler in my SD.
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Old 09-08-2019, 03:38 PM   #17 (permalink)
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T4 turbo swap, Hydra tuning, bigger transmission cooler.
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