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One of the wire harnesses to the tranny is different. Your 4R70W uses a 10 pin connector (#183) with three slots not used to control the shift solenoids. The 4R100 uses a 12 pin connector (#193) with three slots not used to control the solenoids.

Both use the following common circuits; 1138 Vehicle power, 359 Sensor return, 480 TTC control solenoid, 923 TFT, 925 EPC solenoid, 237 SSA, 315 SSB. The 4R100 also has the following two extra circuits that the 4R70W doesn't have. An extra 1138 Vehicle power and 924 Coast Clutch Solenoid. The 4R100 also uses a turbine shaft speed sensor and the 4R70W doesn't. As far as bolting up the 4R100 will bolt up.

JMC
 
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Even if you swap the harness your 4R70W is still missing three circuits. Your current PCM is using 4R70W inouts and you will be trying to control a 4R100 transmission. I imagine that it could be done but you would have to talk to a knowledgeable tuner to discuss how to reprogram the PCM.

JMC
 
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Sorry but I forgot a few more things that should be obvious. While the 4R100 will bolt up to the engine it is about 5 inches longer than the 4R70W so the drive shaft will have to be shortened. The tranny cross member might have to be moved back or even replaced. I would look at the flexplate and torque converters to be sure that they are for the 4R100. Your shift cable will be too short. Is your truck 4x4? id so the torsion bars will have to be replaced and the bracket moved back to the secondary location. And finally the exhaust crossover might be in the wrong location.

JMC
 
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no it's a 2wd supercrew...oculdnt i use a harley driveshaft?
It should work if the Harley has the 4R100 and is a SuperCrew. If it is coming from a salvage yard I would change the U-joints and have it rebalanced. There is no way of telling if it was dropped or not....

JMC
 

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The different rear ends may also be an issue due to their size....bolting up an HD driveshaft with the 4r100 to the smaller f150 rear end im sure will provide issues.

It is way more feasible to have your 4r70W rebuilt with new components to handle more abuse than it is to swap all this crap out. Look on the mustang boards here and search for 4r70w, many of them are putting a ton of HP through it.

Saint
 

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The pinion flange on the 9.75 and the 8.8 are the same on the 97 03 F-150s.

JMC
 

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my tranny is starting to slip in my 01 screw, and i was wondering if the 4r100 is a direct swap ?? because i know the lightning and HD trucks had them.
Did you ever get the answers you need?

I have helped a half dozen guys through it.
 

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Anybody done a 4r100 swap into a 04+ new body style truck???? getting one to bolt to the engine and the drive shaft should be no problem, but what about cross member, shift cables and wiring..??? Will it even fit the chassis?? Or does anyone know a of a good valve body kit that gives a fixed line or increased line pressure for the 4r75w...?
 

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Get yourself a shift plate kit, theyre inexpensive and will sharpen up your shifts without spilling your coffee.

Won't make your trans a 4R100 but it will appreciably lengthen the life of your 4R75W.
 

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I posted this question in another truck forum. I was told the mounting was different along with cross members and wouldn't go in my 4wd setup. Then there's the wiring. I just had a shift kit put in and changed the shift schedules.
 

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I've been running 4r70w's for over 14 years and have yet to understand why anyone would do this swap,what a waste...
 

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Im considering this swap to my 01' expedition 4wd. Anyone get it done??
I have helped a couple of customers swap a 4x4 truck, it certainly can be done. It requires a different Crossmember, Shifter Cable and Bracket, a suitable PCM, shorter/longer driveshafts and minor exhaust mods.

I've been running 4r70w's for over 14 years and have yet to understand why anyone would do this swap,what a waste...
Not to beat you up on this but you have a 3400 lb Apple and most of these guys have 45-5500 lb Oranges. I must also ask, what torque are you feeding through yours? Fully built ($$$) they hold up OK up to 600 ft/lbs then the trouble starts. Remember, the 4R75W is rated at a pretty wimpy 375 ft/lbs.
 

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My 94 f150 weighs a helluva lot more than 3400lbs....and so does my supercrew f150 with over 204,000 on the original 4r70w...
 

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My 94 f150 weighs a helluva lot more than 3400lbs....and so does my supercrew f150 with over 204,000 on the original 4r70w...
Ah, sorry, I thought you were referring to the cars in your sig. Still, what torque level are you at?

I'll grant that the 4R70-75W is a good transmission, matter of fact most stock class racers prefer it's predecessor the C-4 to the C-6 (4R100) as the C-4 will handle the power of a good 429 in a Cobra Jet Mustang and it is lighter and has less parasitic losses but it has it's limitations, that being a healthy Supercharged 5.4.
 

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One of the wire harnesses to the tranny is different. Your 4R70W uses a 10 pin connector (#183) with three slots not used to control the shift solenoids. The 4R100 uses a 12 pin connector (#193) with three slots not used to control the solenoids.

Both use the following common circuits; 1138 Vehicle power, 359 Sensor return, 480 TTC control solenoid, 923 TFT, 925 EPC solenoid, 237 SSA, 315 SSB. The 4R100 also has the following two extra circuits that the 4R70W doesn't have. An extra 1138 Vehicle power and 924 Coast Clutch Solenoid. The 4R100 also uses a turbine shaft speed sensor and the 4R70W doesn't. As far as bolting up the 4R100 will bolt up.

JMC
In need of help in a bad way. I have done my swap from 4R70 to a 4R100. All adaptations complete. My question is with the trans wiring harness plug. Is there an available diagram to show what pins are needed to operate shift solenoids on the 4R100 that the 4R70 did not. I have no motion and and crossing fingers it's not a problem with TV
 
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