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Thread: 4r70w and 4r75w differences
04-18-2010, 10:23 AM #1
4r70w and 4r75w differences
I searched on here a bit but didnt find a thread. Does anyone know the differences between a 4r70w and 4r75w? I have read from a few other places some of the differences but I wanted to start a thread on modularfords so I myself and others could ask questions.
04-18-2010, 10:29 AM #2
4r75 comes form the factory with hardended internal parts.,
1. Stub Shaft
2. Better Sun Gear
3. Some other upgraded parts
Think of a 4R75 was a "factory" built 4R70. The 4r75 can handle more power and is put in the Mach 1, Mauraders, and I believe the Lighting
I took a damaged case 4R75 and put the better parts in my 4R70 case plus extra clutches and so far it's been a great Transmission!
04-18-2010, 10:45 AM #3
A few differences I have found are the 4r75w has the following revisions: revised planitary ring gear, revised front pump assembly, wave plate used in the intermediate clutch, and maybe a few different accumulator springs. I have also read because of the revised planitary gear set and its oss sensor it can only be used with a computer for a 4r75w. 4r70w only works with 4r70w computer and 4r75w only works with 4r75w computer.
Ive read a wave plate softens the shift on the clutches.
Can you replace the wave plate with a solid steel to firm it up and therfore have less slip?
Can you rebuild a 4r75w with clutch parts from a 4r70w kit ?
Are all clutches, steels, and bands the same size or thickness?
Is what I have read so far true about the differences?
For anyone else like me who was woundering the oss speed sensor is the output shaft speed sensor. OSS for short.
Is the oss sensor what runs the speedometer in the newer cars thats why there are no splines or speed sensor in the tail shaft? And speed is run by sensor in the tail shaft of older transmissions?
04-18-2010, 10:49 AM #4
Lightnin Im pretty sure has a 4r100 but I could be wrong.
04-19-2010, 09:34 AM #5
04-19-2010, 03:39 PM #6
Also the way you tell the difference between the 4R70W and the 75 by looking at them , the 75 has an extra sensor right above the shift linkage , the 75 has an OSS sensor and a VSS sensor !
04-19-2010, 10:13 PM #7
Last edited by DOHC Holliday; 04-19-2010 at 10:16 PM.
04-23-2010, 10:05 PM #8
Thanks guys. I had ordered a complete clutch rebuild kit and it has on the package fits aod/4r70/4r75w. Just have to check clearances i guess.
08-20-2010, 10:52 PM #9
Lightning has the 4r100 from the Super Duty Series Pickup trucks.
If building a 4r7Xw auto, it really does not matter with witch you start.
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