Transmission
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Transmission
I have a 2000 f150 xlt 5.4l 4x4. it has the 4r70w. is it supposed to have a 4r100? its been acting up when shifting from 2nd into 3rd. it revs higher than normal and then bumps into 3rd, i dropped the pan and changed filter and tranny fluid which seemed to fix the problem but after coming back from a snowmobile trip it has been acting up again. any thoughts on if its bad or should be changed again. if it has to be replaced can i just do a swap from a 70w to a r100 or is there computer programming stuff or anything for that matter i have to change. thanks
Post Fiend
Joined: Jan 2007
Posts: 18,157
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From: Stanton DE
Your truck has the 4r70w from the factory.
And it's a major big deal + very expensive to swap in the 4r100!
There's a lot of things you would need to change.
Just off the top of my head you would need,the 4r100,longer torsion bars,exhaust adjustment,dip stick and dipstick tube,shifter cable,4r100 trany wire harness,dash wire harness,4r100 computer,driveshaft adjustments(front and back). I think you would need new mounting brackets for the T case.
So you see,
it would be cheaper to just go with a built 4r70w.
And it's a major big deal + very expensive to swap in the 4r100!
There's a lot of things you would need to change.
Just off the top of my head you would need,the 4r100,longer torsion bars,exhaust adjustment,dip stick and dipstick tube,shifter cable,4r100 trany wire harness,dash wire harness,4r100 computer,driveshaft adjustments(front and back). I think you would need new mounting brackets for the T case.
So you see,
it would be cheaper to just go with a built 4r70w.
Mountain Pass
Joined: May 2009
Posts: 235
Likes: 0
From: Snow Camp, NC
Your truck has the 4r70w from the factory.
And it's a major big deal + very expensive to swap in the 4r100!
There's a lot of things you would need to change.
Just off the top of my head you would need,the 4r100,longer torsion bars,exhaust adjustment,dip stick and dipstick tube,shifter cable,4r100 trany wire harness,dash wire harness,4r100 computer,driveshaft adjustments(front and back). I think you would need new mounting brackets for the T case.
So you see,
it would be cheaper to just go with a built 4r70w.
And it's a major big deal + very expensive to swap in the 4r100!
There's a lot of things you would need to change.
Just off the top of my head you would need,the 4r100,longer torsion bars,exhaust adjustment,dip stick and dipstick tube,shifter cable,4r100 trany wire harness,dash wire harness,4r100 computer,driveshaft adjustments(front and back). I think you would need new mounting brackets for the T case.
So you see,
it would be cheaper to just go with a built 4r70w.
Post Fiend
Joined: Jan 2007
Posts: 18,157
Likes: 0
From: Stanton DE
I have talked to several friends that work on trannys and build them, and was told that there is no use to build the 4r70. Also as far as a dash wire harness and 4r100 computer I don't think you need them. A computer chip should cost less and will help out in alot other areas also. The thing is everything you would need to do the swap you can get off a wreaked truck. So this will cut the cost of parts in hafe. I would just go with a better stronger tranny in the 4r100 if I was going to stay with an slushbox (automatic).
Oh,so you or your friends have done the swap?
I did!
Tuned
Joined: Nov 2009
Posts: 392
Likes: 2
lmao. i have never done the swap, but from everything i have heard/ read (been researching 5.4 and possible tranny swap) but that most likely will never happen.lol any way, from what i have read, at a minimum you need a new computer because they are transmision specific, and you can only reprogram them for a different engine. and yea new wiring harness and all that good stuff.lol. personally i dont see a problem with using the 4r70w. it is a great tranny and we have beat the snot out of a few different ones without any issues.
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Post Fiend
Joined: Jan 2007
Posts: 18,157
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From: Stanton DE
lmao. i have never done the swap, but from everything i have heard/ read (been researching 5.4 and possible tranny swap) but that most likely will never happen.lol any way, from what i have read, at a minimum you need a new computer because they are transmision specific, and you can only reprogram them for a different engine. and yea new wiring harness and all that good stuff.lol. personally i dont see a problem with using the 4r70w. it is a great tranny and we have beat the snot out of a few different ones without any issues.
It's a must have item.When we started we thought we could program for the 4r100,,,but no go. Had to buy the 4r100 computer...lol
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Mountain Pass
Joined: May 2009
Posts: 235
Likes: 0
From: Snow Camp, NC
i never said they have done the swap. As far as computer that was me thinking that you could use a chip to take care of it. I'm happy for you on the the swap you have a better tranny than the 4r70. I need to do the swap or take an even better step and go with a manual. I know from experance that for my truck the 4r70 can't handle the power my truck makes. 
Tuned
Joined: Nov 2009
Posts: 392
Likes: 2
i never said they have done the swap. As far as computer that was me thinking that you could use a chip to take care of it. I'm happy for you on the the swap you have a better tranny than the 4r70. I need to do the swap or take an even better step and go with a manual. I know from experance that for my truck the 4r70 can't handle the power my truck makes.
Mountain Pass
Joined: May 2009
Posts: 235
Likes: 0
From: Snow Camp, NC
Nope sure exectly I have a 99 lightning motor ported and polished heads a custom cam, supercharger 10lb pully, custom exhoust. I know if I'm under 45 or 50 and I hit it the truck will speen 37s, and the tranny will start slippen bad. Yea I never been a fan of automatics. Everything thing else I have is a manual. I'm not sure on the quility of the 5 speeds in theses trucks. Personaly I would reather have a 6 speed for highway. The six speed is what I'm putting in my Saleen Mustang. To be percise the 6 speed is the T-56 magnum.
Tuned
Joined: Nov 2009
Posts: 392
Likes: 2
Nope sure exectly I have a 99 lightning motor ported and polished heads a custom cam, supercharger 10lb pully, custom exhoust. I know if I'm under 45 or 50 and I hit it the truck will speen 37s, and the tranny will start slippen bad. Yea I never been a fan of automatics. Everything thing else I have is a manual. I'm not sure on the quility of the 5 speeds in theses trucks. Personaly I would reather have a 6 speed for highway. The six speed is what I'm putting in my Saleen Mustang. To be percise the 6 speed is the T-56 magnum.
i was thinking you were planning on using one of the stock ford 5 speeds... i seem to have heard that they are about the sam as the 4r70w for towing... i cant remember for sure though.
Mountain Pass
Joined: May 2009
Posts: 235
Likes: 0
From: Snow Camp, NC
very nice. . . maybe one day.... =) lol i can dream about that kind of stuff right? lol i like the sound of that kind of power but i would have to keep my 4x4.
i was thinking you were planning on using one of the stock ford 5 speeds... i seem to have heard that they are about the sam as the 4r70w for towing... i cant remember for sure though.
i was thinking you were planning on using one of the stock ford 5 speeds... i seem to have heard that they are about the sam as the 4r70w for towing... i cant remember for sure though.
Post Fiend
Joined: Jan 2007
Posts: 18,157
Likes: 0
From: Stanton DE
i never said they have done the swap. As far as computer that was me thinking that you could use a chip to take care of it. I'm happy for you on the the swap you have a better tranny than the 4r70. I need to do the swap or take an even better step and go with a manual. I know from experance that for my truck the 4r70 can't handle the power my truck makes.
Now in your case it's total junk...lol You NEED a 4r100!
Your truck sounds bad azz!That is the reason I had to eventually go with the 4r100.
I tore 3, built for racing, 4r70s out of my truck in 3 years and it was getting very expensive! So I went with the 4r100
I'm making 594 rwhp/ 620 torque and hitting in with 100 shot of nitrous on top of that at the track. It was eating up the 4r70s
Post Fiend
Joined: Jan 2007
Posts: 18,157
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From: Stanton DE
Hes talking about putting in the bigger manual out of a super-duty.
