View Poll Results: Replacing the 4R70
Yes it's a good idea
1
11.11%
No it's a bad idea
3
33.33%
Modify the 4R70 first
5
55.56%
Voters: 9. You may not vote on this poll
4R70 replacement
Post Fiend
Joined: Apr 2006
Posts: 12,281
Likes: 1
From: Saskatoon Saskatchewan
Not trying to discourage you but may i ask why is the tranny you have blown or too weak? if there is nothing wrong i dont see why to swap it out unless it its toast or you really want to do it...
Thread Starter
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Elder User
Joined: Dec 2007
Posts: 842
Likes: 0
From: royal oak, mich
Not discouraged a bit. I'd like to rebuild a 4R100 and put it in at a later time. I don't do things on a whim. I just don't want to sink any money in a project that doesn't give me the return I want.
Posting Guru
Joined: May 2006
Posts: 2,486
Likes: 0
From: Iowa
apparently the computers are incompatable in the trucks, i have been told its not a software problem, its actually a hardware problem... so the computer would have to be swaped from a 5.4l that had the 4R100 in it.
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Elder User
Joined: Dec 2007
Posts: 842
Likes: 0
From: royal oak, mich
Thanx. I'm not surprised but did they everoffer a 4R100 in a 7700GVW F-150? I'll have to call my tuner and discuss any problems to. He said he could cover a 4v engine when I swap.
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Elder User
Joined: Dec 2007
Posts: 842
Likes: 0
From: royal oak, mich
I thought so. I should have got that option when I got the truck. I wouldn't be running around with these 3.55s either. I've heard the tuners are rough on the trans pump so I really want to get a shift kit.
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Posting Guru
Joined: May 2006
Posts: 2,486
Likes: 0
From: Iowa
shift kit dosnt help much with these kinds of trannys, the tuners are the best route to go... the shift kit was a big help on the turbo 350 and 400's but they dont make near the difference on these transmissions...
just some food for thought
just some food for thought
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Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
All that the tuner does is allows the solenoid valves to move faster, thus a faster/firmer shift without the useless wear when slipping between gears. I don't know how that would effect the pump. S shift kit will help with the tuner, but it just uses heavier springs and would have the same effect on the pump.