I have a 2003 F150 FX4 4WD with a 5.4 and may have to replace the transmission (4R70W). My question is that I have a chance to get a low mileage 4R70W transmission that is from an F150 of the same year and engine size but is a 2WD. Will this transmission work without having to buy any "kit" or conversion? Thanks in advance.

 

No,,,It will not!
You need one from a 4X4.

 

What is the difference between the two?

 

The 2WD dose not have the 4X4 extension housing and extended shaft.
I have the parts to convert it,(I went from 4X4 to 2WD) Only problem is, The trans has to be totally disassembled in order to put the shaft in. The shaft is the last thing to come out when building a tranny and the first thing to go back in when reassembling it. ):

 

Will a 4R70W from a 4.6 work in a 5.4 if they are the same year?

 

Yes,if they are both 4X4. But you need to use the 5.4 torque converter.

 

Thanks for that info, Phil. I was planning on getting a new TC anyways. I'll just make sure it's one for a 5.4. I don't use it to pull anything. Just driving to and from work. Do you recommend a low or high stall TC?

 

I would just get a stock one....Not sure of the exact stall it is.

 

A higher stall rpm will liven up the standing start.
It will take higher rpm to begin pulling as well off idle.
With the higher rpm, the motor goes higher in it's torque curve before the converter hooks up so you feel it as better acceleration from a stop or low rpm.
It could have some affect on in town fuel mileage from the higher slip rpm before converter hookup.
On the road in OD, the lockup is on so stall speed has no effect.
If the stall speed is high enough, locking up the brakes at a stop and stalling the motor against the torque converter might spin the wheels when the brakes are let off.
Then your a hot rodder hi hi.
Good luck.

 

Just for the OPs reference.
I used to run a 2600 stall in my truck and it was very uncomfortable for street driving. ( I do race my truck)
I now run a 2400 stall and it has a lot better street drive-ability characteristics.

For a stock truck, I would go less then a 2400 stall

 

I just took my 2000 f150 5.4 triton and converted from 4 wheel to 2 wheel drive by splicing a driveshaft to make it longer( Not recommended) but in my situation it’s what I had to do…. Had one laying round the shop took measurement cut and welded it to length we took 2 pieces of pipe cut a strip out to fold it so that we could give the cut joint some extra back bone and kept the 4x4 tranny but found out quick within a mile that the *** end of the of that 4wheel tranny has fluid flowing all up in there and normally into the transfer case was wide open so I took a piece of 3/8 steel plate fabricated it to fit the tail housing on 4x4 tranny I took the seal out with out damaging it went to tractor supply and Lowe’s and got some 2 inch steel galvanized pipe welded it in center put the seal on bolted the plate to the transmission tailhousing installed driveshaft and took it down the road about a mile I was seein a bunch of smoke so I pulled over I think the smoke was from the night before because I only had a Small leak in the trsnny so I retightened it and it still has a slight leak but imma add a gasket later today and I’ll bet that does the truck