Hi, I am putting all of my conversion plans together for my engine (350) /transmission swap. Would you recommend a 700r4 or th350? The biggest size tire that I will go is 35 X 16. I will still do a good bit of highway driving though. Will that be too much stress on the transmission. I have the 4.10 gears in the diff now, will eventually go 4.88. But for now, will those 35's be too much stress on transmission for highway driving?
700R4 or TH 350?
- Thread starter bryanjeep
- Start date
MudderChuck
New member
I´m not a big fan of the 700R4, it does have a low first gear and an overdrive fourth. But pretty much as regular as clockwork, I have to replace mine at 45,000 miles or so. The second time I replaced it; it was with a built and expensive HD model, that didn´t last any longer than the rest. Aux oil cooler didn´t help, niether did an oversized (deep) pan. Even put in a temp. gauge, so I could tell when the temp. got too high.
Have the original T350 (non lock up converter) in a 71 Chev one ton, second motor. Use the one ton as a tractor, 33X15.50´s, the T350 leaks some, but never a wimper.
The 4135 (I think, getting old and forgetful) is a better choice, than the 700R, they built it for a couple of years, then changed to the 4135E. The 4135 is hard to come by.
Have the original T350 (non lock up converter) in a 71 Chev one ton, second motor. Use the one ton as a tractor, 33X15.50´s, the T350 leaks some, but never a wimper.
The 4135 (I think, getting old and forgetful) is a better choice, than the 700R, they built it for a couple of years, then changed to the 4135E. The 4135 is hard to come by.
BakedAlaskan
New member
Agreed they were designed as a car transmission then made (or just tossed into trucks) I have had a couple and they are a pain in the a$$. Shift into fourth at 30mph drove me nuts. And yes you can fix it but it mainly is a bandaid job not really a cure. The TH350 is proven to be the choice.
Of course there is always a manual. N4500 or has someone found a way to mount Fords new 6 speed yet??
Of course there is always a manual. N4500 or has someone found a way to mount Fords new 6 speed yet??
BakedAlaskan
New member
That's the only one I can answer,......... yup!!!! But not enough to live with the the 700r4.
MudderChuck
New member
I´m with BakedAlaskan. Gas mileage is kind of a relative thing. You´ll get better gas mileage than a full sized pick-up, with the same tires. The 35´s will probably hurt your mileage more than the 3 speed. Not just turning the extra wieght, but pushing a lot more air.
, much more expensive rebuilding it than to have the slightly lower gas mileage from the bomb proof TH350 
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