Yes I used the original radiator, I had read that the 4by4 guys have no heating problems with it, infact some say it has more capacity than the 3.4 rad. Anyways the rad from my donor T-100 is too wide. I have done about 1000 miles
since transplant and temp guage stayed same as before. I do not run transmisson cooler lines through rad, didnt before either, I was using factory air to air cooler plus a smaller after market one, but during the swap I replaced them
with at 18000gvw aftermarket one. You see I have installed electric fan, just did that other day, however you can use the 3.0 rad, shroud and clutch fan and all fits as before.
Just for interests sake my customer with the most km on a 3.4 was in today. Its a 96 tacoma and has 653000 km, not even a valve cover has been off, I know as we sold it to him new and I have done all work on it, only timing belts etc.
we have 4 or 5 others who are past the 500000 and none have had anything other than normal maitenance so these are really good engines, trd also has a supercharger for them, now wouldnt that be nice!! I installed a supercharger
on a 2008 tundra 5.7 a couple of weeks ago. What a blast to drive, over 500 hp, think 13 sec quarter mile at about 105mph for a 5600 pound double cab. I would be in trouble all the time!
Jim