December 19, 2008Is your tranny still stock? If so,,that will be the next thing to go.
They say a valve-body will help prolong the life of the tranny. For the 4R70W I think it''s called a (separator plat).Plus you should get a tranny cooler from a V10 *or* a powerstroke.The cooler the better.
I was running a 2600 stall PI converter in my 4r70ws,,all 3 of them..lol
I went through 3 trannys in 3 years.Making just under 500rwhp back then.
When I got tiered of having them rebuilt I went with a 4R100 with a 2400 stall PI converter.( 2400 is what BTS recommended)
The only lockup converter I would recommend is the PI.