Im just wondering how the 727 3 speed with high mileage will hold up if i turn up my pump and do a 3200 spring, plus any helpful input.

 

i wouldnt think it would hold up very good.my old auto didnt hold up to stock.

 

hummmm... well... crud, i guess ill try anyhow, thats how ill find out!

 

My truck stock non i/c turbo, pump turned up and 3200 gov spring held up alright.But when i intercooled it and went to a hx35 it started to slip pertty bad. This is with 35in tires.

 

thanks for your input guys keep it cummin

 

I have some of the "free ip upgrades", plus the 3200 spring. My auto (with 104k) tends to go in and out of overdrive sometimes. When the weather warms up a bit I'll adjust or replace the tps.

I do have some slip, mostly when towing, (often as much as 10k), I attribute it to a weak torque converter. That'll most likely be my next investment.

Sometimes when towing, I manually work through the gears, instead of relying on the auto - much better at pullin the hills, esp. from a dead stop.

I suppose I could beat it to death in short order. But driving somewhat conservatively (I know - less fun), it has always brought me back home.

 

So the stock automatic transmission/torque converter can only handle the stock power level of 160 HP and 400 FT LBS the intercooled Cummins puts out? Can it handle a tad bit more, say 200 HP and 500 FT LBS? What about a stock transmission setup with the factory under the bed transmission cooler? I have the factory under the bed cooler mounted on the driver's side front of the flatbed, but it isn't connected to the transmission now (capped off). It seems like us auto transmission guys have to at least have a second cooler and a upgraded torque converter to at least support marginal gains when increasing power. I'm planning on achieving 250-275 HP and 600-700 FT LBS, but am worried I'll have to pull the low mileage automatic trans to make it durable enough to handle that power. I'd rather not bump the power levels up to the above numbers first and then have the transmission blow with less than 110-120,000 miles on it. What would one recommend to do to the transmission (not necessarily rebuilding it) to upgrade it to comfortably handle the increased power of the engine? Thanks for any advice.

Salvy

 

I'd go for a good diesel oriented valve body and torque convertor, preferrably from the same shop. Talk to people, make phone calls, and see what floats your boat.

I think the biggest weak link of the autos is the torque convertor, and that is why I wont own another without upgrading it immeidately. I had a 92 dually that got 22-23mpg empty, and decent towing MPG, but the performance absolutely stunk on ice. I sold it rather than put (then) $2500 in it to handle the loads. Some are better than others, and I think a lot depends on your point of view. One person's loose convertor may be ok or even tight to another person.

I'd get the tranny to hold what I want in the end, then start tuning the engine.

Daniel

 

With an AFC that is MIA and alot of tuning and big fuel mine didn't last an hour. LOL

 

mines fine i got the pump turned up and a 3200 spring and shes great.