'95 4700LPX T444E

[BlackStack]

My '95 4700LPX T444E is currently set to 175 HP from the factory. It drives a 4 speed Allison auto tranny. The engine turns 2,300RPM at 55 MPH and bounces off the 2,700RPM rev limiter to go about 63-68MPH depending upon if I'm pulling a load or not. It is an old ChemLawn truck that I have a 12 foot dump on and pull a tri-axle trailer with. I like the truck and it's a work horse but it's just too damn gutless for pulling a trailer or hauling any weight up any grade.

What can I do to this thing to get more power? How big are the injectors? Are they going to be the limiting factor? Can I just add propane injection to get another 100-150 HP to climb the hills when towing a trailer? I wish I had a two speed rear end in this thing. Is turning 2,700 RPM hurting the engine at all? Can I turn it faster to go 75MPH empty or should I look into changing gears or putting a 2 speed rear end in it? Will the tranny hold up if I let it run through the gears before I put the coals to it? It's in 4th gear by 35 MPH anyways. It accelerates to 35-40MPH pretty good already it's just getting to 60 MPH or climbing a slight grade that is painfull.

What can you guys tell me here?

Thanks in advance,

Mark

[carnival owner mikey]

1) intake exhaust and a programmer/tuner will wake this truck up.cost? less than a grand
2) you can add propane but its by far not the most effecient route as far as cost/labor/safety
3)gear vendors prolly has something you can use but it sounds like your just geared low. the mods ive listed will get you to top speed faster but will not help (unless your speed limited electronically in wich case most tuners programmers will let you raise the speed limiter.
hope this helps

[Dieselfever78]

Talk to Bill at Power Hungry about programming, he can do them. As far as anything else they're just a PSD, which in the ford trucks turn out to 3200-3300.

But if you want a higher top speed I'd look into a re-gear. I'm not sure on the trans really

-Michael

[4fingers]

the transmission is the weak point on that truck. Im 99% certain that it has an AT545 wish is a worthless pos transmission IMO. Its non lockup type trans so the more power you add the more it slips and then your out a trans. we used to have a 95 4400 with the t444e and had the same problems. we ended up ditching it for a ford pickup