TH350 Versus 700R4 parasitic loss

[Justin V]

Read on some website (that I am now unable to find) that the power needed to drive a 700R4 was nearly double that of a TH350, something like 65 hp loss through the 700 versus 35 hp loss through the 350.

It seems like a huge difference.

Wondering if anyone can confirm or deny or otherwise provide any real info on this...

 

[sweetk30]

i know they say th350 to th400 = around 20-25hp more to spin it all .

 

[Greg Ducato]

They are about the same, maybe slightly less on the 700R4 because of the lower weight clutch drums and components. I think you would have to fill the trans with cement to drag down 65HP with a 700R4.

 

[diesel4me]

I know quite a few guys who would like to fill their 700R4's with cement..and use them for boat anchors!..after they start losing reverse and overdrive...me included !..

 

[ktmoutfront]

I'm going to put a 700r4 in my Wildcat behind some kind of big block.

 

[6872xtc]

I can't say anything factual about the power loss, but I can tell you that I never noticed any decreased performance when I swapped one in place if a TH350 in my old C10. Only felt like an improvement!!
Now I like the lower 1st gear in the 700, but the splits are better in the 350..

 

[Bent77]

I'm going to put a 700r4 in my Wildcat behind some kind of big block.

Yeah? Show me

 

[ktmoutfront]

Have to find one first. Too much floor modifications for the 4l80e. And no controller.

 

[Bent77]

Scott has one

 

[ktmoutfront]

2wd needed. He can get decent money for the 4x4 version.

 

[Bent77]

Just add a t case. Don't be scared

 

[ktmoutfront]

Bagged Buick 4wd would be rediculous. Would look cool spinning all 4 tires on the boat ramp pulling the boat out of the water.

 

[Bent77]

Ill just call you Tv Tommy

 

[ktmoutfront]

Call me whatever you want. I don't know you and won't listen anyways.

 

[Bent77]

Likely

 

[vandelay industries]

It will take more energy to turn overdrive(as on a 700R4) + 4.11 rear gear than direct drive ( like a TH-350's top gear 1:1) + 2.56 rear gear

But this is kinda splitting hairs........

 

[ktmoutfront]

Towing with a th350 2.56:1 would suck.

 

[vandelay industries]

Towing with a th350 2.56:1 would suck.

Yes, i've tried it; Don't recommend it.

 

[mrk5]

Just add a t case. Don't be scared

Bagged Buick 4wd would be rediculous. Would look cool spinning all 4 tires on the boat ramp pulling the boat out of the water.

Think of it as an underdrive, not a tcase....

 

[skunked]

No 3rd pedal comments? I'm shocked.....