quality? THM350 or 700R4 transmission

[tripod12133]

I have a transmission in my monte carlo that i took the engine out of and the transmission model is THM350. But ive heard about a 700R4 transmission also. and i cannot remember which one is better. can someone answer this for me ?

all the best
marcus R.

[NoRiceHere01]

700r4 is a four speed auto, 4th being overdrive. the th350 is the basic 3 speed auto. its not a question of which is tougher, its up to u whether u want an OD tranny or just the basic 3 spd. either is plenty tuff enuf unless ur really makin big hp and torque, especially the th350

[lambohawaii]

Thanks didnt think the 700r4 would hold up

[89IROC&RS]

either one can be built for power, my 700-R4 can handle 600hp, but a stock unit has a signifigantly lower power handling ability. for a daily driver street strip unit, i would go with the 700-R4, if your building a drag car, i would go with the TH350.

[tripod12133]

well it came with a thm350 so thats what im gonna go with. I heard it was a tough tranny and it was on the motor and its free to me so that is that i guess. Thanks everybody. I love these forums.

all the best,
Marcus R.

[ucsicon]

I am taking out a THN400-700R4 and putting in a THM350, my question is, on the 400 there is a small wire harness that pluged in on the tail section of the transmisson, but there is no place to plug that wire harness into on the 350.

[ct91rs]

Originally Posted by ucsicon

I am taking out a THN400-700R4 and putting in a THM350, my question is, on the 400 there is a small wire harness that pluged in on the tail section of the transmisson, but there is no place to plug that wire harness into on the 350.

I believe the plug you're referring to is for the torque converter clutch, sounds like the converter in the 350 doesn't lock-up. It's not necessary, but your engine will rev a little higher when cruising, and you will get a bit poorer gas milage if the converter doesn't lock-up.