Ok I've heard alot of different opinions about this swap. Some say 700R4 is better because it has overdrive and a better first gear ratio. Others say that the TH350 is a much stronger trans. I have one of each sitting in my garage waiting to go into my car. I have a 350 chevy with around 375 hp. and am trying to decide which trans to hook up to it. Both have shift kits installed, both are pretty fresh rebuilds. I just wonder if the 700R4 is better then why do they make a kit to put a th350 in. What is everyone's opinion on these. Thanx

 

the th 350 should last longer but the 700 has a better first gear and it has overdrive which is a real plus if you do a lot of hyway driving, etc.

 

so basically if I just do in town driving and the occasional trip to the drag strip I should be going with the th350? And then just through some better rear end gears in?

 

Not sure I'd use the word "should".

How far do you have to drive to the strip?

 

Both can be built strong and reliable. IMO, it's cheaper cost(th350) vs having overdrive(700r4). I've had both and their is no way I'd switch back to the th350. However, mine is an everyday car and it's a highway drive to get anywhere when you live in a town with a population of 380. 2150 rpm at 60 is much better than 3000 rpm at 60 to me.

 

Go with the 700R4. It should hold up, but if not, you got a TH350 waiting for you at home

 

Performance wise at the track you will not see much difference if any between the 2, not that I miss the 700r4 at all, but the OD is nice. I was running a rebuilt 700r4 with all the Trans-Go stuff and Coan 2800 stall. Installed a TH375 shortly there after since my end goal is a 10 sec street car and I don't want to have thousands wrapped up in a trans to hold the power, anyways, the TH375 has a 3500 stall and the ET's and finish line rpm were identical. The 700 should more than handle the 375hp you got, but again I do not miss that heavy, TV cabled beast one bit.

 

Thanx to all who helped.

 

Sorry to jump in to this thread. I’m in a similar situation where I have a TH350 fitted at present & just changed the diff out which has a 3.27 gear ratio. Our car is a cruiser & now at 60mph (100kph) she’s sitting at 2800rpm! Would a 700R4 with overdrive give us better economy?

 

700R4's overdrive is .7
Therefore, theoretically, your 2800 rpm would drop to 1960.

 

Excellent that’s just what I need! Our car is an 82 Indy Pace car. Can we get away using the factory shifter etc? How is the overdrive actuated?

I have just found a TH200R4 fully reconditioned & from what I understand will just about bolt straight in.

 

I have had both transmissions in my car(it had a super T10 1982-93) i doubt you will see any significant MPG increase and I liked the T350s 1-2 ratio spread better.The t350 to t700 swap was pretty easy and the 700 i put in(85 model,8-84 built) has been very good with 3:27s i think i would stay t350-but if there is a good t700 and associated swap parts lying nearby it is an easy swap

 

You need a shifter (and cable) from a later model that had the 700R4 because there is an extra detent for OD.
The TCC or torque converter clutch is electrically activated. The ECM in computer-controlled models handled
this, but there are aftermarket kits for doing this, or you can even wire it to a simple switch. Look at the export
or Canadian wiring diagrams if you want it the same as factory.