I blew my 700R4 after I put in my 350. The motor is too strong for the trans and I'm afraid of shifting my trans at too high of an RPM and blowing the trans. I have since rebuilt the 700R4 (budget reasons).

I also have 4.10's and that causes the trans to shift incredibly early (like 1500 rpm).

If I were on the dyno, and had the car in 4th (OD), and took the car up to about 6k, would I be in danger of blowing the trans?

Is more of the damage done while shifting or just when the hp and torque are being passed through the trans???

Steve

 

i know nothing about this subject, but I do think as long as you're not powershifting the trans it will hold. and I'm also fairly sure you dyno in D (3rd gear is 1:1) and not OD.

 

if you do a chassis dyno, it's only done in one gear so that's not a problem. unless you're running something way stronger than what's in your sig, i can't quite see a reason to not run a 700R4 or 4L60. they most certainly can be made to hold up to that amount of power without a problem. hell, the one i was using in my sonoma gt would have taken it without any complaints.

 

The dyno places less load on the drivetrain than you'd have from accelerating the weight of the car on the street so you'd be safe. Dyno pulls are at WOT and your 700R4 probably won't shift into O/D at WOT anyway.

 

 

All that being said I have to add this;

I have personally witnessed, along with 20+ other individuals, a member of this board puke a 700R4 on a chassis dyno.

The cause wasn't the dyno or the engine but a bad rebuild which was warranteed.

Just noteing that bad juju can happen at any time.

 

Sure, but the point is you're more likely to have bad juju happening on the street than you are on a dyno.