My Yank SS3600 went in 2 weeks ago, and there is a slipping problem with either the trans or the converter. I need to know if any of you guys with a 9.5 inch converter in your 700R4 have experienced this. Here's the beef:

I know what it's supposed to feel like after lockup and it's NOT RIGHT! IT shoujld be zero slip, just like the stock converter when locked up. I'm getting increased heat and poor gas mileage so we've got to figure this out

At any cruising speed in 3rd or 4th gear, it still revs freely between 2500-3000 with subtle throttle increase, even though the computer thinks it's locked.

The computer is commanding lockup correctly, and I can feel when it "wants" to lock up. The rpm's do drop slightly when the computer commands lock, and I hooked up a test light and payed close attention to what is going on, and everything electronically is correct.

So it's locking but it's not, if that makes sense. . Mike at Yank says it's a line pressure deal.

Fluid is full (type f). Any factual response is appreciated!

 

BTW 80k on the tranny and it never did this before the swap.

 

I have a SS3600 in my car (about 300 miles on it) the lock up is set at 51mph in the chip and with how soft the converter is the lock up is harder than each gear shift at part throttle. I installed a new Pro-Built limited streeet trans at the same time. Low line pressure can make a converter slip in lock up.

Do you have a shift kit???

Is the T.V. at full max???

Do you know what your line pressure is???

Can you program chips???

My cars wide open throttle locks up at 4,475 rpm in third gear and will pull the motor down to 4,125 rpm this takes .300 of a second for the lock up and you can feel it.

Jerry

 

No shift kit

TV cable is in the middle somewhere

No clue what the line pressure is

We have all the stuff to burn chips but I have to rely on a friend to program them

 

First, make sure the TV cable is set correctly. Second, did you remove the checkball assembly in the input shaft when installing the new TC?

 

Maybe the type F fluid is the problem? My yank locks up and drives like the stocker.

 

89gta383

What ya running for fluid?

 

I was afraid of the checkball deal. It's still in there.

Rats! I trusted the performance shop to tell me about any tranny mods needed for the 9.5 inch converter, since they claim to have installed several Yanks and Vigilante's in 700's.

Dana does this happen more often than not when you leave the check ball in there with a 9.5" verter? Should I expect them to know that it should have been removed? If so I'm going to express a little dissatisfaction.

 

Yank told me that type F is what he recommends. That was the first thing he asked.

 

I use the valvoline dexron III from autozone. I don't think the type F is the right stuff.

 

89gta383

How often do you change it out? Have you ever had any trans problems, what type of abuse does your trans see?

Anyone ever run the redline high temp tranny fluid?

 

I've never changed it, unless I'm changing convertors or breaking stuff. I broke the tranny 3 weeks ago, and it is getting worked over now. I got about 30 passes with et streets on the tranny before it went south, plus driving everywhere, the nitrous bottle hurt it bad. I burned up the 2-4 band and the 3-4 clutch pack, and broke the governor.

 

On second thought, I had dexron 3 in there before the swap, and we didn't do a complete flush. Right now it's probably half Dexron, half type F.

Could that be the problem right there?

 

The tranny experts would have to answer that, but I know from what they've said in the past the type f is for the older trannies and dexron III is the best for the 700, somebody correct me if I'm wrong.

 

how much power can you put to a locked up converter?
I was under the impression that lock up was for highway cruising and other types of just cruising and all other aggressive driving, the converter should not be locked up. whats the deal?

 

If the checkball & capsule are not removed, it will make the lockup slow and really not that noticeable, but it should still have lockup. With the small diameter torque converters, I leave it out unless the customer does not want a firm lockup. In that case I use the checkball capsule from a 4L60E, as this will double the oil that the 700R4 capsule supplies. Make sure the TV cable is adjusted correctly. Use a Dexron III or equivalent, no type "F". The torque converter lockup is for cruising only, it should not and you do not want it to lockup under WOT, especially when drag racing as this will slow down the vehicle. Make sure you do not have a blown fuse, and make sure the wiring is connected correctly, as these will prevent lockup.

 

if im at like 1800 to 2200pm locked up 4th gear at say 45-55ish mph my converter acts like it wants to rev paste the lockup (2800 to 3000 stall). It only does this if you try to give a lot of throttle angle as you would with a standard transmission in 5th gear. Is this due to my 475 ft pound torque figures or is somthing gone array?
at 70 mph you can put a lot of throttle angle to it without issue. but the revs are alot higher also and the motor feels alot less loaded.