emttrevor

Wow Im still confused I guess there is no real answer other than trial and error but of course error in this case means pulling the tranny each time if I get it wrong. Most of my driving is street of course but i like to drag the occational bow tie from stop light to stop light, ok mor than occationally but I want a dependable stall speed that wont screw up my tranny every couple of months. Now as of Monday Ill be adding 3.55 gears to the rear end also and I believe that has to do with stall speeds also. I have the 2500 in the car now cause the so called tranny rebuilder reccomended it however it just seems like its slipping when cruising guess Im not used of it he says its ok but I have been wondering if I should go back to the 2000.

Norm Peterson

If anything, it should slip less with 3.55's than with whatever you have now (which I think are 2.83's, never mind that that number sounds like it belongs on some kind of Chevy instead ).

That does assume that you only maintain your current demands for acceleration instead of getting hooked on the crack pipe of the stronger acceleration soon to become available.

The reasoning is twofold. First, you'll be running at higher rpms all the time, meaning at or above stall speed for more of your driving. And second, that (assumed) constant acceleration demand will require less throttle and less slip to achieve.

I think I'd include an auxiliary transmission fluid cooler sooner rather than later.


BTW, thanks for prodding me into finding this

Norm

groho

When I had my tranny built, the builder made it very clear that the stall RPM needs to be above or below your routine cruising RPM or else you're gonna over heat your tranny and the converter is going to lock/unlock/lock, etc. In other words, without specifics, your 3:55 gears likely puts you at 25-2600 RPM at 45 MPH, correct? Well, your stall RPM is 2500. I bet if you cruise at 3000 RPM you don't have a problem, same at 2000 RPM. Food for thought.

KMatch

Kinda, sorta... If you have a 2500 stall and cruise at 2000, you'll be slipping the converter more and raising the heat level (potentially). I understand newer models are better, but have yet to get any decent response from ANY builders and I've dropped a few a request 'cuz I'm in the same boat - not happy with my 2500 and looking for something in the 3000 range. No one wants my money bad enough to write more than 2 lines of response to a detailed request. For $500+, I'd be more than willing to respond to emails with loads of info! Their loss...