I got the ac delco wire plug for the 700r4 ($20 at dealer)

Wire in the one wire A terminal to a switch. It works but not quite like my monte carlo's 700

It wont lockup in 2nd. It does lockup in 3rd and 4th.

At 55-60 if i lockup in 4th my rpms go way down and i have absolutly no power. I can only get about 3 psi of boost before it downshifts to 3rd. It must be running some 1500 rpm or something. Whos got the math for 39" tires 4:10 gears in OD locked up going 55?

One wierd thing was this.....while testing in 3rd....i locked it up going about 55, i turned the switch off but it didnt unlock for a second or two. I thought that was wierd....my car does it right away.....but i guess it could be the different diesel convertor.

The TC seems to make a huge difference in rpm....you guys that have tachs what rpm drop do you see?....i guess about 400 from the sound of the motor.

in a gasser i used to see about 200-250 rpm drop with lock up.

chart says 1360 rpm , locked in 4th at 55. you won't be able to run 4th very well with those tires and that gear ratio. it will bog it out or make it downshift

I can run in 4th not locked though....so i assume the tc is cutting more than 250 rpm.

not nessesarily, 250 rpm puts you at about 1600. which is runnable. and the charts are always for a manual tranny, so auto may me slightly higher

60 mph, 4.10s, and 39s would put you at 1485 RPM with 4th gear lockup.

Math goes: 60 (MPH) x 4.10 (gear ratio) x 336 (given constant) = 82656

82656 / 39 (tire size) = 2120 (this would be the rpm for no OD)

2120 x .7 (for 700R4 OD, 30% OD) = 1485


I run 4.56s and 39s. The transmission won't shift to 4th until the speedometer says 45 which is actually about 55. I always drive a bit over 50 by the speedometer, that's about 65 or so. It's a linear equation, so the faster you're going, the farther off the speedometer is.

Ok hows this one then.....Im using 37" by the way as thats what the tires actually measure

Pulling my jeep in 3rd locked up @ 65 MPH im turning 2420

Is that ok for rpms? What if i do 70?

Can i run 2600-2800 pulling without hurting anything?

Dont think i can pull in OD @ 65 1694 rpm

If i use the previous equation then jodean at 65 you turn 2233 rpm and if you go for OD 1563 rpm is wath you get . pulling your Jeep i dont se why you cant do it it's not heavy load actually i do worst than that but i have a transmission oil temperature gauge . if i push too hard on the little thing on the floor then the temps increase then i back-off a little on the pedal .actually my pyromyther rise up much faster than my transmission oil

Ed

Nobody ever reccomends pulling in OD with a 700R4, that's a pretty good way to burn one up.

Those RPMs are fine. My truck, stock, was turning 3000 at 60 MPH. 31" tires, 4.56 gears, and a no overdrive. 6.2s are fairly durable, I don't think they have enough power to self destruct.

Nobody ever reccomends pulling in OD with a 700R4, that's a pretty good way to burn one up.

Those RPMs are fine. My truck, stock, was turning 3000 at 60 MPH. 31" tires, 4.56 gears, and a no overdrive. 6.2s are fairly durable, I don't think they have enough power to self destruct.


reccomend , why because nobody have a gauge ;) when it's time to let go then if you stay on the pedal the it's harmfull to the tranny . gauge is the secret to know whats going on in real time .

3,000 rpm won't destruct your engine it will distruct your fuel economy :D

this engine get torque between 1,800-2,200 higher than that for eache 100 rpm range you increase you loose 1 mpg

Ed

Could you give a scematic of how you did your wiring, or a picture? or both? I would like to have control over my lockup-

I just did the A terminal which is in another post recently. Give it 12v and its locked.

Its the outside terminal farthest forward.

AD
BC

i think was the final conclusion on the plug terminals.

I got better fuel milage when my truck was stock, even running 60 MPH.

Also, about the pulling in OD, you can if you want, I never will. New Venture Gear also specifically states to not pull in 5th gear with an NV4500. The 700R4 is a great transmission, it just wasn't made for much heavy stuff. I even have a 21" x 10" x 1.5" transmission cooler and still won't pull in OD, plus I can't keep the RPMs up with anything much heavier than my truck when it's empty.

I doubt i can pull in OD anymore with it locked up.

I pulled my jeep this summer in OD but unlocked as it wasnt working then.

It will pull much better in 3rd locked up though.....almost like another gear.

On the way back from las vegas where i purchased the truck the last 300 miles of highway where the speed limit was 60 i got about 20 mpg going 60 mph but there was no wind at all. I couldnt figure out why that tank lasted so long. About the rest of the trip i was getting about 8-9 mpg but i was going down I-80 about 75-80 MPH against the wind.

Yep, you're right, it almost feels like another gear! In fact, since my truck is so slow and has so little power, I usually lock the TC in 3rd gear at about 40 MPH to gain speed and then it'll just shift into OD whenever it gets there.

instead of locking it up manually, how would I lock it up automatically...I don't think it's locking up now on it's own...I just want to get in drive...I have no need to manually lock it up...I don't tow anything that weighs anything so no need...thanks for the help...

Chuck.

If you want to spend a few bucks and drop the pan to put in a pressure switch, you could get a kit from Bowtie Overdrives.

how do I know if that's what's wrong with it...is there a way to trouble shoot it...I was reading somewhere about hooking a test light to a wire under the dash by the fuse block somewhere, but for the life of me I can't find it now...

thanks...

Chuck.

easy way, when your driving at highway speed, keep your right foot on gas pedal. depress the brake slightly, enough to make your lights come on, but not enough to actually brake. if your lock up is working, you will feel it unlock and the rpm's to rise slightly. some lock up only in 4th, some 3rd and 4th, others 2-4. if its not locking up, there are a number of reason's. worry about that after you know for sure if its working

thanks...I'll check that out tomorrow on the drive to work...

Chuck.

update... I checked the lockup by pressing the brake when I was going down the road at around 50 and the rpms jumped up...so the lockup works...Diaric I can't thank you enough for the process...thanks

Chuck.

no problem. you can do the same for 2nd and 3rd and see which ones lock up, just so you know

I did that with third and it does lockup in third, didn't do it in second though...I'll have to try that...

Chuck.

thats really all you need , 3rd with lock up is good if your towing or lots of hills, keeps tranny cooler and better milage if it can lock up