Help with waking truck up from a stop please
#11
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If it were me, I would go with the tb modified stall from Circle D at 3k, and then decide if you need 4.10's. If your gonna be towing, let them know so they can make it a little tighter for you. That will also help with dd'ing. I love the rpm's my 3.73's run at on the highway, I dont think I'd be happy with 4.10's cruising at 80mph.
#12
I have a 07 new body style crew cab with a 5.3. It is stock except for a Black Bear Tune and 22" wheels. It is still a dog from a stand still until 2500ish rpms and then it will move. What would you do to wake it up? My RPO codes are GT4 G80 so I have 3.73 Posi correct?
I am assuming gears but dont want to kill my mileage as I drive 30 miles highway to and from work 5 days a week. Would 4.10s do the trick? ...
I am assuming gears but dont want to kill my mileage as I drive 30 miles highway to and from work 5 days a week. Would 4.10s do the trick? ...
The converter choice depends on your plans...since you DD 30 miles on the highway each day, you'll want to find a nice balance between the converter, cam, and gears. ...when I had 33" inch tall tires, 3.73's, & the factory converter, I couldn't do any better than a 2.5 60' time. If you could ditch the 22's and go to a shorter combo, that will definitely help also. If you love your tire/wheel combo, you'll want to go steeper on the gear to help compensate.
Let's say that you have or get a 31" tall tire, then I'd probably go with the 3200 converter that I mentioned above, 4.10 to 4.30 gears (I want 4.10's to go with my 31" tall wheel/tire combo), and maybe a mild Comp 212/218, or Crane 210/218, or a 214/220 style cam, so that when the converter flashes up, there's some meat in the powerband to get you moving.
Let's say that you have or get a 31" tall tire, then I'd probably go with the 3200 converter that I mentioned above, 4.10 to 4.30 gears (I want 4.10's to go with my 31" tall wheel/tire combo), and maybe a mild Comp 212/218, or Crane 210/218, or a 214/220 style cam, so that when the converter flashes up, there's some meat in the powerband to get you moving.
Peach, I think he's givin some great advice on the "balance" thing.
eatapeach on a 31.5" tall, in order to figure out what RPM's u would be spinning w/. 4.10s vs the 3.73s that u have, I forgot exactly how to figure it, but u wouldn't be > 450 RPMs. I know that's kinda vague, but on a taller tire, it's not too big a difference. On shorter tires, it's of greater difference.
#13
I changed over from 373's to 410's 2 months ago and it made a big diff. with the low end, At 75 mph RPM's are at 2400 w/31in tire in OD.. not a problem, I think its the perfect gear for this truck, I want to install a tbss converter to help a little more...
#14
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I am also interested in a TC change. Could someone please explain how a 2800 or a 3200 stall is different from stock? Pros and cons. I tow a good bit of weight so I do not want to endanger my trans with the higher heat a new TC can make.
I also like the 3.73 on the highway but the 4.10s really help with the takeoff and towing capacity.
I also like the 3.73 on the highway but the 4.10s really help with the takeoff and towing capacity.
#15
I am also interested in a TC change. Could someone please explain how a 2800 or a 3200 stall is different from stock? Pros and cons. I tow a good bit of weight so I do not want to endanger my trans with the higher heat a new TC can make.
I also like the 3.73 on the highway but the 4.10s really help with the takeoff and towing capacity.
I also like the 3.73 on the highway but the 4.10s really help with the takeoff and towing capacity.
1st, stock TC is ~1600 RPMs. Not the 28-3200 u mentioned. When u mash a stocker it goes or "flashes" to 1600, the modded one "flashes" to what was spec'd. It multiplies the torque, & keeps the shift extensions to smaller amounts. You know how when u give it gas, say on the 1-2 shift. The amount it falls back or down is / are shift extensions. By not droppin as much, u keep it in the powerband.
OH IDK if u have a stock trans cooler, but if ya tow, & do not have 1, get 1!! Even on a stock stall. A $100-140 cooler (or less on smaller ones) is just cheap insurance to extending your tranny's life. A trans temp gauge would be a help too. How much wtg. are u towing?
Pros:They're fun, esp. off idle. I couldn't imagine what a bigger stall would do for the fun factor. Many get better times.
Some say better MPG (see cons on this too).
Cons:Ya gotta remove trans to do, can use more gas (stall speed dependent & your foot), lockup may take gettin used to, & good ones don't come cheap. Or ya, may have to tune or not, stall speed affects this too.
Last edited by fastnblu; 07-12-2010 at 01:38 PM.
#16
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Thanx a lot! I have a 2500 so it comes with a trans cooler stock. I have been considering investing in a larger one, just dont know where to find a good one. Does the 3500s have larger coolers? I tow everywhere from 2k to about 15-16k lbs. I beat on this truck at times.
It would seem a mild TC could help with low speed take off and towing cuz it wouldnt have to work as hard to get back to higher rpms. Am I wrong? I have seen fellas on here saying there trans can get up to 280+ degrees, I definatly dont need that. I have never seen mine get over 190.
Thanx again!!
It would seem a mild TC could help with low speed take off and towing cuz it wouldnt have to work as hard to get back to higher rpms. Am I wrong? I have seen fellas on here saying there trans can get up to 280+ degrees, I definatly dont need that. I have never seen mine get over 190.
Thanx again!!
#17
One minor correction: the stock stall speed in the 4L60E trucks is 1800rpm. The diesel HDs have a 1600rpm TC as does all engines with the 6L80/6L90 transmissions, while the 4.2L TB/envoy stalls at 2400 and those with envoy denalis (5.3) who swapped in the 4.2's TC stall around 26-2700 and should be the same in the 5.3L 4L60E trucks.
If you do a lot of towing, stick with a 12" TC or get a 10" with multiple TCC clutches. Beyond the difference in friction area between a single 12" lock up clutch and a single 10", the 12" has a longer leverage arm on the axis of rotation which is a much bigger advantage than most realize. I'd guess a 10" with two lock up clutches should be as strong if not a little stronger than the single 12" clutch. I can't recommend a specific brand or model since I tow a lot and haven't researched it much... I like having the stock TC for what I do. I'll be eventually going 4L80E with a twin-screw supercharger so bottom end won't matter much given the boost a positive-displacement blower makes at low rpm.
Bow-Tie: you shouldn't need a lot of stall since the 6L90's have a brutal 1st gear and tight spacing between all gears. I personally wouldn't go over 2500 on the stall speed given your situation. YMMV
If you do a lot of towing, stick with a 12" TC or get a 10" with multiple TCC clutches. Beyond the difference in friction area between a single 12" lock up clutch and a single 10", the 12" has a longer leverage arm on the axis of rotation which is a much bigger advantage than most realize. I'd guess a 10" with two lock up clutches should be as strong if not a little stronger than the single 12" clutch. I can't recommend a specific brand or model since I tow a lot and haven't researched it much... I like having the stock TC for what I do. I'll be eventually going 4L80E with a twin-screw supercharger so bottom end won't matter much given the boost a positive-displacement blower makes at low rpm.
Bow-Tie: you shouldn't need a lot of stall since the 6L90's have a brutal 1st gear and tight spacing between all gears. I personally wouldn't go over 2500 on the stall speed given your situation. YMMV
#18
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A good way to help understand how a stall acts is to get on youtube and watch videos of trucks with different sized stalls and how they drive. If you tow that often, you need to invest in a tru-cool 40,000 regardless. I think their under $100 on ebay.
#19
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Thanks fellas for all the clarification. I am going to do alot of research before choosing a TC. If I have a 1600 stock stall now, I'm assuming a 2000 or 2200 stall would be just about right.
Is true-cool trans coolers good quality? If I change the stock cooler, will the new one void my warrenty on the trans? I only have 13500+ miles on this truck and have alot of warrenty life left.
Thanks again fellas, lots of good information here.
Is true-cool trans coolers good quality? If I change the stock cooler, will the new one void my warrenty on the trans? I only have 13500+ miles on this truck and have alot of warrenty life left.
Thanks again fellas, lots of good information here.