tranny gearing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tecky11 · 08-12-2009, 02:05 AM

i have a question for you, i have a t-19 TRANNY WITH THE GRANNY 1ST 6.42:1 with a dana 60 rear 3.73. an i have never understood who the gearing in trannies work, can someone explain it for me in stupid?

PanelDeland · 08-12-2009, 07:42 AM

Basically higher numbers=lower gearing.Lower gearing gives more torque and higher gearing gives more speed at a given engine RPM.The concept is that the gearing changes the speed of the output RPM.Tire size also has an effect on this.
Try plugging in some numbers to the calc I linked and it may help you understand.

http://www.csgnetwork.com/multirpmcalc.html

68gmsee · 08-12-2009, 09:14 AM

Quote:

Originally Posted by tecky11

i have a question for you, i have a t-19 TRANNY WITH THE GRANNY 1ST 6.42:1 with a dana 60 rear 3.73. an i have never understood who the gearing in trannies work, can someone explain it for me in stupid?

With that granny and rear end combo, you can pull stumps.

What truck do you have that has that low gearing?

tecky11 · 08-12-2009, 06:39 PM

68gmsee that is ony y 73 intl "3/4" ton truck

Gumby'sC20 · 08-12-2009, 06:58 PM

I have the same issue (3/4 ton ofcourse) and wish I could actually make use of 1st [granny] gear as an actual gear (i.e. starting from a stop) someday...haha.

tecky11 · 08-12-2009, 07:07 PM

well you could always pull the car behind you and save them some gas!!!!

Gumby'sC20 · 08-12-2009, 07:19 PM

Haha! Swing and a miss!....I'm not that nice

I still need to figure out what rear-end/transmission combo will suite my needs....

tecky11 · 08-12-2009, 07:28 PM

had to try!!!

turp mcspray · 08-12-2009, 07:46 PM

I know you've ridden a 10 speed right?
In 1st gear it is easy to take off but you are soon pedaling real fast but not moving very fast(in your truck the engine is turning real fast but the truck isn't going fast)
In 10the gear (4th in your truck) it is VERY hard to take off but when you are up to speed you can pedal at a comfy rate (engine turns at a slow speed). If you were to travel at speed in 1st gear you could not pedal fast enough to keep up and would fall off the pedals (your engine would spin to fast and come apart) The super low 1st gear in trucks makes it easy to get moving when you are hauling a trailer with a heavy load, but is not needed in normal driving conditions. If your engine makes great power at any given rpm, the more gears you have, the easier it is to maintain THAT rpm while still gaining speed. Is that simple enough?

tecky11 · 08-12-2009, 08:03 PM

makes perfect sense thanks!!!!

08-12-2009, 02:05 AM	#1
tecky11 Registered User Join Date: Jan 2009 Location: phoenix,AZ Posts: 451	tranny gearing i have a question for you, i have a t-19 TRANNY WITH THE GRANNY 1ST 6.42:1 with a dana 60 rear 3.73. an i have never understood who the gearing in trannies work, can someone explain it for me in stupid?

08-12-2009, 07:42 AM	#2
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: tranny gearing Basically higher numbers=lower gearing.Lower gearing gives more torque and higher gearing gives more speed at a given engine RPM.The concept is that the gearing changes the speed of the output RPM.Tire size also has an effect on this. Try plugging in some numbers to the calc I linked and it may help you understand. http://www.csgnetwork.com/multirpmcalc.html __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" Last edited by PanelDeland; 08-12-2009 at 07:43 AM.

08-12-2009, 06:39 PM	#4
tecky11 Registered User Join Date: Jan 2009 Location: phoenix,AZ Posts: 451	Re: tranny gearing 68gmsee that is ony y 73 intl "3/4" ton truck Last edited by tecky11; 08-12-2009 at 06:39 PM.

08-12-2009, 06:58 PM	#5
Gumby'sC20 Registered User Join Date: Jan 2009 Location: Binghamton, N.Y. Posts: 116	Re: tranny gearing I have the same issue (3/4 ton ofcourse) and wish I could actually make use of 1st [granny] gear as an actual gear (i.e. starting from a stop) someday...haha.

08-12-2009, 07:07 PM	#6
tecky11 Registered User Join Date: Jan 2009 Location: phoenix,AZ Posts: 451	Re: tranny gearing well you could always pull the car behind you and save them some gas!!!!

08-12-2009, 07:19 PM	#7
Gumby'sC20 Registered User Join Date: Jan 2009 Location: Binghamton, N.Y. Posts: 116	Re: tranny gearing Haha! Swing and a miss!....I'm not that nice I still need to figure out what rear-end/transmission combo will suite my needs....

08-12-2009, 07:28 PM	#8
tecky11 Registered User Join Date: Jan 2009 Location: phoenix,AZ Posts: 451	Re: tranny gearing had to try!!!

08-12-2009, 07:46 PM	#9
turp mcspray Registered User Join Date: May 2007 Location: Rapid City South Dakota Posts: 2,359	Re: tranny gearing I know you've ridden a 10 speed right? In 1st gear it is easy to take off but you are soon pedaling real fast but not moving very fast(in your truck the engine is turning real fast but the truck isn't going fast) In 10the gear (4th in your truck) it is VERY hard to take off but when you are up to speed you can pedal at a comfy rate (engine turns at a slow speed). If you were to travel at speed in 1st gear you could not pedal fast enough to keep up and would fall off the pedals (your engine would spin to fast and come apart) The super low 1st gear in trucks makes it easy to get moving when you are hauling a trailer with a heavy load, but is not needed in normal driving conditions. If your engine makes great power at any given rpm, the more gears you have, the easier it is to maintain THAT rpm while still gaining speed. Is that simple enough? __________________ Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299

08-12-2009, 08:03 PM	#10
tecky11 Registered User Join Date: Jan 2009 Location: phoenix,AZ Posts: 451	Re: tranny gearing makes perfect sense thanks!!!!



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