dont laugh im having issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dammitmitchell · 07-31-2008, 04:06 PM

ok so i believe ive totally pulled what is known as an brain fart..
be it the beer, lack of shop time lately, or being in a house full of women (wife n daughters mother-in-law etc..etc)
i have this question..

3.73:1 is a "high gear" for a ring and pinion right?>
meanwhile
4.56:1 is low correct??
i was going to order new gears for my truck, and i poulled a brainfart
so the closer i get to a 1:1 ration the "higher the gear" right?
ugggh help me please im soo dumb today

77 350 Shorty Wide · 07-31-2008, 04:10 PM

Hi Ratio = Low number 2.73 to 1
Low Ratio = High Number 4.56 to 1

That's OK I get the farts everyday

Have a good one, Terry

**Already Gone** · 07-31-2008, 04:38 PM

I always think, the higher the number the lower the gear !!

wicked_sky_gazer · 07-31-2008, 04:48 PM

Ok im not brain fartin i just dont know for sure.... what are the ratio ranges better uses, such as highway, drags, towing... ect?

**N2TRUX** · 07-31-2008, 06:37 PM

It really depends on the application. My experience has been that 3.08 is good for fuel mileage, but lacks in low end grunt. A 3.42 is a really good all purpose gear that gets decent mileage and pulls well down low. You give up at least one mpg with a 3.73 but it pulls great down low and gives lots of torque through out the power band.

This is based on 2wd SBC equipped trucks that I have owned.

68Timber · 07-31-2008, 06:54 PM

I've been playing around with a tire/gear/tranny/rpm/mph calculator and 4.10's look ideal with a 700R4 and 28" tire...

slugish · 07-31-2008, 10:17 PM

weekend drag machine go with 4.10 / otherwise go wit h 3.73-- the perfect gear for both street & strip with a 700 r4

dammitmitchell · 08-01-2008, 01:01 PM

i have an 83 with 6in of lift
37's
and a 350attached to 4speed w granny low..
maby i should ask in the 4x4 forums...
hmmmm
i suck at this sometimes im just soooo stumped i wasfiguring i'll lift my truck off teh gorund next week rotate the tires to guesstimate my gear ratio and move a noticible amount towards the "lower number"
i need a tach bad, but to be honest i rapped out my motor the other day FullOpen throttle and only got to 47 MPH in third gear from a dead stop...
that sucks.. but hell the truck can tow a house no problem
but first gear is utterly useless..

tobiahr · 08-01-2008, 01:32 PM

are you sure the transfer case isn't in low range? you should be going alot faster than 47 in 3rd gear, granny gear or not. even with 4.10 rear you would be going faster than that

piecesparts · 08-01-2008, 01:43 PM

Quote:

Originally Posted by N2TRUX

It really depends on the application. My experience has been that 3.08 is good for fuel mileage, but lacks in low end grunt. A 3.42 is a really good all purpose gear that gets decent mileage and pulls well down low. You give up at least one mpg with a 3.73 but it pulls great down low and gives lots of torque through out the power band.

This is based on 2wd SBC equipped trucks that I have owned.

I swapped my 84 from a 3.42 to a 3.73 and gained low end pull and in the end stayed the same on mileage, due to putting the engine in the power band properly.

tobiahr · 08-01-2008, 02:07 PM

ok here is a way to get in the ball park on the rear end and tranny...4th gear (counting the granny as first) should be 1 to 1 ratio
http://www.bgsoflex.com/rpmmph.html

dammitmitchell · 08-01-2008, 02:04 PM

t case was in 2w high.. that definatley works the 4wd is awsome but i took the axes from a buddy's 84 diesel 4x4....
so im not sure y know.. it'll cruise at 60 no problem.. it jsut takes a minute to get there..
and the 47 was me trying to see how fast my truck can get up and go...
blah!
but it cruises fine i usually roll around town in third (40-45)...

07-31-2008, 04:06 PM	#1
dammitmitchell the pollock Join Date: May 2008 Location: abilene, texas Posts: 4,423	dont laugh im having issues ok so i believe ive totally pulled what is known as an brain fart.. be it the beer, lack of shop time lately, or being in a house full of women (wife n daughters mother-in-law etc..etc) i have this question.. 3.73:1 is a "high gear" for a ring and pinion right?> meanwhile 4.56:1 is low correct?? i was going to order new gears for my truck, and i poulled a brainfart so the closer i get to a 1:1 ration the "higher the gear" right? ugggh help me please im soo dumb today __________________ Jack of ALL trades, Master of none.. (but one... procrastination) Army vet 02-08 RIP El Jay! Miss you brother! http://67-72chevytrucks.com/vboard/s...d.php?t=343538 http://67-72chevytrucks.com/vboard/s...d.php?t=386042

07-31-2008, 04:10 PM	#2
77 350 Shorty Wide Registered User Join Date: Dec 2006 Location: Yakima, WA Posts: 325	Re: dont laugh im having issues Hi Ratio = Low number 2.73 to 1 Low Ratio = High Number 4.56 to 1 That's OK I get the farts everyday Have a good one, Terry

07-31-2008, 04:38 PM	#3
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: dont laugh im having issues I always think, the higher the number the lower the gear !! __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

07-31-2008, 04:48 PM	#4
wicked_sky_gazer Living Legend Join Date: Oct 2007 Location: owasso oklahoma Posts: 160	Re: dont laugh im having issues Ok im not brain fartin i just dont know for sure.... what are the ratio ranges better uses, such as highway, drags, towing... ect? __________________ '81 c10 sw 355cid roller motor 350turbo with stage two shift kit, poor rear end gearing, not sure peg speed... speedo is mia.. project is temporarily on pause again... Thankyou wonderfull economy.. check it out Im not to worried i have an uncaning ability to save myself from some weeeiiirrd crap East Ok meet East Ok date Tony Last edited by wicked_sky_gazer; 07-31-2008 at 04:48 PM.

07-31-2008, 06:37 PM	#5
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: dont laugh im having issues It really depends on the application. My experience has been that 3.08 is good for fuel mileage, but lacks in low end grunt. A 3.42 is a really good all purpose gear that gets decent mileage and pulls well down low. You give up at least one mpg with a 3.73 but it pulls great down low and gives lots of torque through out the power band. This is based on 2wd SBC equipped trucks that I have owned. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

07-31-2008, 06:54 PM	#6
68Timber I know the pieces fit Join Date: Nov 2007 Location: MONTGOMERY, AL Posts: 5,523	Re: dont laugh im having issues I've been playing around with a tire/gear/tranny/rpm/mph calculator and 4.10's look ideal with a 700R4 and 28" tire...

07-31-2008, 10:17 PM	#7
slugish Slugish Join Date: Jan 2005 Location: Earlysville, Va. Posts: 1,024	Re: dont laugh im having issues weekend drag machine go with 4.10 / otherwise go wit h 3.73-- the perfect gear for both street & strip with a 700 r4

08-01-2008, 01:01 PM	#8
dammitmitchell the pollock Join Date: May 2008 Location: abilene, texas Posts: 4,423	Re: dont laugh im having issues i have an 83 with 6in of lift 37's and a 350attached to 4speed w granny low.. maby i should ask in the 4x4 forums... hmmmm i suck at this sometimes im just soooo stumped i wasfiguring i'll lift my truck off teh gorund next week rotate the tires to guesstimate my gear ratio and move a noticible amount towards the "lower number" i need a tach bad, but to be honest i rapped out my motor the other day FullOpen throttle and only got to 47 MPH in third gear from a dead stop... that sucks.. but hell the truck can tow a house no problem but first gear is utterly useless.. __________________ Jack of ALL trades, Master of none.. (but one... procrastination) Army vet 02-08 RIP El Jay! Miss you brother! http://67-72chevytrucks.com/vboard/s...d.php?t=343538 http://67-72chevytrucks.com/vboard/s...d.php?t=386042

08-01-2008, 01:32 PM	#9
tobiahr Registered User Join Date: Nov 2007 Location: Lincoln NE Posts: 513	Re: dont laugh im having issues are you sure the transfer case isn't in low range? you should be going alot faster than 47 in 3rd gear, granny gear or not. even with 4.10 rear you would be going faster than that

08-01-2008, 02:07 PM	#11
tobiahr Registered User Join Date: Nov 2007 Location: Lincoln NE Posts: 513	Re: dont laugh im having issues ok here is a way to get in the ball park on the rear end and tranny...4th gear (counting the granny as first) should be 1 to 1 ratio http://www.bgsoflex.com/rpmmph.html

08-01-2008, 02:04 PM	#12
dammitmitchell the pollock Join Date: May 2008 Location: abilene, texas Posts: 4,423	Re: dont laugh im having issues t case was in 2w high.. that definatley works the 4wd is awsome but i took the axes from a buddy's 84 diesel 4x4.... so im not sure y know.. it'll cruise at 60 no problem.. it jsut takes a minute to get there.. and the 47 was me trying to see how fast my truck can get up and go... blah! but it cruises fine i usually roll around town in third (40-45)... __________________ Jack of ALL trades, Master of none.. (but one... procrastination) Army vet 02-08 RIP El Jay! Miss you brother! http://67-72chevytrucks.com/vboard/s...d.php?t=343538 http://67-72chevytrucks.com/vboard/s...d.php?t=386042



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