what gear ratio? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

og350 · 04-08-2012, 11:24 PM

ok guys what gear ratio are you running? right now i have a 92 2wd rcsb, 383/nv3500 with 3:08 gears i want to swap rear ends to either 3:42 or 3:73 but dont want to run down the freeway at 3000rpm if i go to high. right now at 70mph it is just under 2000rpm but is slow off the line. let me know what you guys think.

scotts62 · 04-09-2012, 04:53 PM

3:73, cruises about 2500 @70mph but could be a little off because its been a while since i drove it

**Already Gone** · 04-09-2012, 10:42 PM

My 94 Burb with 3:73's is at 2200 at 70MPH. My preference is for 3:42's so that you are at 2000 at 70MPH and your fuel mileage is a lot better around town cause the truck doesn't rev as high between shifts.

cannaert · 04-11-2012, 07:48 PM

I have 3.73s in my truck and hate them with a passion, but I tow with it.

I would kill for a set of 3.08s for my truck but SF 14B only go down to 3.42s.

**G&R's57GMC** · 04-11-2012, 11:59 PM

I've got 3.73's with 30" tires and I tow with it. Its just rite for my Tahoe and its a rocket off the line.

rockachevy · 04-12-2012, 01:45 AM

i got the 3.42 in my truck and i get 21 hwy at 2300RPM even with my truck being a 4x4 heavy half w/ a mild built 355 and off road tires

Dobok · 04-12-2012, 08:01 AM

I have a 3.08 and it is a dog off the line. I just got a newer diff. with 3.42 gears and posi but have yet to put it in. I can't wait to try it !!!

mwjames · 04-12-2012, 12:40 PM

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piecesparts · 04-12-2012, 03:22 PM

give the tire size and which tranny you have.

My 91 Chevy had a 3.42 geared rear end with a 700 R4 OD tranny. I ran a lower profile tire that was at 28" tall. This gave me an RPM of 2050 to 2100 at 70 MPH. That worked great for this combination and I averaged 19 mto 20 MPG with the truck.

og350 · 04-15-2012, 09:15 AM

Quote:

Originally Posted by mwjames

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How am is posting a question a classified add?
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og350 · 04-15-2012, 09:18 AM

Right now I am running a nv3500 5 speed with 275/55/15 rear tires. I would like to swap the 5 speed for a 700r4 down the road.
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04-08-2012, 11:24 PM	#1
og350 Registered User Join Date: Apr 2008 Location: river falls, Wisconsin Posts: 236	what gear ratio? ok guys what gear ratio are you running? right now i have a 92 2wd rcsb, 383/nv3500 with 3:08 gears i want to swap rear ends to either 3:42 or 3:73 but dont want to run down the freeway at 3000rpm if i go to high. right now at 70mph it is just under 2000rpm but is slow off the line. let me know what you guys think.

04-09-2012, 04:53 PM	#2
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,240	Re: what gear ratio? 3:73, cruises about 2500 @70mph but could be a little off because its been a while since i drove it __________________ Scott 93 crew cab build Project 62

04-09-2012, 10:42 PM	#3
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,073	Re: what gear ratio? My 94 Burb with 3:73's is at 2200 at 70MPH. My preference is for 3:42's so that you are at 2000 at 70MPH and your fuel mileage is a lot better around town cause the truck doesn't rev as high between shifts. __________________ 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

04-11-2012, 07:48 PM	#4
cannaert Registered User Join Date: Mar 2012 Location: Hartland, MI Posts: 43	Re: what gear ratio? I have 3.73s in my truck and hate them with a passion, but I tow with it. I would kill for a set of 3.08s for my truck but SF 14B only go down to 3.42s.

04-11-2012, 11:59 PM	#5
G&R's57GMC Senior Member Join Date: Aug 2010 Location: Shasta Lake, CA. Posts: 1,619	Re: what gear ratio? I've got 3.73's with 30" tires and I tow with it. Its just rite for my Tahoe and its a rocket off the line.

04-12-2012, 01:45 AM	#6
rockachevy Registered User Join Date: Oct 2011 Location: lacygne, kansas Posts: 51	Re: what gear ratio? i got the 3.42 in my truck and i get 21 hwy at 2300RPM even with my truck being a 4x4 heavy half w/ a mild built 355 and off road tires

04-12-2012, 08:01 AM	#7
Dobok Registered User Join Date: Oct 2011 Location: St.Andrews,Manitoba, Canada Posts: 276	Re: what gear ratio? I have a 3.08 and it is a dog off the line. I just got a newer diff. with 3.42 gears and posi but have yet to put it in. I can't wait to try it !!!

04-12-2012, 12:40 PM	#8
mwjames Registered User Join Date: Feb 2012 Location: Montgomery, Al. Posts: 73	Re: what gear ratio? Please note that you must be a supporting member to post classified items. This includes but is not limited to What Its Worth, Want To Buy, Want To Trade, and For Sale. Please consider supporting the forum by subscribing. Further information on the subscription levels available are located here If you need any further assistance with that please contact any Admin for help. Posted via Mobile Device Last edited by scotts62; 04-12-2012 at 06:04 PM. Reason: For sale non sub

04-12-2012, 03:22 PM	#9
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: what gear ratio? give the tire size and which tranny you have. My 91 Chevy had a 3.42 geared rear end with a 700 R4 OD tranny. I ran a lower profile tire that was at 28" tall. This gave me an RPM of 2050 to 2100 at 70 MPH. That worked great for this combination and I averaged 19 mto 20 MPG with the truck. __________________ Frank

04-15-2012, 09:18 AM	#11
og350 Registered User Join Date: Apr 2008 Location: river falls, Wisconsin Posts: 236	Re: what gear ratio? Right now I am running a nv3500 5 speed with 275/55/15 rear tires. I would like to swap the 5 speed for a 700r4 down the road. Posted via Mobile Device



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