![]() |
|
![]() |
#1 |
Junior Member
Join Date: Dec 2006
Location: sacramento
Posts: 54
|
Gears
Hey everybody, right now I have a open diff. w/373's. I bought a complete rear end w/limited slip but it has 307's.do you think I should just put the whole rear end in and run the 307's? would I notice any differance?
|
![]() |
![]() |
![]() |
#2 |
Randy churchill
Join Date: Apr 2003
Location: Pearsall, Tx
Posts: 356
|
Re: Gears
yep, the 307's will lower your highway rpms, which will probably get you better mileage. It will be a little slower on take off, which depends on your engines power. It might just slow you 0-60 time a half second to a whole second maybe more if your engine is weak.
__________________
1983 GMC K2500 6.2 diesel 4" lift on 35x12.50 tires 2008 GMC 2500HD 6.6 diesel 3" lift on 315 75 16X10 2003 Jeep Rubicon 4.5" short arm lift 1985 Jeep CJ7 30k in parts and still adding up |
![]() |
![]() |
![]() |
#3 |
Senior Member
Join Date: Dec 2003
Location: Colorado
Posts: 351
|
Re: Gears
Oh you'll see a big difference. Especially light to light.
If you're doing a lot of city driving you may not notice much change in the gas mileage, but highway driving will improve.
__________________
The Fastor Pastor '68 swb, 447 BBC/ 6-71 Weiand, Dual 950 Bigs Carbs/ 2 1/2" Header tubes - 4" collectors/ M-21 4speed: '70 swb; TH-400 - bagged & shaved. Looking for new engine or parts. Wife - Original {A Real Classic!} ![]() |
![]() |
![]() |
![]() |
#4 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: Gears
highway revs will seem almost like an overdirve... if i remember right, 65 is right at 2400 RPM with 28 inch tall tires.
|
![]() |
![]() |
![]() |
#5 |
Junior Member
Join Date: Dec 2006
Location: sacramento
Posts: 54
|
Re: Gears
I am real happy with the way it is now. I dont want to loose power out of the gate.I think I'll wait and find sombody to show me how to put the eaton in my carrier & use my gears.MY truck is 72 1/2 ton gmc 5 lug, the other rear end is 72 1/2 ton chevy 5 lug. Theese should trade right I dont know why but the chevy looks smaller.mabey I am seeing things again.
|
![]() |
![]() |
![]() |
#6 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
|
Re: Gears
4.56 would be loads better for take off!!!
![]() Just kiddin!! I had 3.07s in a 76 with 350 and 350 and it was perfect with 32 inch all terrains (4x4) Not a dragster for sure off line but it was a good all around gear. |
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
|
Re: Gears
i have a 72 with stock 350 (175hp i think) and 350 tranny and 31s(thats what it says on the sidewall) with the 3.07s and mine runs fine and if i had more hp it would drag fine ofcourse thats on the street but still, and if urs is a DD the 3.07s will actually be an improvement
-steven ![]()
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME Last edited by GREASEMONKEY72; 12-15-2006 at 11:46 PM. |
![]() |
![]() |
![]() |
#8 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
|
Re: Gears
Quote:
![]()
__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
|
![]() |
![]() |
![]() |
#9 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
|
Re: Gears
It Will Be A Dog On Takeoff And A Super Dog If You Tow Or Haul. And Your Speedo Will Be Off Also.
|
![]() |
![]() |
![]() |
#10 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
|
Re: Gears
I would go with the 307's as well. mine works great around town and on the highway with 29" tires. the posi may be a bad isea on snowy/iced roads.
|
![]() |
![]() |
![]() |
#11 |
Senior Member
Join Date: Dec 2005
Location: Dothan Alabama
Posts: 2,604
|
Re: Gears
If all your after is not losing anything off the line don't go with the 307s
__________________
Kevin 1967 C-10 swb fleetside 1968 C-10 stepside 1999 Z71- sons dd 1999 2wd silverado-my dd 2003 Tahoe- wifes dd |
![]() |
![]() |
![]() |
#12 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
|
Re: Gears
3.40 is a great gear in IMHO. I had that setup in my '78/stroker truck and loved it. Right now I'm running a 3.73 and pull about 3200RPM to do 70MPH and it is KILLING me on gas.
|
![]() |
![]() |
![]() |
Bookmarks |
|
|