|
10-30-2003, 02:59 AM
|
#1 |
|
KEEP ON TRUCKING
Join Date: Sep 2000
Location: martinsville va
Posts: 2,563
|
what gear
on the 72 i got tore apart right now its a longbed will be running 402bb mildly built and not sure if im going run a th350 or a 400.it will be used some for pulling a 18ft car trailer.will be running 275/60/15 tires what gear ratio should i run i want to pull good but i dont want the rpm screaming at 70 mph.when i had the 350/350 in it it pulled real good with the 3.08.i was thinking about 3.73 or 3.42.it will see alot of highway use just looking for the best performance all way around.thanks
__________________
72 cheyenne 2wd lwb 71 k20 sons bassett va |
|
|
|
10-30-2003, 08:22 AM
|
#2 |
|
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,856
|
My 3:73's scream at around 3000 RPm on the highway with 275/60/15 on all four corners. . Not too bad in my opinion.
__________________
Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
|
|
|
|
10-30-2003, 08:39 AM
|
#3 |
|
Registered User
Join Date: May 2003
Location: Vermont
Posts: 996
|
I guess as a general rule, 3.73's are the perfect all around highway / town road / backwoods gears to have if you've got a tire size that's about standard. Personally, I've got 3.08's and 4.56's (night and day!) to choose from, and will probably go 3.08 as I do quite a bit of 50+mph driving. If I were to choose, and have a setup perfect for me, I'd go somewhere in between 3.73 and 3.08.
I haven't run the 3.08's on the interstate yet, but my goal is to be running around 2500-3000rpm at 80+ mph, whatever setup that gives me. |
|
|
|
|
10-30-2003, 10:03 AM
|
#4 |
|
Registered User
 Join Date: Feb 2000
Location: Georgetown, KY, USA
Posts: 631
|
I would go with the 3.42 gears. The 3.73's are nice for towing, but 70 mph really turns the RPM plus how fast are you really going to drive it with out a trailer? 75-80? The 3.42 is a good gear , slightly better for highway milage, yet still low enough to pull decent, especially running a BB402. Just my 2 cents....
|
|
|
|
|
10-30-2003, 10:16 AM
|
#5 |
|
Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,261
|
I would run the 342 with a posi. Best of all worlds especially if you find a nice overdrive trans. It will give you the low end and the high end with lot of potential inbetween.
|
|
|
|
|
10-30-2003, 10:19 AM
|
#6 |
|
Keepin an eye out
Join Date: Feb 2003
Location: So.Cal
Posts: 3,920
|
Another vote for 3.42, thats what I just put in my truck.
__________________
1970 Chevy C10 SWB 5.3 1996 Toyota Tacoma SR5 4x4 2007 Vespa GTS 250 Scooter ZIP 91351 |
|
|
|
|
10-30-2003, 10:25 AM
|
#7 |
|
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
|
I would also go 3.42, your BB will have plenty of tork & the 3.42s will show you about 72mph @ 3000 rpms on the 275/60 /15 tires. Good luck,crazyL
__________________
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.... |
|
|
|
|
10-30-2003, 10:31 AM
|
#8 |
|
Senior Moment
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,193
|
3:50 F@rd 9" Posi "The only way to FLY"
__________________
1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
|
|
|
|
10-30-2003, 10:41 AM
|
#9 |
|
Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
|
3.42 gets my vote too....that big block would still have enought toruqe for 3.08's to work good, but with a car trailer, 3.42's would be the way to go
__________________
'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
|
|
|
|
10-30-2003, 12:06 PM
|
#10 |
|
KEEP ON TRUCKING
Join Date: Sep 2000
Location: martinsville va
Posts: 2,563
|
thanks i believe i will go 3.42
70cst ive been waiting for the truck to bring me that 9in  woody i dont drive fast much but i was clocked a couple years ago at 104 in a 70 in nc with trailer/drag car.we woke up late and its a 2hr drive to track had to get there
__________________
72 cheyenne 2wd lwb 71 k20 sons bassett va |
|
|
|
|
10-31-2003, 12:06 PM
|
#11 | |
|
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
|
Quote:
|
|
|
|
|
|
10-31-2003, 03:50 PM
|
#12 |
|
KEEP ON TRUCKING
Join Date: Sep 2000
Location: martinsville va
Posts: 2,563
|
had to get there hehe i wouldnt normally do that but the trailer is my cousins homemade i guess he got lucky and got the weight balanced right and my lwb with those hd leafs.it rides like a caddy loaded but will beat you to death when not i forget the trailer is there sometimes
__________________
72 cheyenne 2wd lwb 71 k20 sons bassett va |
|
|
|
|
10-31-2003, 06:23 PM
|
#13 | |
|
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
|
Quote:
crazyL
__________________
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.... |
|
|
|
|
|
10-31-2003, 06:44 PM
|
#14 |
|
State of Confusion!
 
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,251
|
Not from our years, but My 96 has 3:42 and it pulls real strong (Vortec 350)...too much sometimes. Course mine has the OD...but when I had the 275/60 15 on it I would be doing about 2100 at 75. I had trouble that if it was even the slightest bit wet on the road, the rear would break loose unless you was a super old fart off the line.
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
|
|
|
|
10-31-2003, 06:49 PM
|
#15 |
|
Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
|
th400 is one tough trans
|
|
|
|
|
10-31-2003, 06:55 PM
|
#16 |
|
Registered User
Join Date: Jan 2003
Location: Seattle WA
Posts: 1,466
|
Well I guess I am the odd guy out.....if you are building a big block with torque, I would say 3.08's are fine...the speed limits here are 60 and 70...I drive 10 over....at 60 my 502 is turning 2500....at 80 closer to 3200...thats gas guzzling RPM for any big block.
Comparitively speeking my Suburban with an OD and a 496 isn't far off....but it has 4.10's ...again with an OD.
__________________
FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection |
|
|
|
 |
| Bookmarks |
| Thread Tools | |
| Display Modes | |
|
|
Linear Mode
