check this out - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ol71c-10 · 09-04-2003, 10:07 PM

i got a 71 c-10 ,396..t350...finally got rid of the 4.11 and got me a 3.08 rear end ,but now how do i callibrate the speedometer?do i gotta get one of those compensation thingys?where the hell do i find those at?...p.s.....im new to the board...glad i found it.ive been hangin out in the stovebolt page....so i feel like im in heaven now.....

....gotta love them c-10's

krue · 09-04-2003, 11:29 PM

Welcome to the board from South Mississippi!

They make gears to match your speedo to your rear ratio, and I am sure someone will tell you were to get em!

MOTHERTRUCKERS · 09-05-2003, 08:16 AM

Your local Chevrolet dealer should have them.

JimKshortstep4x4 · 09-05-2003, 08:18 AM

Welcome from West Michigan!

Jim

*Gee_Emm* · 09-05-2003, 09:27 AM

http://www.tciauto.com/tech_info/speedo_gears.htm
http://www.sccoa.com/faq/speedgr.html
http://members.core.com/~faldrich/speedo.htm

ol71c-10 · 09-05-2003, 10:51 AM

cool...thanx for the help on this issue

Longhorn Man · 09-06-2003, 11:40 PM

Welcome to the board. Them 3.07 gears are awsome when you're in a hurry huh?

Bob Chayer · 09-07-2003, 08:10 AM

Any idea where we can get new speedo gears for 205 transfer cases for us 4WD types?

Longhorn Man · 09-08-2003, 12:20 AM

Bob, you tried the dealer?

Bob Chayer · 09-08-2003, 08:14 AM

Not yet but I think I will stop by today if one of the older guys is working. The newbies have problems locating the good stuff for our trucks! Thanks!

**Palf70Step** · 09-08-2003, 08:36 AM

Anothe Mississippi welcome to you.
Like the others mentioned, I have always had my best luck withspeedo adjustments using the dealers to find the right gear combo.

hgs_notes · 09-08-2003, 09:50 AM

Quote:

Them 3.07 gears are awsome when you're in a hurry huh?

Longhornman, that is pretty cool, but did you have to put your newspaper down to take the picture or just set beer can back in your lap, LOL.

HG

ol71c-10 · 09-08-2003, 05:46 PM

lol.....90?easy now!!!lol....thanx for the info on the dealers thing....and i like how ya painted out ya dials whit...pretty trick idea

cojnit · 09-08-2003, 06:08 PM

surely stuff would fall off, break or both. also woould be so loud from road noise, I would be seeing things blurry!

71-longbed · 09-08-2003, 06:51 PM

i wish i had a tach ...so i could tell if i really have 3.08's ...im not sure right now

PanelDeland · 09-08-2003, 07:54 PM

Hey 71, I don't have a tach either but I do have an engine analyzer(tach/dwell meter).I put it on the dash and ran the cords thru the vent window and under the hood.After hooking the wires up the only thing left to do was take a ride.I now know that I have 3.07 rear gears.Took all of 15 min since I had to get gas to drive the truck.

ol71c-10 · 09-08-2003, 08:39 PM

or better yet...jack the ol truck up...mark the drive shaft with a marker....mark the tire...make one full turn of the tire and count how many times the drive shaft turns....not exact...but it will give ya a general idea.....3 turns...3.08 or 3.07,.....31\2 turns....3.55...and so on

**BIG ORANGE** · 09-08-2003, 08:56 PM

Welcome from upper South Carolina!!!!!!!!!!
Let me know if I can be of help!!!!!!!!!!

Longhorn Man · 09-08-2003, 10:59 PM

She spins a nice low RPM on the open road, but I would rather have a few more revs in all reality. This truck gets better MPG at 80-ish than it does at 55. (I've documented it many times) and plus the off the line performance pretty much sucks. I have to work it pretty hard to get the right rear to turn, even with the big ass cam in it.

ol71c-10 · 09-09-2003, 08:06 PM

thanx big orange...nice to see someone from sc....

crazy longhorn · 09-09-2003, 08:31 PM

Quote:

Originally posted by Longhorn Man
Welcome to the board. Them 3.07 gears are awsome when you're in a hurry huh?

Cool pic Andy! You gotta love those hyway cruisers........4000 on the tack in 6th puts the speedo needle straight down on the old longhorn.......not bad for 4.10s on a 28" tire I guess?(dont think I will try to snap the pic tho)

crazyL

Tx Firefighter · 09-09-2003, 09:54 PM

Quote:

Originally posted by ol71c-10
or better yet...jack the ol truck up...mark the drive shaft with a marker....mark the tire...make one full turn of the tire and count how many times the drive shaft turns....not exact...but it will give ya a general idea.....3 turns...3.08 or 3.07,.....31\2 turns....3.55...and so on

If you have a posi yes.

On an open rear, you turn the wheel 2 turns and count the driveshaft revs.

Try it if you're skeptical.

Longhorn Man · 09-09-2003, 11:10 PM

Crazy longhorn....cummon...live a little! You can take a pic with one hand can't you?

crazy longhorn · 09-09-2003, 11:22 PM

As I get older, some of my "crazy" wears off

It looks like we run about the same rpms. Final ratio on the longhorn is around 3.11 (4.10 x .76) in 6th gear......it sure makes a big diff cruising down the hyway! 4.10s/ 400T/loose converter ran 4000 @ 78 mph......it didnt take too many miles to break in the last engine

crazyL

Longhorn Man · 09-09-2003, 11:29 PM

LOL, I know what you're saying. I stay away from teh freeways these days so i am not tempted to do 90+ (which is the flow 1/2 the damn time). I take all the 2 lane black tops to work these days.
Man, does that mean I'm growing up? Growing old? I don't like the sounds of this...and to boot, my wife found white in my bierd and chest.

09-04-2003, 10:07 PM	#1
ol71c-10 Registered User Join Date: Sep 2003 Location: greenville,south carolina Posts: 49	check this out i got a 71 c-10 ,396..t350...finally got rid of the 4.11 and got me a 3.08 rear end ,but now how do i callibrate the speedometer?do i gotta get one of those compensation thingys?where the hell do i find those at?...p.s.....im new to the board...glad i found it.ive been hangin out in the stovebolt page....so i feel like im in heaven now..... ....gotta love them c-10's

09-04-2003, 11:29 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Welcome to the board from South Mississippi! They make gears to match your speedo to your rear ratio, and I am sure someone will tell you were to get em! __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

09-05-2003, 08:16 AM	#3
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	Your local Chevrolet dealer should have them. __________________ Rest in Peace Ed. Thanks for all the good times.

09-07-2003, 08:10 AM	#8
Bob Chayer Registered User Join Date: Dec 2002 Location: Mid, NH Posts: 150	Any idea where we can get new speedo gears for 205 transfer cases for us 4WD types? __________________ Bob Chayer 71 3/4 ton 4X4 Suburban

09-08-2003, 08:14 AM	#10
Bob Chayer Registered User Join Date: Dec 2002 Location: Mid, NH Posts: 150	Not yet but I think I will stop by today if one of the older guys is working. The newbies have problems locating the good stuff for our trucks! Thanks! __________________ Bob Chayer 71 3/4 ton 4X4 Suburban

09-05-2003, 08:18 AM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Welcome from West Michigan! Jim

09-05-2003, 09:27 AM	#5
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 4,002	http://www.tciauto.com/tech_info/speedo_gears.htm http://www.sccoa.com/faq/speedgr.html http://members.core.com/~faldrich/speedo.htm

09-05-2003, 10:51 AM	#6
ol71c-10 Registered User Join Date: Sep 2003 Location: greenville,south carolina Posts: 49	cool...thanx for the help on this issue

09-06-2003, 11:40 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Welcome to the board. Them 3.07 gears are awsome when you're in a hurry huh?

09-08-2003, 12:20 AM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Bob, you tried the dealer?

09-08-2003, 08:36 AM	#11
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,083	Anothe Mississippi welcome to you. Like the others mentioned, I have always had my best luck withspeedo adjustments using the dealers to find the right gear combo. __________________ 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!

09-08-2003, 05:46 PM	#13
ol71c-10 Registered User Join Date: Sep 2003 Location: greenville,south carolina Posts: 49	lol.....90?easy now!!!lol....thanx for the info on the dealers thing....and i like how ya painted out ya dials whit...pretty trick idea

09-08-2003, 06:08 PM	#14
cojnit Nothing clever Join Date: Jun 2003 Location: Kailua HI Posts: 828	if I tried 90 surely stuff would fall off, break or both. also woould be so loud from road noise, I would be seeing things blurry! __________________ Got "the Midas Touch!"

09-08-2003, 06:51 PM	#15
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	i wish i had a tach ...so i could tell if i really have 3.08's ...im not sure right now __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

09-08-2003, 07:54 PM	#16
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Hey 71, I don't have a tach either but I do have an engine analyzer(tach/dwell meter).I put it on the dash and ran the cords thru the vent window and under the hood.After hooking the wires up the only thing left to do was take a ride.I now know that I have 3.07 rear gears.Took all of 15 min since I had to get gas to drive the truck. __________________ 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"



Register or Log In To remove these advertisements.

09-08-2003, 08:39 PM	#17
ol71c-10 Registered User Join Date: Sep 2003 Location: greenville,south carolina Posts: 49	or better yet...jack the ol truck up...mark the drive shaft with a marker....mark the tire...make one full turn of the tire and count how many times the drive shaft turns....not exact...but it will give ya a general idea.....3 turns...3.08 or 3.07,.....31\2 turns....3.55...and so on

09-08-2003, 08:56 PM	#18
BIG ORANGE Senior Member Join Date: Oct 2001 Location: Lancaster S.C. Posts: 4,754	Welcome from upper South Carolina!!!!!!!!!! Let me know if I can be of help!!!!!!!!!! __________________ Things happen for a reason!

09-08-2003, 10:59 PM	#19
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	She spins a nice low RPM on the open road, but I would rather have a few more revs in all reality. This truck gets better MPG at 80-ish than it does at 55. (I've documented it many times) and plus the off the line performance pretty much sucks. I have to work it pretty hard to get the right rear to turn, even with the big ass cam in it.

09-09-2003, 08:06 PM	#20
ol71c-10 Registered User Join Date: Sep 2003 Location: greenville,south carolina Posts: 49	thanx big orange...nice to see someone from sc....

09-09-2003, 11:10 PM	#23
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Crazy longhorn....cummon...live a little! You can take a pic with one hand can't you?

09-09-2003, 11:22 PM	#24
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	As I get older, some of my "crazy" wears off It looks like we run about the same rpms. Final ratio on the longhorn is around 3.11 (4.10 x .76) in 6th gear......it sure makes a big diff cruising down the hyway! 4.10s/ 400T/loose converter ran 4000 @ 78 mph......it didnt take too many miles to break in the last engine 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....

09-09-2003, 11:29 PM	#25
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	LOL, I know what you're saying. I stay away from teh freeways these days so i am not tempted to do 90+ (which is the flow 1/2 the damn time). I take all the 2 lane black tops to work these days. Man, does that mean I'm growing up? Growing old? I don't like the sounds of this...and to boot, my wife found white in my bierd and chest.

Register or Log In To remove these advertisements.