yet another rear gear question...longhorn. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mtdave2 · 09-04-2009, 02:15 PM

i have always asumed that i had a 3.73 rear end. i followed the instrutions found in this post. about turning the tire and counting how many times the driveline turns...

http://67-72chevytrucks.com/vboard/s...ight=rear+gear

my results say its a 4.11. it could be right i guess, but this truck has never be able to spin the tires much, and its a bit of a dog off the start. the power of the motor should be enough.. on the high way i run 70mph at 3000 rpm. 16 inch rims. Tire size 235/85/r16.

does this sound like a 411 to you? btw its an open axel.

rwolf9653 · 09-04-2009, 02:21 PM

What trans??

It is possible to have 4:11, but more likely that you have 3:73's.

Sinister · 09-04-2009, 02:33 PM

I have 4.11 gears and turn 3000 rpm at 70 mph. Tires are 265/70R16. Is your Longhorn a 3/4 ton?

mtdave2 · 09-04-2009, 02:55 PM

ya 72 c20, th350. 350 motor

Longhorn Man · 09-04-2009, 04:16 PM

dave, with as original as your truck was when you got it, it is very safe to say the rear has never been opened.
With that being said, 4.10 was the tallest gear you could ever get stock. 4.10, 4.57, and 5.13 (I think the last one was only on trucks with the dual rear wheel option)
Being a small block and auto, the 4.10 was the standard gearset, so since nothing was optioned otherwise, the truck was all original when you got it, and the spin the wheel test agreed with it all.... you have a 4.10 gear.

mtdave2 · 09-07-2009, 12:00 PM

i wonder why is not better off the line? perhaps im just picky lol.

Skirkpat · 09-07-2009, 02:53 PM

Quote:

Originally Posted by mtdave2

i wonder why is not better off the line? perhaps im just picky lol.

I would not blame the rear end for the lack of acceleration, pop the hood and start placing blame there, Remember these are HEAVY, and a stock small block is not a powerhouse by any stretch of the imagination.

**Boog** · 09-07-2009, 03:14 PM

Be a good time to look into the condition of the engine. Compression test and tuneup maybe. Look at the advance mechanism in the distributor. It could be the mech advance is siezed up and that will make it sluggish and thirsty. Also the vacumn advance may be bad. Or it may only need some new plugs, wires and cap.

mtdave2 · 09-07-2009, 03:46 PM

http://67-72chevytrucks.com/vboard/s...ighlight=heads

motor is fine, i think its just heavy..lol

09-04-2009, 02:15 PM	#1
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	yet another rear gear question...longhorn. i have always asumed that i had a 3.73 rear end. i followed the instrutions found in this post. about turning the tire and counting how many times the driveline turns... http://67-72chevytrucks.com/vboard/s...ight=rear+gear my results say its a 4.11. it could be right i guess, but this truck has never be able to spin the tires much, and its a bit of a dog off the start. the power of the motor should be enough.. on the high way i run 70mph at 3000 rpm. 16 inch rims. Tire size 235/85/r16. does this sound like a 411 to you? btw its an open axel. __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

09-04-2009, 02:21 PM	#2
rwolf9653 more ideas than money Join Date: Dec 2008 Location: spring grove, pa Posts: 1,068	Re: yet another rear gear question...longhorn. What trans?? It is possible to have 4:11, but more likely that you have 3:73's. __________________ Randy 1948 Chevy 3100 5 window 1966 Chevy C30 Dually 1967 Chevy K10 1972 Chevy K20 1972 Chevy C10 1972 Chevy K5 Blazer 1987 Chevy V10 2003 Chevy Suburban

09-04-2009, 02:33 PM	#3
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: yet another rear gear question...longhorn. I have 4.11 gears and turn 3000 rpm at 70 mph. Tires are 265/70R16. Is your Longhorn a 3/4 ton? __________________ Beat it to fit, Paint it to match...

09-04-2009, 02:55 PM	#4
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	Re: yet another rear gear question...longhorn. ya 72 c20, th350. 350 motor __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

09-04-2009, 04:16 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: yet another rear gear question...longhorn. dave, with as original as your truck was when you got it, it is very safe to say the rear has never been opened. With that being said, 4.10 was the tallest gear you could ever get stock. 4.10, 4.57, and 5.13 (I think the last one was only on trucks with the dual rear wheel option) Being a small block and auto, the 4.10 was the standard gearset, so since nothing was optioned otherwise, the truck was all original when you got it, and the spin the wheel test agreed with it all.... you have a 4.10 gear.

09-07-2009, 12:00 PM	#6
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	Re: yet another rear gear question...longhorn. i wonder why is not better off the line? perhaps im just picky lol. __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

09-07-2009, 03:14 PM	#8
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,113	Re: yet another rear gear question...longhorn. Be a good time to look into the condition of the engine. Compression test and tuneup maybe. Look at the advance mechanism in the distributor. It could be the mech advance is siezed up and that will make it sluggish and thirsty. Also the vacumn advance may be bad. Or it may only need some new plugs, wires and cap. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

09-07-2009, 03:46 PM	#9
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	Re: yet another rear gear question...longhorn. http://67-72chevytrucks.com/vboard/s...ighlight=heads motor is fine, i think its just heavy..lol __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban



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