Yikes 5.13 ratio - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bob Moore · 08-09-2005, 08:46 PM

I am looking at a 67 3/4T Customer Camper CST with 327/auto. Listed on the glove box is a 5.13 limited slip rear. I did not look at the automatic option on the glove box but it is a T-400(rebuilt because it is clean) with electric kickdown switch and not a cable like a T-350.

I have 2 questions:

1. Did GM use a T-400 in 67?

2. What about that 5.13 ratio? How bad will my RPMs be with an auto and a 5.13?

I think this is original because the original owner ordered this to haul a camper and it is now for sale by his brother. All the 67 deluxe knobs are there along with a manual choke, 67 lighter, 67 am radio, chrome wing windows, glove box light and CST horn cap. Also shown on the glove box was the RPO A10 - Panoramic Cab. The dash has not been cut nor have the doors. The bed is a wood floor(rotted away) front sheet metal is very good along with the doors. I did notice a rust hole thru the floor down by drivers feet.

Any idea on value with out pictures?

Thanks - Bob

Longhorn Man · 08-09-2005, 09:06 PM

The TH400 was the ONLY 3 speed auto in 67, the TH350 didn't come into play untill 69.
The 5.13's will suck. No way around it. If it is an Eaton/corperate rear, then a gear chainge will be simple, and a 4.10 should be pretty easy to locate. THe panoramic cab option is a big back window.

Value????
50 bucks on up to $3500.

LUV2XCLR8 · 08-09-2005, 09:08 PM

Quote:

Originally Posted by Longhorn Man

The TH400 was the ONLY 3 speed auto in 67, the TH350 didn't come into play untill 69.
The 5.13's will suck. No way around it. If it is an Eaton/corperate rear, then a gear chainge will be simple, and a 4.10 should be pretty easy to locate. THe panoramic cab option is a big back window.

Value????
50 bucks on up to $3500.

Bob Moore · 08-09-2005, 09:59 PM

Thanks for the info on the T-400 availability. I know without pics the value is hard to determine but I was hoping to get a small range than $3450.

Seriously guys - Thanks - Bob

67_C-30 · 08-10-2005, 12:14 AM

I have the 5.13's in my '67 C-30 and the valves float out about 62 MPH...MAY get 65 Downhill with a tail wind!! The upside is if you ever need to move your house over a few feet, I'm sure it would do it!!

4x4Poet · 08-10-2005, 05:25 AM

OTOH, if you plan on using fairly tall tires, the 5.13 ratio can make a SBC a stump puller and the truck a great tow vehicle, but no freeway competitor. If it has an Eaton rear axle, I'd guess that the limited slip is a detroit locker.

Both an Eaton Detroit Locker and Eaton 5.13 gear carriers are of value to the 4x4 Eaton users that want low gears for huge tires. I'd guess that you could sell the Eaton 3rd with Detroit for over $400. Eaton Detroit only for ~300. Eaton 5.13 3rd with open diff (from another Eaton 3rd while you kept the Detroit) ~200.

You could keep the Detroit and swap it into another Eaton 3rd, say with 4.11 gears. Source an Eaton open diff carrier cheap and sell the 5.13 gears assembled with the open diff for a profit. I've heard many folks have sourced used, complete Eaton 4.11 3rds with open diffs for <$100. Sometimes $50. Or just swap in a complete Eaton w/higher gears & open diff and sell the Eaton Detroit 5.13 3rd complete. Options, options.

Pacemaster · 08-10-2005, 11:13 AM

Hello all-new here. I own a 67 lwb custom camper. 3/4 ton ? Eaton 3rd member---
glove box sticker does not mention anything about gear ratio. I have stock size 16" tires 8 lug rims. She revs around 3000rpm at 60 mph= 4:11 gearing ?
Who has ring and pinion gears for this axel-- 10 bolt cover with drop out carrier-- is there a model number for this axel. Thanks

**JIMs70GMC** · 08-10-2005, 11:57 AM

pacemaster, it's refered to by it's RPO number H052 (3/4ton) or H072 for the 1 tons. Ring/pinions only available used, 4.11, 4.57 and 5.13.

Fred T · 08-10-2005, 12:31 PM

I would guess the value is more in the $1,000-1,500 range. If there is a rust hole through the floor, there will be a lot more very soon. The rotted bed, gears and 3/4 ton don't help the value either. Usually, the owners of these trucks think they have a gold mine on their hands. It usually becomes a matter of finding a sucker.

On the gears, with 30" tires, you will be turning about 3,500 rpm at 60. Sounds like Pacemaker has 4.57, I would look for 4.10, which is about the best you can find for an Eaton for a pre-73. You could also swap for a full-floater 14 bolt with 3.73.

**CPNE** · 08-10-2005, 12:55 PM

Fred since when did you become the "Resident Curmudgeon"? Guess there's room for 2, Lord knows this board needs a kick in the a$$ from time to time.

FYI, the fact that it's a 3/4 ton with 5:13 gears is the reason to buy it. It's GVW and towing capacity that give a real truck value, poser's be damned

Robert1970C20rstbukt · 08-10-2005, 01:27 PM

I'd buy it and leave the 5.13's in it, just throw some 33s or 35s on the rear to help with RPMs.

Bob Moore · 08-10-2005, 01:42 PM

Again - THANKS to all you guys. This a great place for the exchange of ideas , thoughts and opinions. I truly value everybodies post.

The owner is asking $1200 - says to me only $1000(barely knows me). I, of course, want to pay less. Guess it is time to fish or cut bait.

Any other ideas, keep 'em coming.

Thanks again - Bob

Americanrider · 08-10-2005, 02:20 PM

I have a open 4.10 HO52 minus hubs sitting in my yard. It might need a overhaul, but I'll sell it for $50. I'm sure that somebody would love that rear for a dumptruck. Offer up 900 and see if he bites.

Longhorn Man · 08-10-2005, 07:38 PM

pacemaster, we need more info on your truck's original combo. What engine and tranny did it have when new?

Robert1970C20rstbukt · 08-10-2005, 10:42 PM

The model number should be stamped in the axle tube on the right? side, either on top or on the bottom, not sure though.

Pacemaster · 08-14-2005, 02:53 PM

Thanks Longhorn Man - here is whats listed on the glovebox door.
327/ th400/ps/pb/front stabilizer/HD rear springs/16" rims/ 8 lug/camper name plate
3,300 rpms @ 60 sux. Engine is now a 350/ Edlebrock intake/ small tube headers/ Quadrajet/ HEI/ maybe has 5:13 gears ? Thanks again for any info.

Pacemaster · 08-14-2005, 02:57 PM

May go with some huge rear tires--- for now-My Bro has a couple of those rims 16'5 ?

Longhorn Man · 08-14-2005, 03:50 PM

pacemaster, you guessed right on the money, 4.10 gears is what you should have if original. Small block with automatic automaticly got that onless otherwise optioned.

Pacemaster · 08-14-2005, 05:51 PM

WOW--4.10,s ? can't imagine driving with 5:13's...Move a House was funny. Thanks guy's. I have had some fun with this truck lately....with an open diff it just fries the right rear tire--then blammo 2nd gear huge screech--while pulling out and turning right.
I forgot to mention it has a performance cam too. Great web site.

Ps -driving at 5000' elevation.

Pacemaster · 08-14-2005, 06:05 PM

Hey Longhorn---just visited your web site----fugly crash---glad no injuries.. ouch.

08-09-2005, 08:46 PM	#1
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	Yikes 5.13 ratio I am looking at a 67 3/4T Customer Camper CST with 327/auto. Listed on the glove box is a 5.13 limited slip rear. I did not look at the automatic option on the glove box but it is a T-400(rebuilt because it is clean) with electric kickdown switch and not a cable like a T-350. I have 2 questions: 1. Did GM use a T-400 in 67? 2. What about that 5.13 ratio? How bad will my RPMs be with an auto and a 5.13? I think this is original because the original owner ordered this to haul a camper and it is now for sale by his brother. All the 67 deluxe knobs are there along with a manual choke, 67 lighter, 67 am radio, chrome wing windows, glove box light and CST horn cap. Also shown on the glove box was the RPO A10 - Panoramic Cab. The dash has not been cut nor have the doors. The bed is a wood floor(rotted away) front sheet metal is very good along with the doors. I did notice a rust hole thru the floor down by drivers feet. Any idea on value with out pictures? Thanks - Bob __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

08-09-2005, 09:59 PM	#4
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	Thanks for the info on the T-400 availability. I know without pics the value is hard to determine but I was hoping to get a small range than $3450. Seriously guys - Thanks - Bob __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

08-10-2005, 12:14 AM	#5
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	I have the 5.13's in my '67 C-30 and the valves float out about 62 MPH...MAY get 65 Downhill with a tail wind!! The upside is if you ever need to move your house over a few feet, I'm sure it would do it!! __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club!

08-10-2005, 05:25 AM	#6
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	OTOH, if you plan on using fairly tall tires, the 5.13 ratio can make a SBC a stump puller and the truck a great tow vehicle, but no freeway competitor. If it has an Eaton rear axle, I'd guess that the limited slip is a detroit locker. Both an Eaton Detroit Locker and Eaton 5.13 gear carriers are of value to the 4x4 Eaton users that want low gears for huge tires. I'd guess that you could sell the Eaton 3rd with Detroit for over $400. Eaton Detroit only for ~300. Eaton 5.13 3rd with open diff (from another Eaton 3rd while you kept the Detroit) ~200. You could keep the Detroit and swap it into another Eaton 3rd, say with 4.11 gears. Source an Eaton open diff carrier cheap and sell the 5.13 gears assembled with the open diff for a profit. I've heard many folks have sourced used, complete Eaton 4.11 3rds with open diffs for <$100. Sometimes $50. Or just swap in a complete Eaton w/higher gears & open diff and sell the Eaton Detroit 5.13 3rd complete. Options, options. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. Last edited by 4x4Poet; 08-10-2005 at 05:27 AM.

08-10-2005, 11:57 AM	#8
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	pacemaster, it's refered to by it's RPO number H052 (3/4ton) or H072 for the 1 tons. Ring/pinions only available used, 4.11, 4.57 and 5.13. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-09-2005, 09:06 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	The TH400 was the ONLY 3 speed auto in 67, the TH350 didn't come into play untill 69. The 5.13's will suck. No way around it. If it is an Eaton/corperate rear, then a gear chainge will be simple, and a 4.10 should be pretty easy to locate. THe panoramic cab option is a big back window. Value???? 50 bucks on up to $3500.

08-10-2005, 11:13 AM	#7
Pacemaster Registered User Join Date: Jul 2005 Location: Carson City, Nevada Posts: 8	Hello all-new here. I own a 67 lwb custom camper. 3/4 ton ? Eaton 3rd member--- glove box sticker does not mention anything about gear ratio. I have stock size 16" tires 8 lug rims. She revs around 3000rpm at 60 mph= 4:11 gearing ? Who has ring and pinion gears for this axel-- 10 bolt cover with drop out carrier-- is there a model number for this axel. Thanks

08-10-2005, 12:31 PM	#9
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	I would guess the value is more in the $1,000-1,500 range. If there is a rust hole through the floor, there will be a lot more very soon. The rotted bed, gears and 3/4 ton don't help the value either. Usually, the owners of these trucks think they have a gold mine on their hands. It usually becomes a matter of finding a sucker. On the gears, with 30" tires, you will be turning about 3,500 rpm at 60. Sounds like Pacemaker has 4.57, I would look for 4.10, which is about the best you can find for an Eaton for a pre-73. You could also swap for a full-floater 14 bolt with 3.73. __________________ Fred There is no such thing as too much cam...just not enough engine.

08-10-2005, 12:55 PM	#10
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Fred since when did you become the "Resident Curmudgeon"? Guess there's room for 2, Lord knows this board needs a kick in the a$$ from time to time. FYI, the fact that it's a 3/4 ton with 5:13 gears is the reason to buy it. It's GVW and towing capacity that give a real truck value, poser's be damned __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

08-10-2005, 01:27 PM	#11
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	I'd buy it and leave the 5.13's in it, just throw some 33s or 35s on the rear to help with RPMs. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

08-10-2005, 01:42 PM	#12
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	Again - THANKS to all you guys. This a great place for the exchange of ideas , thoughts and opinions. I truly value everybodies post. The owner is asking $1200 - says to me only $1000(barely knows me). I, of course, want to pay less. Guess it is time to fish or cut bait. Any other ideas, keep 'em coming. Thanks again - Bob __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

08-10-2005, 02:20 PM	#13
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	I have a open 4.10 HO52 minus hubs sitting in my yard. It might need a overhaul, but I'll sell it for $50. I'm sure that somebody would love that rear for a dumptruck. Offer up 900 and see if he bites.

08-10-2005, 07:38 PM	#14
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	pacemaster, we need more info on your truck's original combo. What engine and tranny did it have when new?

08-10-2005, 10:42 PM	#15
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	The model number should be stamped in the axle tube on the right? side, either on top or on the bottom, not sure though. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

08-14-2005, 02:53 PM	#16
Pacemaster Registered User Join Date: Jul 2005 Location: Carson City, Nevada Posts: 8	Thanks Longhorn Man - here is whats listed on the glovebox door. 327/ th400/ps/pb/front stabilizer/HD rear springs/16" rims/ 8 lug/camper name plate 3,300 rpms @ 60 sux. Engine is now a 350/ Edlebrock intake/ small tube headers/ Quadrajet/ HEI/ maybe has 5:13 gears ? Thanks again for any info.



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08-14-2005, 02:57 PM	#17
Pacemaster Registered User Join Date: Jul 2005 Location: Carson City, Nevada Posts: 8	May go with some huge rear tires--- for now-My Bro has a couple of those rims 16'5 ?

08-14-2005, 03:50 PM	#18
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	pacemaster, you guessed right on the money, 4.10 gears is what you should have if original. Small block with automatic automaticly got that onless otherwise optioned.

08-14-2005, 05:51 PM	#19
Pacemaster Registered User Join Date: Jul 2005 Location: Carson City, Nevada Posts: 8	Hot rod 67 WOW--4.10,s ? can't imagine driving with 5:13's...Move a House was funny. Thanks guy's. I have had some fun with this truck lately....with an open diff it just fries the right rear tire--then blammo 2nd gear huge screech--while pulling out and turning right. I forgot to mention it has a performance cam too. Great web site. Ps -driving at 5000' elevation.

08-14-2005, 06:05 PM	#20
Pacemaster Registered User Join Date: Jul 2005 Location: Carson City, Nevada Posts: 8	Hey Longhorn---just visited your web site----fugly crash---glad no injuries.. ouch.

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