What axle ration in a longhorn? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Vintage Windmills · 10-12-2011, 09:00 AM

1972 3/4 longhorn LS9 350, Eaton rear, no ratio on SPID so what would this truck have in it? Anyone know was the standard issue?

**special-K** · 10-12-2011, 10:19 AM

The standard ratio would be the same in any C/20 or K/20 with HO52/automatic transmission/SBC...4.10

**Classic Heartbeat** · 10-12-2011, 10:48 AM

special-k is correct. All Longhorhs have Dana 60 rear ends. All Dana 60s have a tag bolted to the inspection cover. The tag tells you what the ratio of your rear end is. That is unless it was removed. WES

Vintage Windmills · 10-12-2011, 11:02 AM

Thanks guys. I guess this truck must have had a rear end swap then with the HO52 Eaton in there. All bets are off then if not original to the truck.

crazy longhorn · 10-12-2011, 02:41 PM

Quote:

Originally Posted by Vintage Windmills

Thanks guys. I guess this truck must have had a rear end swap then with the HO52 Eaton in there. All bets are off then if not original to the truck.

My bet is that the diff is original, my sb powered longhorn also had an HO52 eaton(4.10 gears). I think you will find the BB powered longhorns to use the Dana 60 crazyL

**special-K** · 10-12-2011, 02:50 PM

I don't know about Longhorns very intimately. But,it is true that any C/20 with the BBC got a Dana60 to get the 3.54 ratio. At least with an automatic it did. So,that would include Longhorns.

**Classic Heartbeat** · 10-12-2011, 03:41 PM

I am probably mistaken. I haven't ever owned one, nor had customers come in with one that wasn't a big block except 1. That was a GMC and it had a Dana 60 with 4:10 gears. WES

Longhorn Man · 10-12-2011, 06:50 PM

I've had a 70 CST/20 and a 70 C/30, both 350/TH350 longhorns... Eaton HO50 and HO72 respectivly, both 4.10. Also had a 71 (maybe 72) Cheyenne/20 longhorn, 307/th350... eaton HO52 with 4.10.
You didn't list if it was a manual or auto tranny.... auto would be 4.10 maunal would be 4.57.
Big block C/20 trucks automaticly got the Dana with the 3.54 unless optioned otherwise.
No dana in one ton, 4.10 with the big block C/30
Dana rears were founs in a handfull of inlines or small blocks, but gears were basicly the same as eatons, but normally off by .01 (4.11 instead of 4.10, 4.56 instead of 4.57)
A ration is a serving of chow... these are ratios.

Vintage Windmills · 10-12-2011, 08:23 PM

Quote:

Originally Posted by Longhorn Man

I've had a 70 CST/20 and a 70 C/30, both 350/TH350 longhorns... Eaton HO50 and HO72 respectivly, both 4.10. Also had a 71 (maybe 72) Cheyenne/20 longhorn, 307/th350... eaton HO52 with 4.10.
You didn't list if it was a manual or auto tranny.... auto would be 4.10 maunal would be 4.57.
Big block C/20 trucks automaticly got the Dana with the 3.54 unless optioned otherwise.
No dana in one ton, 4.10 with the big block C/30
Dana rears were founs in a handfull of inlines or small blocks, but gears were basicly the same as eatons, but normally off by .01 (4.11 instead of 4.10, 4.56 instead of 4.57)
A ration is a serving of chow... these are ratios.

Good info. Its an auto.

I guess I was hungry when I typed the title!

Longhorn Man · 10-12-2011, 10:04 PM

LOL @ being hungry!

SS Tim · 10-12-2011, 11:20 PM

Don't know, but for what its worth, I do have pictures showing Longhorns with as follows
70 GMC 2500 350/auto Dana
71 Chevy C30 400/4spd Eaton
72 Chevy C20 350/auto Eaton
and last
71 Chevy C30 srw 350/4spd Eaton (cc being passed off as a bedless Longhorn)

Also here are clips from the '72 truck data book

**special-K** · 10-13-2011, 08:23 AM

GM rationed the same ratios in Longhorn C/20s as 127" C/20s

10-12-2011, 09:00 AM	#1
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	What axle ration in a longhorn? 1972 3/4 longhorn LS9 350, Eaton rear, no ratio on SPID so what would this truck have in it? Anyone know was the standard issue? __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

10-12-2011, 10:19 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: What axle ration in a longhorn? The standard ratio would be the same in any C/20 or K/20 with HO52/automatic transmission/SBC...4.10 __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-12-2011, 10:48 AM	#3
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,768	Re: What axle ration in a longhorn? special-k is correct. All Longhorhs have Dana 60 rear ends. All Dana 60s have a tag bolted to the inspection cover. The tag tells you what the ratio of your rear end is. That is unless it was removed. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

10-12-2011, 11:02 AM	#4
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: What axle ration in a longhorn? Thanks guys. I guess this truck must have had a rear end swap then with the HO52 Eaton in there. All bets are off then if not original to the truck. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

10-12-2011, 02:50 PM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: What axle ration in a longhorn? I don't know about Longhorns very intimately. But,it is true that any C/20 with the BBC got a Dana60 to get the 3.54 ratio. At least with an automatic it did. So,that would include Longhorns. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-12-2011, 03:41 PM	#7
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,768	Re: What axle ration in a longhorn? I am probably mistaken. I haven't ever owned one, nor had customers come in with one that wasn't a big block except 1. That was a GMC and it had a Dana 60 with 4:10 gears. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

10-12-2011, 06:50 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What axle ration in a longhorn? I've had a 70 CST/20 and a 70 C/30, both 350/TH350 longhorns... Eaton HO50 and HO72 respectivly, both 4.10. Also had a 71 (maybe 72) Cheyenne/20 longhorn, 307/th350... eaton HO52 with 4.10. You didn't list if it was a manual or auto tranny.... auto would be 4.10 maunal would be 4.57. Big block C/20 trucks automaticly got the Dana with the 3.54 unless optioned otherwise. No dana in one ton, 4.10 with the big block C/30 Dana rears were founs in a handfull of inlines or small blocks, but gears were basicly the same as eatons, but normally off by .01 (4.11 instead of 4.10, 4.56 instead of 4.57) A ration is a serving of chow... these are ratios.

10-12-2011, 10:04 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What axle ration in a longhorn? LOL @ being hungry!

10-12-2011, 11:20 PM	#11
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: What axle ration in a longhorn? Don't know, but for what its worth, I do have pictures showing Longhorns with as follows 70 GMC 2500 350/auto Dana 71 Chevy C30 400/4spd Eaton 72 Chevy C20 350/auto Eaton and last 71 Chevy C30 srw 350/4spd Eaton (cc being passed off as a bedless Longhorn) Also here are clips from the '72 truck data book Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

10-13-2011, 08:23 AM	#12
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: What axle ration in a longhorn? GM rationed the same ratios in Longhorn C/20s as 127" C/20s __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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