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#1 |
Registered User
Join Date: Aug 2007
Location: charlestown maryland
Posts: 272
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are factory auto truck rears geared better or worse for highway
Wanted to know if I should snag the rear out of an automatic parts truck to get better highway gears in my stick truck or would it be worse? She use to tach up pretty high on the interstate
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#2 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,964
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Re: are factory auto truck rears geared better or worse for highway
that's a good question - to the best of my knowledge, 3.08 and 3.73 were what was available, but I always forget what was standard and what was the option. But I do believe both were available in auto/manual trans trucks - so the bottom line is it really doesn't matter what trans is in the truck/car that you're considering nabbing the rearend from, what matters is strictly the actual rear end ratio in the vehicle you're considering grabbing the rearend from. If your manual tach'ed up, am guessing you had a 3.73, or perhaps a 4.11 (was that an option also or am I mixing it up with the AD trucks!?).
Last edited by jocko; 10-10-2011 at 01:56 AM. |
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#3 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: are factory auto truck rears geared better or worse for highway
My '66 Suburban was an original 283, powerglide burb, and the rear had 3.73 gears.
I agree with jocko. first you need to know what gears you have now, and then pull some covers to find the gears you want.
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#4 |
Registered User
![]() Join Date: Aug 2010
Location: Burbank CA
Posts: 3,055
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Re: are factory auto truck rears geared better or worse for highway
I believe the 3.73 was given to all trucks where none was specified.
Last edited by oem4me; 10-10-2011 at 02:43 PM. |
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#5 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,964
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Re: are factory auto truck rears geared better or worse for highway
that rings a bell in my brain housing group oem4me - thanks, I believe that is correct - the "option" was the 3.08.
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#6 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,217
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Re: are factory auto truck rears geared better or worse for highway
Generally the auto trans rear ends were geared higher & are better for the high. Like the guys say you have to find out what you have & what the donor is & go from there.
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#7 |
Registered User
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 863
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Re: are factory auto truck rears geared better or worse for highway
Does this apply to 3/4 ton or 1/2 ton? I have a '62 3/4 that came with 283/ powerglide. Curious to what it has in the rear also!
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#8 |
Registered User
Join Date: Feb 2010
Location: Phoenix, AZ
Posts: 114
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Re: are factory auto truck rears geared better or worse for highway
my experience with original rear ends is they top out around 55 on the freeway with todays speed limits. back in 66 the limits was much lower so the ratio matched the speed.
this page might be of use to find out what you want based on tire size after you find out what you currently have. |
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#9 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: are factory auto truck rears geared better or worse for highway
I'm thinking the GMC would likely have a Dana 60 rather than the Eaton HO52, so it's hard to say. You might be lucky and have the 3.54 gears. If you do have the Eaton HO52 you will have either 4.11's or 4.57's.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#10 | |
Registered User
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 863
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Re: are factory auto truck rears geared better or worse for highway
Quote:
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#11 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: are factory auto truck rears geared better or worse for highway
Ooopps, I just looked at your sig and saw the GMC.
I don't have a pic handy, but the Eaton HO52 has a perfectly round rear cover with a fill plug. It also has the drop out 3rd member on the front side.
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#12 | |
Registered User
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 863
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Re: are factory auto truck rears geared better or worse for highway
Quote:
Also, didn't mean to hijack thread.... |
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#13 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: are factory auto truck rears geared better or worse for highway
Yep, that is a Eaton HO52. If you're lucky it will have the 4.11 gears. If not it will have 4.57 gears.
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#14 |
Registered User
![]() Join Date: Jan 2011
Location: Newhall Ca.
Posts: 463
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Re: are factory auto truck rears geared better or worse for highway
My 61 3/4 ton with a Hydra-Matic has 410's but that was ordered that way. I really need to get something like 323's or something for better highway driving
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1961 GMC. Start date 1/20/2011 Past projects: 1958 Fleetliner 14ft Runabout 1966 Caprice 2dr 1970 VW Squareback |
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#15 |
Registered User
Join Date: Jan 2009
Location: bean station tennessee
Posts: 398
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Re: are factory auto truck rears geared better or worse for highway
while i am not 100% sure without looking in the spec book i don't think the 3:07 rear end was available with the powerglide.the 3:73 was.the 3:07 was available as an option with the 3 speed.my father had an original 1964 chevy short fleet with the 230 6 cylinder,3 speed and 3:07 rear axle and it ran really well out on the highway.it would cruise at 60-65 mph all day long and was really easy on gas too,but gas was only .80 per gallon then lol.
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#16 |
Rollin' Old Skool
Join Date: Jun 2007
Location: Hattiesburg, MS
Posts: 5,371
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Re: are factory auto truck rears geared better or worse for highway
my '66 previously had 3.73's....we swapped in a '72 rear with 3.08's for better highway driving...but the truck originally had a 283/Powerglide combo, and the PO swapped in a 327
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_____________________________________________ Phillip My Build threads: 1966 Chevy C-10 "Black Betty" shortbed, fleetside, BBW, 327 V8/ Powerglide (under construction) http://67-72chevytrucks.com/vboard/s...ighlight=betty 1997 Chevy Tahoe, 2dr/2wd, mild custom (Daily driver) http://67-72chevytrucks.com/vboard/s...d.php?t=601142 Pics: '66 C-10 https://flic.kr/s/aHsjHWD4h9 '97 Tahoe https://flic.kr/s/aHsjGZ7wKP '93 C-1500 https://flic.kr/s/aHskxdpdnQ '88 S-10 Blazer https://flic.kr/s/aHsjYGx4Md Previous Rides: 1993 Chevy S-10 ext. cab, 4.3L, 4/5 drop (Sold) 1993 Chevy C-1500 short/step Retro-Rod (Sold) 1988 S-10 Blazer 2dr/2wd mild custom (Sold) |
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#17 |
Registered User
Join Date: Oct 2010
Location: Independence,KS
Posts: 1,477
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Re: are factory auto truck rears geared better or worse for highway
My 1969 C-30 had the Eaton HO72 with the 4.57 gears top speed- about 50! LOL! Just swapped out for a newer, but not as strong, corporate 14 bolt with 3.73 non locker. Highway driving is much more pleasant and the 427/TH400 doesn't have it's tongue hanging out after a trip down the highway.
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#18 |
Registered User
Join Date: Mar 2011
Location: Sacramento, CA
Posts: 28
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Re: are factory auto truck rears geared better or worse for highway
63 C10, was a 6cyl, 3 on the tree ... had 12bolt with 3.73's
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