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08-26-2018, 11:28 AM | #1 |
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Rear axle options, 1964 GMC C2500
I have a friend who has a 1964 GMCc2500 longbed with leaf springs, and he is looking to upgrade the rear axle to a higher gear for better freeway driving.
Current setup per him- 1986 454 Th400 8 lug rear end, 5,13 gearset, leafspring perches 28 inch tall tires rear, 27 inch front tires So we were thinking 3.55 or 3.73 gears, what can were use as a donar? Maybe a 1973-1980 Suburban C20 with 3.73?
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1969 307, t350 1950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT |
08-26-2018, 11:58 AM | #2 |
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Re: Rear axle options, 1964 GMC C2500
3.73s and 28" tires. Everyone wants to do 75 but no one wants to spend the money on overdrive. My 81 did 3000rpm at 75 350/350 3.08s and 27 in tires
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08-26-2018, 12:26 PM | #3 | |
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Re: Rear axle options, 1964 GMC C2500
Quote:
Currently the 5.13/28/th400/2500rpms =40.6mph Thinking the 3.73/28/th400/2500rpms = 55.85mph Or maybe the 3.55/28/th400/2500rpms=58.69mph Just trying to get an easy to swap gear from the 5.13 that is in it now. Overdrive may come later. With a 4l80E- 5.13/28/4l80e/2500rpms-54.15mph So the axle gearset has to change.
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1969 307, t350 1950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT Last edited by Warrens69GMC; 08-26-2018 at 05:41 PM. |
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08-26-2018, 02:07 PM | #4 |
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Re: Rear axle options, 1964 GMC C2500
I'd convert over to a 14-bolt.
. http://67-72chevytrucks.com/vboard/s...d.php?t=624445 . http://67-72chevytrucks.com/vboard/s...d.php?t=550878 .
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08-26-2018, 02:10 PM | #5 |
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Re: Rear axle options, 1964 GMC C2500
Oops, I'm sorry. I saw you already alluded to that at the end of your post.
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08-26-2018, 11:01 PM | #6 |
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Re: Rear axle options, 1964 GMC C2500
You could also look at a 34” tall tire 255x85x16 tires on newer chevy 3/4 ton wheels(6.5x16) with the 4 nubs, around 1972. I have the toyo M55 tires in this size and they are 34” tall.
Les |
08-27-2018, 12:20 AM | #7 |
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Re: Rear axle options, 1964 GMC C2500
With a 454 you could likely get away with a 3.08 gear. But finding a 14 bolt with those gears won't be easy.
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08-27-2018, 12:46 AM | #8 |
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Re: Rear axle options, 1964 GMC C2500
What years for the 14 bolt? He wants a bolt in, no major mods to get it in.
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08-27-2018, 02:16 AM | #9 |
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Re: Rear axle options, 1964 GMC C2500
what axle is in it now? I picked up a leaf sprung D60 out of a 66 gmc with 4.10 and limited slip for $400..
if it has a dana in it, carrier swap and gear choice of that range may be possible and certainly easiest fix.. I believe carriers change between 4.10 / 4.56 so 4.10 carrier or complete axle with one would take taller gears.. good luck!
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08-27-2018, 12:12 PM | #10 |
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Re: Rear axle options, 1964 GMC C2500
Reaching into my memory so the measurements may not be 100%
Spring center bolt spacing on your gmc 40" 73 up square body C20 43" with a 6" tall frame center section 73 up C30 40" also includes all the 3+3 crew cabs with a 9" tall frame center section But if you have a Dana 60 in it I would switch the gears and carrier and be done IMO All those rears you'll find now are at least 40 yrs old and will more than likely need money put in them to make reliable. When I did mine the donor trucks were not very old and the GMC brake drums were scarce(early 80's) Good Luck |
08-27-2018, 12:54 PM | #11 |
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Re: Rear axle options, 1964 GMC C2500
^ good point there.. forgot about this thread where I found a bunch of similar info..
http://67-72chevytrucks.com/vboard/s...d.php?t=535453 post 8 in particular expands a little on what Bud posted above.. interested to see what's in there now, good luck!
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08-28-2018, 08:29 PM | #12 | |
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Re: Rear axle options, 1964 GMC C2500
Quote:
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08-28-2018, 09:50 PM | #13 |
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Re: Rear axle options, 1964 GMC C2500
I contacted him to get me pictures.
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08-29-2018, 01:55 PM | #14 |
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Re: Rear axle options, 1964 GMC C2500
If you are looking for a bolt-in swap, you may want to look at a Dana 60 from an 71-72 F250. When I converted my 65 GMC Suburban from 6 lug axles to 8 lug, I used a Dana 60 from an 72 F250 and it fit without modification to the spring perches. These can be had pretty cheap and there are plenty of gear choices available.
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09-01-2018, 06:20 PM | #15 |
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Re: Rear axle options, 1964 GMC C2500
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1962 shortbed 408cui small block, TKO 600 5-speed, bagged Porterbuilt suspension. 18" Salt Flats http://www.cardomain.com/ride/332579...t-c-k-pick-up/ http://67-72chevytrucks.com/vboard/s...d.php?t=560081 |
09-27-2018, 09:26 AM | #16 |
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Re: Rear axle options, 1964 GMC C2500
pics
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1969 307, t350 1950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT |
09-27-2018, 06:03 PM | #17 |
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Re: Rear axle options, 1964 GMC C2500
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
09-27-2018, 11:54 PM | #18 |
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Re: Rear axle options, 1964 GMC C2500
That's a Dana 60.
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09-28-2018, 12:05 AM | #19 |
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Re: Rear axle options, 1964 GMC C2500
^ yep, sure looks it
check the casting numbers to be sure.. carrier groups determine available ratio ranges.. axle spline are also relevant, but for the most part, Dana axles are fully supported in the aftermarket.. general info https://en.m.wikipedia.org/wiki/Dana_60 I covered some Dana info here, good luck! http://www.67-72chevytrucks.com/vboa...48&postcount=8
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