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| Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here. |
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#1
January 14th, 2023, 09:05 PM
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Swapping 4:10 Dana 60 gears to 3:54's
Where do I get 3:54's that fit one for one with my 1966 1500 series stock Dana 60 axles and housing? If one of you has them, thats good - tell me how much and lets get them on the way to Alabama. Don't want to swap the whole rear end really because that seems stupid. If ordering from Yukon gear is the best way, then fine - I was told 67-72's had 3:54's and would fit my housing and axles so someone on here outta know
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My 60-66 GMC Projects: 1960 1001 Custom Cab short wideside BBW, 305A V6, factory PB, Hood Jet, Radio and Hydramatic. 1962 K1000 4x4 short wideside, BBW, 305D w/ SM420, PTO Winch 1965 1500 Custom Cab w/ Factory assembly-line installed AC, PS & PB, and rare GMC sliding rear glass 1966 1001 Custom Cab short wideside, w/ 351E, PS, PB, AT, super rare Sport Trim option interior (bucket seats) 
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#2
January 15th, 2023, 03:21 PM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
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#3
January 17th, 2023, 06:06 AM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
You may also need a new yoke. If your old yoke is a 10 splines. The new one should be a 29 splines to match the new pinion.
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#4
January 19th, 2023, 04:19 PM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
Im not finding factory 3:54s, at least in a 1969 GMC Data book . They do show a 3;73 as an RPO in a 2500 series D60 . I think your only option is to buy the gear new for that truck
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#5
January 21st, 2023, 06:23 PM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
I found this.
P/N 2448081 is for the GMC Dana 60-35 Ratio 3.54 1962-65. My book only goes to 65. The number was replace with 3940104 gear Assy. (Dana 24813x) and 3940103 Yoke (Dana 24813x) If your case number is 30357 (4.10 and down) it will fit. Dana application chart 24813x https://danaproparts.com/i-30497936-...wsm-prod-tab-1 Dana 24813-5x includes the bolts and pinion nut. Summit https://www.summitracing.com/parts/sdh-24813x NOS 3940104 https://www.oldsobsolete.com/product...et-gm-3940104/ Last edited by gmcjuniorvan; January 21st, 2023 at 07:48 PM.
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#6
January 22nd, 2023, 07:32 AM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
3.54 ratio Dana 60's were optional in '68 1500's and 2500's with the 351E V-6 and 396 V-8, but no other engines.
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#7
January 23rd, 2023, 07:36 PM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
Quote:
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My 60-66 GMC Projects: 1960 1001 Custom Cab short wideside BBW, 305A V6, factory PB, Hood Jet, Radio and Hydramatic. 1962 K1000 4x4 short wideside, BBW, 305D w/ SM420, PTO Winch 1965 1500 Custom Cab w/ Factory assembly-line installed AC, PS & PB, and rare GMC sliding rear glass 1966 1001 Custom Cab short wideside, w/ 351E, PS, PB, AT, super rare Sport Trim option interior (bucket seats)
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#8
January 23rd, 2023, 07:38 PM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
Quote:
__________________
My 60-66 GMC Projects: 1960 1001 Custom Cab short wideside BBW, 305A V6, factory PB, Hood Jet, Radio and Hydramatic. 1962 K1000 4x4 short wideside, BBW, 305D w/ SM420, PTO Winch 1965 1500 Custom Cab w/ Factory assembly-line installed AC, PS & PB, and rare GMC sliding rear glass 1966 1001 Custom Cab short wideside, w/ 351E, PS, PB, AT, super rare Sport Trim option interior (bucket seats)
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#9
January 23rd, 2023, 07:50 PM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
[QUOTE=gmcjuniorvan;76584]If your case number is 30357 (4.10 and down) it will fit.
Where is this case number stamped on the housing just so I can check and be certain before jumping here 
__________________
My 60-66 GMC Projects: 1960 1001 Custom Cab short wideside BBW, 305A V6, factory PB, Hood Jet, Radio and Hydramatic. 1962 K1000 4x4 short wideside, BBW, 305D w/ SM420, PTO Winch 1965 1500 Custom Cab w/ Factory assembly-line installed AC, PS & PB, and rare GMC sliding rear glass 1966 1001 Custom Cab short wideside, w/ 351E, PS, PB, AT, super rare Sport Trim option interior (bucket seats)
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#10
January 24th, 2023, 12:04 AM
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Re: Swapping 4:10 Dana 60 gears to 3:54's
I see you have 4:10 now, if it is not a power lock it should be case 30357. Like I said my book only goes to 65. It’s a casting number on the “back” of the case. The yoke is a Dana 3-4-5731-1X. Had the wrong number in my post.
The picture is from a Chevy 20 1965-70 Dana 4:56 30358.
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