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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Driveshaft lengths
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Topic: Driveshaft lengths (Read 13882 times)
Mhoihjelle
New Users
Posts: 2
Newbie
Driveshaft lengths
«
on:
April 07, 2017, 07:21:16 AM »
Hey guys i am haveing a hard time finding out any info if my driveshafts will work
I have a 1975 k20 4x4 dana 44 fr, 14bolt 10.5 rear,smh465,and 205tcase, i am putting a 6 in lift in and want to know will my driveshafts works if you dont have a k20 with the exact drivetrain as me please dont comment thanks for any info
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Captain Swampy
Junior Member
Posts: 504
Wisconsin
Re: Driveshaft lengths
«
Reply #1 on:
April 07, 2017, 09:08:04 AM »
I think once you go past 4" you need to lengthen the drive shafts.
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1987 350TBI 700R4 4X4 4.56 gears 33" BFG All Terrain
http://forum.73-87chevytrucks.com/smforum/index.php?topic=32209.0
1967KaiserM715
Junior Member
Posts: 914
1985 GMC K1500 w/ 6.5 TD
Re: Driveshaft lengths
«
Reply #2 on:
April 07, 2017, 12:21:54 PM »
It's never about exact combo it's about actual lift. Generally you don't need to lengthen shafts up to 4", and I have seen instances were two near identical trucks needed slightly different shaft lengths to properly function.
The only way to know if a shaft will work is to measure BOTH compressed and extended lengths- this holds true with shocks as well- I just put add a leafs on my truck, and while 90% don't use new shocks, my rears will not fit(too short).
Sent from my LGL34C using Tapatalk
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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35 1967 M715(not running)
1986 Chevy K30(under repair)
Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: Driveshaft lengths
«
Reply #3 on:
April 08, 2017, 08:35:23 AM »
dont know why you guys are commenting. the guy said he has a smh465, wont find anyone with that trans
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: Driveshaft lengths
«
Reply #4 on:
April 08, 2017, 08:44:37 AM »
but seriously, each lift will be different, i have a 70ish k20 with a sm465/205 and 6" lift. the rear driveshaft will fit and so will the front BUT the front will be maxed out and will wear quickly. the splines will be the part that fails.
also if you havnt got the lift yet check out this
Lift kit Q & A
and
Cheapest 4" lift with skyjacker springs for under $700 with everything you need
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
Mhoihjelle
New Users
Posts: 2
Newbie
Re: Driveshaft lengths
«
Reply #5 on:
April 09, 2017, 04:19:15 PM »
Thank irish_alley for your info i will get a fr driveshaft before i install thanks again
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Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: Driveshaft lengths
«
Reply #6 on:
April 12, 2017, 01:05:30 PM »
no problem. you might find one in the junkyard also. the 465 is i think the smallest trans so if you can find one for an auto then it should be a few inches longer, but be warned your truck SHOULD have the yoke style front shaft in 77ish they changed to a flange style. theyre not compatible even with a yoke swap, you can make it work but you need the front output shaft from the flange style and flange
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Driveshaft lengths