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#1 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Need some help, rear end swap
Alright so I have a 1969 C20 with a 350 and th350 running 4:10's in the rear. I plan on bagging the truck within the next few months but i want to change to 1/2 ton and 4 link the rear. I want to increase my mpg and take strain off the motor on the freeway. I dont have a tach but when running around 60-65 on the freeway it sounds like the truck wants to blow up. "literally" I wanna know what 1/2 ton axle "out of what year model truck" would you guys reccommend and what gear ratio i should look for. "I wanna swap a 700r4 for the trans but that depends if i have the cash to do it at the same time. but I will be doing a 700r swap for sure in the future. just a matter of time. anyway the plan is to bag the truck on 20's possibly 22's in the rear, I wanna know what the best rear end/gear ratio would be to put under this for cruising and mpg. Thanks for any help guys.
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Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#2 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,151
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Re: Need some help, rear end swap
I would go in reverse and do the trans before the rear. The deep overdrive of a 700R4 (.7) will make your 4.11 be a 2.87 in OD with the converter locked but still give you a stout out of the hole for towing or hauling.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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#3 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Need some help, rear end swap
ok i see your point in that. only question is I have to change my rear before i bag it because im 4 linking with a custom kit. so if i bag it first then swap my rear ill have to do a new 4 link. If i could change both the rear and the trans what is the best option? "ie. gear ratio and what truck should i pull it from?
__________________
Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#4 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Need some help, rear end swap
or should I just stick with the 4:10's?
__________________
Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#5 |
Registered User
Join Date: Jul 2009
Location: Russellville, Arkansas
Posts: 1,699
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Re: Need some help, rear end swap
Actually you'd just have to weld the brackets on a new rearend at the future date if you decide to change rearends. You could still keep the 4-link arms.
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#6 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Need some help, rear end swap
ok that makes sense. Well when i do change the rear end what gear ratio would anyone recommend?
__________________
Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Need some help, rear end swap
I would go with a 3.73 rear
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#8 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Need some help, rear end swap
do you happen to know what year chevy 1/2 ton i can pull this out from under?
__________________
Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#9 |
Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: Need some help, rear end swap
I would say any 73-87 and same year 'burbs including 88-91. My rear is from a 79 C-10. I just had to change the perches since the donor was a leaf spring truck. The driveshaft bolted to the rear end differently, too. Straps as opposed to u-bolts.
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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