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06-02-2013, 10:20 PM
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#1 |
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Registered User
Join Date: Jul 2008
Location: Taunton, MA
Posts: 224
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Gears on 5.3 swap
Just wondering what some of you guys are running for gears behind your 5.3 swaps and what your tire size is.
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67 C10 2wd Stepside (to be fleetside), Factory AC truck, Big Back Window, just got a 6.0/6l90e to jam in it now..... Needed: paint and lots of it. and i'm sure lots more misc. parts. Project 67 short step Build Thread 01 Sierra Crew 6.0 2015 Ford F150 Work gave me truck i really wouldn't buy a ford. |
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06-02-2013, 10:35 PM
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#2 |
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Registered User
Join Date: Sep 2010
Location: DFW, TX
Posts: 22
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Re: Gears on 5.3 swap
I went with the 3.42 ratio. This was the gear ratio in the '08 GMC donor truck. Still working on putting the truck together.
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06-02-2013, 11:54 PM
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#3 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Gears on 5.3 swap
Just going by the 02, she runs way getter with the 3.73's (29" tire). Longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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06-03-2013, 08:21 AM
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#4 |
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1965 Chevy C10, 2005 4.8L/4l60
 
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,539
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Re: Gears on 5.3 swap
I have the 4l60e and I used to run 3.08's and it bogged a lot on highway. now i run 3.73's and it has a lot more bottom and highway driving is much nicer too.
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Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684  support our troops! |
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06-03-2013, 02:36 PM
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#5 |
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Senior Member
Join Date: Jul 2009
Location: Hayden, Al.
Posts: 4,147
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Re: Gears on 5.3 swap
I have a 3.42 with a 4L60e and a 29" tall tire. I had this tire & rearend in my last vehicle with a 700r4 and I didn't hate it, but I do wish I'd a gone with a 3:73.
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06-03-2013, 07:38 PM
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#6 |
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Registered User
Join Date: Jul 2008
Location: Taunton, MA
Posts: 224
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Re: Gears on 5.3 swap
Well that makes me a little happier. I found a posi unit (4 series) with 3.73's in one of my extra rear ends and was thinking they may be to high for the 5.3 but i guess i'll be rebuilding that one now. Thanks everyone.
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67 C10 2wd Stepside (to be fleetside), Factory AC truck, Big Back Window, just got a 6.0/6l90e to jam in it now..... Needed: paint and lots of it. and i'm sure lots more misc. parts. Project 67 short step Build Thread 01 Sierra Crew 6.0 2015 Ford F150 Work gave me truck i really wouldn't buy a ford. |
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06-06-2013, 10:53 PM
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#7 |
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Registered User
Join Date: Dec 2012
Location: Fox Island, WA
Posts: 135
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Re: Gears on 5.3 swap
Truck doesn't have the 5.3 yet.
I'm going to swap in the 5.3/5-speed tranny first, then drive it with the current 4:10 ratio long enough to determine what the best ratio would be. This should avoid any "I shoulda/coulda" type regrets, or multiple experimental swaps to find what works best. |
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06-07-2013, 12:10 AM
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#8 |
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Collector of Projects
Join Date: Apr 2003
Location: Las Vegas
Posts: 3,106
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Re: Gears on 5.3 swap
Try a gear ratio calculator... plug in the blanks and it will tell you RPM at MPH ...
http://www.summitracing.com/expertad...tio-calculator |
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06-07-2013, 02:41 PM
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#9 |
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Registered User
Join Date: Dec 2008
Location: Berryville, AR
Posts: 792
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Re: Gears on 5.3 swap
I have a 6.0 with 3.42 gears. I am sure that 3.73's would bring her performance up, but honestly she has plenty of pep already and even with the 4l80e tranny I am still getting close to 19 mpg. I am more than happy with both.
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Rex |
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06-07-2013, 03:08 PM
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#10 |
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It's alsways something.....
Join Date: Nov 2008
Location: Douglasville GA
Posts: 1,171
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Re: Gears on 5.3 swap
My 71 2wd Blazer with 5.3 and 4l60, 3:73 is pretty tough.....I think that it would spin the tires all the way through 2nd gear. The acceleration with the 3:73 is really fun. I am running truck rallys with 275/60 R15 BFG
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1968 RS Camaro 'Vert Matching number 327 and M21 Muncie 1968 C10 Black with red interior and orig paint. 5.3 / 4l60e,3:73 POSI 17" Torq Thrusts 1968 CST 514 Red with black interior. Buddy Buckets, Factory A/C, PS, PB- 20" AR custom shop TT, 5.3 and 4l60e |
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06-08-2013, 07:56 PM
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#11 |
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Registered User
Join Date: Sep 2009
Location: ottawa,canada
Posts: 4,550
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Re: Gears on 5.3 swap
lq4 6.0l/4l80e, posi 3:42 gears 28" tire.... 1900 rpm @ 60 mph.
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my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682 |
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06-08-2013, 10:57 PM
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#12 |
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Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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Re: Gears on 5.3 swap
4.10s + 4L60E with 315/35/20s = Fun. It will be a little more fun once I get a higher stall converter too. I'm sure its costing a few MPG, but I have 1500 miles on it in 3 years....so I'm not too concerned (still get 16+)
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