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#1 |
Registered User
Join Date: May 2014
Location: Mission BC
Posts: 452
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1972 K10 --Help me decide 5.3/4l60E swap or 700R4
Hey all, just picked up a 1972 K10 custom deluxe in decent shape. Currently 350/350 and runs great.
Recently rebuilt engine and tranny by PO..running 33"x 9.50 x15 tires and it has a lot of power so I suspect it has 4.10's I am trying to decide whether to do a 5.3/4l60e swap or just replace the tranny with an 700r4 (or 2004r---have core). Trying to get the rpm's down a bit and mileage up. I did a 5.3/4L60e swap on my 62 C10 before I sold it and it was great..I can do the re-pin of the pcm... Anyone care to share their 700r4 or 5.3/4l60 mileage numbers? Thanks
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1962 C10 Longbox LS 5.3 4L60E----Sold$$ 2014 Ram 4x4 3500 Laramie Diesel..Momma's truck 2015 Ram 4x4 1500 1997 Boxster. 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped |
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#2 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
200-4R is out unless you want to invest in a divorced transfer case.
The 5.3l/4L60e is popular but more work and expense in 4WD due to the vehicle speed sensor adaptation. 700R4 needs the engine moved forward, exhaust extended, radiator hoses shortened and a special output shaft to mate to the transfer case. I don't have any mileage figures from my Suburban. Sorry
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#3 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
Concur 2004R best option.
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#4 |
Registered User
Join Date: Nov 2008
Location: Gwinnett GA
Posts: 1,803
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
Keep it 350! How about an NV4500 swap for OD?
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1982 K10 SWB 1987 V20 - Sold - Doh! |
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#5 |
Registered User
![]() Join Date: Dec 2014
Location: Loveland, CO
Posts: 179
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
If it runs great, why not leave it and put a gear vendors OD unit on the output. This from a guy that pulled a 350 and put a 700r4 in my 72 K10.
Should a, could a, would a. Just my 2 cents.
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1971 K10 short bed step side, 5.3/th350/205, 3.73 gears |
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#6 |
Registered User
Join Date: Sep 2012
Location: SoCal
Posts: 529
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
i have an L33 5.3/4L65e combo in my 2wd swb
blackbear performance tune cold air intake headers/x pipe/flowmasters 3.42 with eaton posi I drive about 400-500 miles a week and avg 23 mpg |
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#7 |
Registered User
![]() Join Date: Mar 2014
Location: Las Vegas Nevada
Posts: 93
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
X2 with Bigdav160.
I have done all that he indicated to have the 700R4 installed (not on the road yet). A guy should consider front driveline issues coming up with clearance to 700R4 pan. I did a 2.5" lift (actually 3 when it was compared to original) and that helped a little on clearance issues, but still will have to have a custom front drive shaft. Not a huge deal, lots of competent shops out there, just one more thing....
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72 K10 |
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#8 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,387
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
Very nice truck. I went with a 700r4 in my k20 and have a th350 in my k1500 ( w 3.73 gears) both w 33" BFGs. I can't give you mileage though sorry. Unless you expect to do a lot of driving I'd suggest sticking w the th350 and change gears as needed to drop the rpms.
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
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#9 |
Registered User
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,134
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
I personally would explore the 700 r4 first
going with an LSX swap requires a new front crossmember and lift which it looks like you are already lifted Either way your spending a lot of cheddar depending on how much work you can do yourself |
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#10 |
Senior Member
![]() Join Date: May 2012
Location: Scottsdale, AZ
Posts: 1,906
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Re: 1972 K10 --Help me decide 5.3/4l60E swap or 700R4
The work is hard,
The pay is low, But we're still here, Still on the go! The payloads high, the gears are low, Average speed is very slow! My brains gone soft, my liver hard, your best MPG is parked in the yard!!!! SBC.... ![]()
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White K20 Last edited by jeffahart; 08-08-2016 at 12:53 AM. Reason: Because it's Sunday... waaaay past beer thirty! |
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