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#1 |
Registered User
Join Date: Dec 2003
Location: albuquerque
Posts: 431
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hello all. This past weekend I picked up a 68 gmc lwb 3/4 that is in great shape! It came equipped with the 351C V-6 with a three speed (was three on the tree but converted to a floor shift) and power assisted brakes (drums sadly). Now that you know what I have here is what I want to do:
1. convert the front-end to have power-assist disk brakes, power steering and five-lug bolt pattern. From what I've read so far a cross member from a 73-80 should do the trick? 2. replace the heavy rear leaf springs with some from a 1/2 ton. What year of chassis do I need to take care of this? 3. replace the rear differential (dana 60?) to what? and from where? 4. replace the original three speed with a four speed but not one with the granny gear. any ideas here? 5 and finally what do I do about that split drive shaft? do I wait until I get that four speed and differential swapped to get a better idea? From all I have read so far there seems to be some very creative folks out there... Any help appreciated! donovan |
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#2 |
Seeker of the big and bad
Join Date: Nov 2000
Location: wheatland,Calif,yuba
Posts: 105
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1) With a little shim stock the a arm front from 73 up fits good
2)You should try to find leavs from our year trucks because the73 up models are longer. 3)My brother took axels (5 lug)from a lte model truck and swapped them in a early 12 bolt rearend. 4)If you want a 4 with out the granny,well I'm not sure,the other guys here know witch one you need but I've found a 90-95 5 speed fit pretty good. 5)yes I would wait till you get your setup together before your set your mind on a driveline. Hope this helps
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71 3/4 ton 4x4,665hp 454. 67 GMC 1 ton towtruck 68 chevy LB 4x4 64 chevy LB custom 57 Bel-air 2d station wagon |
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#3 |
Registered User
Join Date: Dec 2003
Location: albuquerque
Posts: 431
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When you indicated with a few shims the 73 a-arms would fit, did you mean just the arms or the entire crossmember?
thanks... |
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#4 |
Seeker of the big and bad
Join Date: Nov 2000
Location: wheatland,Calif,yuba
Posts: 105
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The whole crossmember will bolt in but you are left with a little gap between the a arms and the frame. Alittle is like a 1/16 or so.you want to shim it so it fits tight,and won't tweak your frame when you snug it down.
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71 3/4 ton 4x4,665hp 454. 67 GMC 1 ton towtruck 68 chevy LB 4x4 64 chevy LB custom 57 Bel-air 2d station wagon |
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#5 |
Registered User
Join Date: Dec 2003
Location: albuquerque
Posts: 431
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thats helpful to know...
thanks again... |
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#6 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Welcome to the board from South Mississippi!
With a LWB you are probably stuck with a two piece drive shaft unless you want to spend some major money.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. ![]() We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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#7 |
Account Suspended
Join Date: Jan 2003
Location: Shadow of Lambeau Field
Posts: 5,597
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Welcome to the board from Tennessee. Let's see some pics
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#8 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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yes welcome
I would like to expand on a question for myself. I too just purchased a 69 GMC 3/4 but mine is a 4x4 what can I do for disk front brakes on this. I believe I would want to keep the 8 lug. It just looks tougher
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#9 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,684
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Custom 68, I believe starting in 1970 you can find disks on the 3/4 ton front axles. They are a direct bolt in. Try to get one like from a late 70's as those Dana 44's were stronger. If you got lucky you could score a Dana 60 (1 ton front axle) but they aren't the easiest to find. Still an easy swap if you find one.
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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#10 |
Registered User
![]() Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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No mention of ripping out the v-6 and sticking in a small block. It's good to be different
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#11 |
Registered User
Join Date: Dec 2003
Location: albuquerque
Posts: 431
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I've always liked doing things a bit different than everyone else. And I like the looks on the parts guy face when I tell them I have a 350 V6!
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#12 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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The 351 is a kick @ss engine...pull anything you hook up to.
You'll want to look at your bellhousing shape and bolt pattern. The question has come up before, and I'm not sure how it came out as in is it a chevy bellhousing, a BOP...or something weird. The 2 pc shaft is fine. just install good components, and it'll last a long time. To do a 1 pc properly will cost you more than you'd ever want to spend. Most shops wouldn't even touch that, and 1/2 the ones that would...shouldn't. Welcome to the board. If you have not seen this site on the V-6...you need to read it. Tons of awsome info on there. http://www.6066gmctrucks.org/305V6.htm |
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#13 |
Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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351 V6...sweet! You don't usually see too many 305 V6 trucks, and yours is the first i've heard of with the 351. got any pics of the glovebox sticker?
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1969 GMC K2500 ![]() 1996 Honda Accord 2007 Kawasaki KLR 650 |
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#14 |
Registered User
Join Date: Dec 2003
Location: albuquerque
Posts: 431
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Unfortunatley no sticker in the glove box, and I wish I could get a good picture of the block where the markings are... Anyway here are a few pictures that I took earlier today.
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#15 |
Registered User
Join Date: Dec 2003
Location: albuquerque
Posts: 431
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#16 |
Registered User
Join Date: Dec 2003
Location: albuquerque
Posts: 431
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#17 |
Born To Lose Club
![]() Join Date: Feb 2003
Location: Calgary, Alberta/Oxenden, Ontario, Great White North
Posts: 13,306
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Nice truck! very nice V-6 too!
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Brian Smith ![]() 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 20 Yrs - 1 of 208 Built & Sold In Canada! - 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 2 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 15 Yrs - 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 13 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 6 Yrs - 24HP Diesel/H120/54D/260B/SB1154. |
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