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#1 |
Is that a Chevy 69...?
Join Date: Feb 2004
Location: Brownton MN
Posts: 112
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Buick 350 into GMC 4x4?
I have actually got 2 good running buick 350's from 1970 skylarks and I have a 68 GMC 3/4 ton that needs a V8. Is it possible to put the buick engine in? They put out almost 300 HP but I guess the main concern is mating it to a trans, its an NP205 in there now will it bolt up? I have a TH350 auto on the 350 but mating that to a 4x4, hard? Engine mounts are the other concern.
I have almost no cash to spend so getting a chevy v8 is out of the question unless you want to trade....
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Ahhhh, the wonderful sound of a rumbling V8. ![]() |
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#2 |
Registered User
Join Date: Apr 2004
Location: South Texas....the Valley
Posts: 199
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I got a Buick 350 in my 69 Chevy SWB Step Side. Its 2WD so I can't help you on the transfer case side. Motor mounts I fabricated from anle iron, square tube, and plate steel. Not a big deal if you can weld or have them welded.
I do know that the trans bolt up is different on the Buick, Olds, and Pontiac....but basically the rest of the trans is the same. Perhaps you can take the tail housing from your current 350 and tranfer it to a B.O.P. trans? My Buick 350 is a runnin' SOB ! ! ![]() Give it a try....I did and don't regret it other than the "higher cost" of Buick V-8 parts ! |
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#3 |
Is that a Chevy 69...?
Join Date: Feb 2004
Location: Brownton MN
Posts: 112
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ya in my case if I had a prob I have another buick 350 I could plop in. But you are saying it won't bolt up like the chevy 350 would to my trans which is an NP205 4 spd?
Good to hear someone did it. ![]()
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Ahhhh, the wonderful sound of a rumbling V8. ![]() |
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#4 |
Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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If I'm thinking right, the buick and the olds use the same motor mount, I know they use the same bell housing. The 5.7L diesel was a glorified 350 Olds. I'd find a early 80's or late 70's 5.7 diesel pickup in 4x4 and rob the tranny and motor mounts out of that, that would solve your problem with the transfer case. the motor mounts would still need some massaging to work right.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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#5 |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
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You can get a bellhousing off a Buick,Olds,or Pontiac that will work in that application.
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Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the *a$#* 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website |
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#6 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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It sounds like you'd just have to do a little tranny work. A BOP th350 case would bolt up to the engine. You'd need to rob the th350 output shaft out of an original 4x4 th350. As long as you're going through all that you may as well get a 700r4 that fits the back of that engine and put an advanced adapters output shaft in that transmission. Then you'd have the best of all worlds.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#7 |
Registered User
![]() Join Date: Apr 2004
Location: The Other Maine!
Posts: 2,236
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[QUOTE=sdmahr] Perhaps you can take the tail housing from your current 350
4x4 automatics do not have a tailhousing, bolts to the tranfer case. He needs to find an old Chevy 4x4 that came with an diesel ( oldsmobile Block ) not the Chevy diesel and then the Buick motor will work. The olds mounts also bolt up to Buick and in a 79 Chevy the holes were already in the motor towers to accept the olds motor mounts. The easiest solution is too buy the adapter plate for the tranny bolt pattern, I think around 80 bucks. Than you could install Buick, Pontiac, Olds, or Caddy engines in your Auto 4x4. Way harder to do on a 4 speed 4x4. I need to find an old bellhousing so I can put another 500 Caddy to work! Good luck, Buick 350 is a fine truck motor, more torque than Chevy. Mike
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1968 Chevy 4x4 307 4 speed |
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#8 |
Is that a Chevy 69...?
Join Date: Feb 2004
Location: Brownton MN
Posts: 112
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back again
I am getting more serious about trying this, With all the help you guys have been I am unclear on one thing, what if I Used the th350 thats currently on my buick engine, how could I get that hooked up properly to the transfer case?
If I figured that out I would just have mounts for teh engine and trans to worry about, (and maybe a drive shaft). ![]()
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Ahhhh, the wonderful sound of a rumbling V8. ![]() |
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#9 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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700r4 came in chevy bellhousing only I think. Yes, use your turbo 350 case, and the ouput shaft from the chevy tranny. Trans wil have to be disassembled to do the swap, might as well freshen it up while in there, but that could be expensive.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#10 |
Is that a Chevy 69...?
Join Date: Feb 2004
Location: Brownton MN
Posts: 112
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transmission/disassambled...
How disassembled? I haven't taken anything apart on a transmission before, I'm confident elsewhere but am I just taking off the output shaft from the existing (SM465)manual trans and putting it onto the back of the th350, (if I want the th350?)
OR Taking the bellhousing off the th350 and putting it on a 700r4(if I want a 700r4) OR Taking the bellhousing off the th350 and putting it on the manual (SM465) existing in the truck, (if I want to keep the manual.) (Not to mention mounting things to the truck) Thanks I'm sure I'll need help along the way.
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Ahhhh, the wonderful sound of a rumbling V8. ![]() |
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#11 |
Is that a Chevy 69...?
Join Date: Feb 2004
Location: Brownton MN
Posts: 112
|
"The easiest solution is too buy the adapter
plate for the tranny bolt pattern, I think around 80 bucks. Than you could install Buick, Pontiac, Olds, or Caddy engines in your Auto 4x4. Way harder to do on a 4 speed 4x4." If this is true I can just keep everything and put an adapter plate in and do motor mounts? That sounds great, anyone know where I can get an adapter plate from a 1969 buick 350 to an SM465 in a 68 GMC? ![]()
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Ahhhh, the wonderful sound of a rumbling V8. ![]() |
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#12 |
Project 2 Resume
Join Date: May 2004
Location: Jim Thorpe, PA
Posts: 884
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Here's a plate kit with spacers to adapt chevy to BOP block. http://cgi.ebay.com/ebaymotors/ws/eB...sPageName=WDVW i'm not affiliated with the seller but the cheapest price I've seen for a set up so far. I know board member c-1972 bought the exact same setup, from same seller, to bolt up to a caddy motor. maybe pm him to see how he made out. if going manual then an older BOP manual bellhousing should be fine with the sm465.
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John 1984 C30 Chevy Crew Cab Dually 1998 Jeep Cherokee 4x4 2004 Chevy Trailblazer 4x4 (wife's) 1970 Mustang FB fully tubed (getting 521 BBF & powerglide) 1978 Nova 2dr (going BBCaddy & S.P. th400) 1984 Monte SS (circle track car) |
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#13 |
Registered User
Join Date: Nov 2002
Location: Omaha/Grand Island, NE
Posts: 229
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Why not just use a 200R4 tranny instead. easier to hook to the NP205, better overdrive ratio, and many came with a dual bolt pattern, Chevy and BOP. The one in my Monte SS has the dual bolt pattern. They also used this tranny in Grand Nationals, Cutlasses, and Grand Prixs. Built correctly, it can be stronger than the 700. I am putting about 300hp through my stock one right now.
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1972 GMC Jimmy 4x4 1985 Chevy Monte Carlo SS 1996 Saturn SC-2 1996 Ford Explorer XLT -Wife's rig |
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#14 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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but, but but...
To hook up to the factory adapter you need to worry about the BACK of the transmission. The "adapter" in a 4x4 is a factory piece. I'm guessing here but I bet you could use a factory BOP th350. Take the tailhousing off. Install the output shaft from a factory 4x4 th350 transmission into the BOP th350. Then bolt the BOP th350 with no tailhousing and 4x4 output shaft to the factory np205 to th350 adapter. I'm not sure if a 4x4 output shaft exists for a 200-4r transmission.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#15 |
user # 2756
![]() Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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Use a divorced transfercase, get a NP205 from a 69-74 dodge.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm ![]() |
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