Olds 455 mate up to a '79 350 Diesel trans? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

3QTRTONS · 03-17-2012, 08:57 PM

Buying 2 GMC Diesel SWBs from another Member (

)......
Wondering if I can pull the 350 Diesel out of this '79 and install a '76 Olds 455, using the 'Diesel' trans?
ANYONE done this...... appreciate the input!

Btw, BOTH are going "back in service"

BLE 'BURBAN · 03-17-2012, 09:21 PM

You sure can. The 350 diesel was an oldsmobile 350 block. so if it's still got the 350 diesel in it then you've got half the battle taken care of.
Note that the engine mounts on the olds engine are bolted to the front and center boss's on the engine to get them to line up with the frame mounts. I found out the hard way I had mine too far back on the block when I dropped my olds455 into my old '74 C10. (pulled it outta my cutlass tranny and all thinking it would "just bolt right in" )

3QTRTONS · 03-17-2012, 09:54 PM

Awesome! I haven't ID'd the rear end in the '79..... hopin that its gonna be liking the new engine. If not, I DO have a GMC '75 rear thats either 3.73 OR 4.11 (could be interesting).
So keeping the Diesel TC & governor is ok? Low end is what I wanna end up with...... can't get away with speeding too much around here. Rather spend the $$$ I got on more TRUCK PARTS anyway.

**Corts60** · 03-17-2012, 11:32 PM

I could be wrong but I think you will need to change out the torque convertor. . .

Also, if you are not keeping them diesel and aren't interested in any of the diesel emblems, I would be interested in them.

Let's see some pics!

KQQL IT · 03-18-2012, 12:05 AM

I got a diesel 12 bolt at a junkyard. Was 2:73 was great with a 27" tire
Posted via Mobile Device

86c20 · 03-18-2012, 12:14 AM

you will have to change the tc as the stall will be low the rear end my be a hight gear then you think as some where 3.73 as the 5.7 are gutless. all so the 350 diesel is a good motor but got a bad rap for the injection pumps being junk. some poeple will buy them right up and all the parts to.

**Corts60** · 03-18-2012, 01:00 AM

Quote:

Originally Posted by KQQL IT

I got a diesel 12 bolt at a junkyard. Was 2:73 was great with a 27" tire
Posted via Mobile Device

The early diesels usually were paired with these tall gears which made amazing mpg numbers and rendered them completely useless to tow anything or move out of their own way. I run 3:73's in my diesel and it is an excellent combo.

BLE 'BURBAN · 03-18-2012, 03:37 AM

My '74 C10 had a 12 bolt with 3:07 gears in it. Got great highway mileage and with the massive torque from the olds 455, I was more than capable of chasing down the occasional 'vette or camaro or 'stang all the while they're wondering what the he** I'm running.....A ROCKET ENGINE!!!!! LOL

3QTRTONS · 03-18-2012, 06:49 AM

So I'm looking to get another TC. Dunno s--t from green apples bout that (ANY 350 TC?), but I'm sure gonna see what the rear gear is first....
This is my first SWB & I wanna do it the right way....kinda like Jr Prom nite.

I'll get pics in the flow... haven't paid the final $$$ yet... These 2 weren't on my radar.

Hey Corts 60, you are 1st in line when the '79 Emblems go up 4 sale. The '85 that my son talked me out of is a Sierra Grande on the SPID, but has High Sierra Diesel fender emblems! Never seen em before; and he ain't givin em up!

He's all excited - SWB that'll have "the look" AND can get 25mpg!

The 350 Diesel stuff is going to be up 4 sale as soon as I pull the motor. The people that have those would love to get hold of some original parts for backup I'm sure.

I really appreciate the feedback, keep it coming! Pix soon......

**Corts60** · 03-18-2012, 02:17 PM

Hey bud, I think you'll be happy to know that you have two T400's coming your way, not T350's. The T400 was the only tranny offered with the 5.7 during those years. And the axle (if original) will be one of three: 2.76, 3.08, or 3.40

3QTRTONS · 03-18-2012, 07:59 PM

Hey,
I'm REAL happy to hear that! IMO, any of those rears would be great with my 455! And with a T400, I could haul about anything, INCLUDING a--!!!

The '85 my son talked me out of is a 6.2 that starts & runs REAL GOOD! I'm wondering if I could use the running gear out of an '85 CUCV 4x4 Blazer for his?
3.08 front and rear, 700R4, can't remember what transfer case. Rest of the vehicle was a 2-to-make-1 deal, and I got the suspension/driveline. Oh, maybe should start this one in another thread..... not too savvy on protocol, yet.....

Pix as I get em.

03-17-2012, 08:57 PM	#1
3QTRTONS Registered User Join Date: Mar 2010 Location: Warren, ME. Posts: 235	Olds 455 mate up to a '79 350 Diesel trans? Buying 2 GMC Diesel SWBs from another Member ()...... Wondering if I can pull the 350 Diesel out of this '79 and install a '76 Olds 455, using the 'Diesel' trans? ANYONE done this...... appreciate the input! Btw, BOTH are going "back in service" __________________ 1969 ES5500 B E A S T 1976 K20 Suburban 1983 C10 'farm truck' 1984 K10 Suburban 1988 V30 Fire Truck 1941 Dodge WC18 Ambulance 2000 GMC Bus (parts warehouse)

03-17-2012, 09:21 PM	#2
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: Olds 455 mate up to a '79 350 Diesel trans? You sure can. The 350 diesel was an oldsmobile 350 block. so if it's still got the 350 diesel in it then you've got half the battle taken care of. Note that the engine mounts on the olds engine are bolted to the front and center boss's on the engine to get them to line up with the frame mounts. I found out the hard way I had mine too far back on the block when I dropped my olds455 into my old '74 C10. (pulled it outta my cutlass tranny and all thinking it would "just bolt right in" ) __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

03-17-2012, 09:54 PM	#3
3QTRTONS Registered User Join Date: Mar 2010 Location: Warren, ME. Posts: 235	Re: Olds 455 mate up to a '79 350 Diesel trans? Awesome! I haven't ID'd the rear end in the '79..... hopin that its gonna be liking the new engine. If not, I DO have a GMC '75 rear thats either 3.73 OR 4.11 (could be interesting). So keeping the Diesel TC & governor is ok? Low end is what I wanna end up with...... can't get away with speeding too much around here. Rather spend the $$$ I got on more TRUCK PARTS anyway. __________________ 1969 ES5500 B E A S T 1976 K20 Suburban 1983 C10 'farm truck' 1984 K10 Suburban 1988 V30 Fire Truck 1941 Dodge WC18 Ambulance 2000 GMC Bus (parts warehouse)

03-17-2012, 11:32 PM	#4
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: Olds 455 mate up to a '79 350 Diesel trans? I could be wrong but I think you will need to change out the torque convertor. . . Also, if you are not keeping them diesel and aren't interested in any of the diesel emblems, I would be interested in them. Let's see some pics! __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

03-18-2012, 12:05 AM	#5
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,260	Re: Olds 455 mate up to a '79 350 Diesel trans? I got a diesel 12 bolt at a junkyard. Was 2:73 was great with a 27" tire Posted via Mobile Device __________________ " That didnt make it any newer " " Dont antique the equipment "

03-18-2012, 12:14 AM	#6
86c20 Registered User Join Date: Mar 2012 Location: edgartown mass Posts: 852	Re: Olds 455 mate up to a '79 350 Diesel trans? you will have to change the tc as the stall will be low the rear end my be a hight gear then you think as some where 3.73 as the 5.7 are gutless. all so the 350 diesel is a good motor but got a bad rap for the injection pumps being junk. some poeple will buy them right up and all the parts to.

03-18-2012, 03:37 AM	#8
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: Olds 455 mate up to a '79 350 Diesel trans? My '74 C10 had a 12 bolt with 3:07 gears in it. Got great highway mileage and with the massive torque from the olds 455, I was more than capable of chasing down the occasional 'vette or camaro or 'stang all the while they're wondering what the he** I'm running.....A ROCKET ENGINE!!!!! LOL __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

03-18-2012, 06:49 AM	#9
3QTRTONS Registered User Join Date: Mar 2010 Location: Warren, ME. Posts: 235	Re: Olds 455 mate up to a '79 350 Diesel trans? So I'm looking to get another TC. Dunno s--t from green apples bout that (ANY 350 TC?), but I'm sure gonna see what the rear gear is first.... This is my first SWB & I wanna do it the right way....kinda like Jr Prom nite. I'll get pics in the flow... haven't paid the final $$$ yet... These 2 weren't on my radar. Hey Corts 60, you are 1st in line when the '79 Emblems go up 4 sale. The '85 that my son talked me out of is a Sierra Grande on the SPID, but has High Sierra Diesel fender emblems! Never seen em before; and he ain't givin em up! He's all excited - SWB that'll have "the look" AND can get 25mpg! The 350 Diesel stuff is going to be up 4 sale as soon as I pull the motor. The people that have those would love to get hold of some original parts for backup I'm sure. I really appreciate the feedback, keep it coming! Pix soon...... __________________ 1969 ES5500 B E A S T 1976 K20 Suburban 1983 C10 'farm truck' 1984 K10 Suburban 1988 V30 Fire Truck 1941 Dodge WC18 Ambulance 2000 GMC Bus (parts warehouse)

03-18-2012, 02:17 PM	#10
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: Olds 455 mate up to a '79 350 Diesel trans? Hey bud, I think you'll be happy to know that you have two T400's coming your way, not T350's. The T400 was the only tranny offered with the 5.7 during those years. And the axle (if original) will be one of three: 2.76, 3.08, or 3.40 __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold) Last edited by Corts60; 03-18-2012 at 02:29 PM.

03-18-2012, 07:59 PM	#11
3QTRTONS Registered User Join Date: Mar 2010 Location: Warren, ME. Posts: 235	Re: Olds 455 mate up to a '79 350 Diesel trans? Hey, I'm REAL happy to hear that! IMO, any of those rears would be great with my 455! And with a T400, I could haul about anything, INCLUDING a--!!! The '85 my son talked me out of is a 6.2 that starts & runs REAL GOOD! I'm wondering if I could use the running gear out of an '85 CUCV 4x4 Blazer for his? 3.08 front and rear, 700R4, can't remember what transfer case. Rest of the vehicle was a 2-to-make-1 deal, and I got the suspension/driveline. Oh, maybe should start this one in another thread..... not too savvy on protocol, yet..... Pix as I get em. __________________ 1969 ES5500 B E A S T 1976 K20 Suburban 1983 C10 'farm truck' 1984 K10 Suburban 1988 V30 Fire Truck 1941 Dodge WC18 Ambulance 2000 GMC Bus (parts warehouse)



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