'68 C30 Cummins swap - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

projectking · 07-02-2016, 08:45 PM

P.S. Don't knock me for the red accents that's how the dodge came.

j_cst_10 · 07-02-2016, 08:50 PM

Looks good, have you sorted out any of the clutch/transmission stuff yet?

projectking · 07-02-2016, 09:06 PM

Not yet, that's for tomorrow. I saved a piece of the clutch pedal and the piece that holds the slave to the firewall, I also want to get the throttle squared away.

j_cst_10 · 07-02-2016, 09:54 PM

For the throttle I used a dodge pedal and cable assembly than with some tinkering was able to use the chevy plastic pedal on the dodge bracket assembly to make it look original (the foot portion of the dodge pedal is much smaller)

projectking · 07-02-2016, 10:00 PM

I have the dodge pedal assembly that I plan to use with a special pedal. I took anything from the dodge that was different from the GM stuff just in case....

projectking · 07-02-2016, 10:03 PM

How tall is your fan blade? It looks to be smaller than mine and I'd like one that would be lower than the radiator, I read somewhere that the 6.2 Detroit blade will works too.

**Dieselwrencher** · 07-05-2016, 09:10 PM

Nice work on your truck!

projectking · 07-06-2016, 05:19 PM

Thanks Ryan, it's been a fun project for sure!

j_cst_10 · 07-07-2016, 04:16 PM

I have been driving my truck around unintentionally doing 1 wheeled burnouts all over town.

Not sure what you are using for a rear end but try and source a limited slip and a 3.55 gear set. I am using the factory C20 dana 60 open diff with 4.10's and it drives significantly worse than the dually it came out of with those gears.

projectking · 07-07-2016, 10:48 PM

I have the Dana 70 from the dodge that has 3:54's ? In it, when I drove the dodge around it was pretty nice thru the gears. The Eaton is still under the truck but isn't wide enough to clear the bed, I've been procrastinating because I'm not looking forward to cutting off the spring perches.

projectking · 08-06-2016, 12:36 PM

Well it's either been too hot or I've been too busy for the truck. Pulled the Eaton HO72 out and mocked up the Dana 70. Perches should be in by Tuesday so I'll have to wait to get it bolted in.

One problem I have is the wheel isn't centered in the opening and I'm unable to start the steel floor conversion until it's perfect.

**Dieselwrencher** · 08-08-2016, 07:30 PM

I had to move my perches back but at that time I switched over to 4wd hangers because they were taller than the 2wd ones.

GET_FOCUSED · 09-01-2016, 11:23 AM

I picked up a 69 c30 dually this past feb. Have been picking away at it when i have time 2 kids and a fulltime job tend to take most of that haha, im doing 5.9 12v intercooled cummins and rear four link on bags , ill be looking foward to see more added to this post as the build progresses and ill likely pick your brain as my build goes along!

projectking · 09-01-2016, 03:05 PM

Quote:

Originally Posted by GET_FOCUSED

I picked up a 69 c30 dually this past feb. Have been picking away at it when i have time 2 kids and a fulltime job tend to take most of that haha, im doing 5.9 12v intercooled cummins and rear four link on bags , ill be looking foward to see more added to this post as the build progresses and ill likely pick your brain as my build goes along!

Nice! It was originally my plan to 4 link and bag it but I'm afraid it won't be high enough for work. Are you planning a build thread for yours?

projectking · 09-04-2016, 03:23 PM

I was able to get the manual master out and start fitting the slave cylinder mounting bracket to the pedal assembly. I also did a test fit of the power brakes to see how the intake piping will need to be modified.

projectking · 09-26-2016, 07:33 AM

Got the slave cylinder installed

projectking · 09-26-2016, 09:33 AM

Got the slave cylinder installed

j_cst_10 · 09-26-2016, 09:40 AM

Looking good. You will have to make a new rod. I could probably measure mine to save you the hassle so your clutch actuation works right the first time.

projectking · 09-26-2016, 11:03 AM

Quote:

Originally Posted by j_cst_10

Looking good. You will have to make a new rod. I could probably measure mine to save you the hassle so your clutch actuation works right the first time.

That would be great, thanks.

Theboatandcarman · 10-01-2016, 09:57 PM

awesome build! everything is coming together nicely

projectking · 10-02-2016, 03:50 AM

Thanks, I just wish work wasn't so busy or I'd be driving it by now!

projectking · 10-09-2016, 07:53 PM

Did some digging and found this on a dodge forum:

The MINIMUM travel of the slave cylinder push rod needed to actuate the clutch properly is 23-24 MM.

projectking · 11-26-2016, 07:08 PM

By the time I get home from work there's roughly an hour of daylight left to work on it so it's been slow going.

During the past couple weeks I was able to get it wired, hook up the power steering hoses, and finish the piping. I used an old 6637 for mock up by cutting down the dodge intake tube and a piece of 4" exhaust pipe. The intercooler piping is in stock form on the passenger side and modified to clear the booster on the driver.

**Dieselwrencher** · 11-29-2016, 07:25 PM

Nice work on it. It's looking great.

OutlawM92 · 11-30-2016, 12:17 AM

Very nice! Can't wait to see her when she's finished!

07-02-2016, 08:45 PM	#51
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap P.S. Don't knock me for the red accents that's how the dodge came. __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

07-02-2016, 08:50 PM	#52
j_cst_10 Registered User Join Date: Nov 2008 Location: Cleveland, OH Posts: 592	Re: '68 C30 Cummins swap Looks good, have you sorted out any of the clutch/transmission stuff yet?

07-02-2016, 09:06 PM	#53
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap Not yet, that's for tomorrow. I saved a piece of the clutch pedal and the piece that holds the slave to the firewall, I also want to get the throttle squared away. __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

07-02-2016, 09:54 PM	#54
j_cst_10 Registered User Join Date: Nov 2008 Location: Cleveland, OH Posts: 592	Re: '68 C30 Cummins swap For the throttle I used a dodge pedal and cable assembly than with some tinkering was able to use the chevy plastic pedal on the dodge bracket assembly to make it look original (the foot portion of the dodge pedal is much smaller)

07-02-2016, 10:00 PM	#55
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap I have the dodge pedal assembly that I plan to use with a special pedal. I took anything from the dodge that was different from the GM stuff just in case.... __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

07-02-2016, 10:03 PM	#56
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap How tall is your fan blade? It looks to be smaller than mine and I'd like one that would be lower than the radiator, I read somewhere that the 6.2 Detroit blade will works too. __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

07-05-2016, 09:10 PM	#57
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,142	Re: '68 C30 Cummins swap Nice work on your truck! __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

07-06-2016, 05:19 PM	#58
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap Thanks Ryan, it's been a fun project for sure! __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

07-07-2016, 04:16 PM	#59
j_cst_10 Registered User Join Date: Nov 2008 Location: Cleveland, OH Posts: 592	Re: '68 C30 Cummins swap I have been driving my truck around unintentionally doing 1 wheeled burnouts all over town. Not sure what you are using for a rear end but try and source a limited slip and a 3.55 gear set. I am using the factory C20 dana 60 open diff with 4.10's and it drives significantly worse than the dually it came out of with those gears.

07-07-2016, 10:48 PM	#60
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap I have the Dana 70 from the dodge that has 3:54's ? In it, when I drove the dodge around it was pretty nice thru the gears. The Eaton is still under the truck but isn't wide enough to clear the bed, I've been procrastinating because I'm not looking forward to cutting off the spring perches. __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

08-06-2016, 12:36 PM	#61
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap Well it's either been too hot or I've been too busy for the truck. Pulled the Eaton HO72 out and mocked up the Dana 70. Perches should be in by Tuesday so I'll have to wait to get it bolted in. One problem I have is the wheel isn't centered in the opening and I'm unable to start the steel floor conversion until it's perfect. __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

08-08-2016, 07:30 PM	#62
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,142	Re: '68 C30 Cummins swap I had to move my perches back but at that time I switched over to 4wd hangers because they were taller than the 2wd ones. __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

09-01-2016, 11:23 AM	#63
GET_FOCUSED Registered User Join Date: Sep 2016 Location: HALIFAX NOVA SCOTIA Posts: 5	Re: '68 C30 Cummins swap I picked up a 69 c30 dually this past feb. Have been picking away at it when i have time 2 kids and a fulltime job tend to take most of that haha, im doing 5.9 12v intercooled cummins and rear four link on bags , ill be looking foward to see more added to this post as the build progresses and ill likely pick your brain as my build goes along!

09-04-2016, 03:23 PM	#65
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap I was able to get the manual master out and start fitting the slave cylinder mounting bracket to the pedal assembly. I also did a test fit of the power brakes to see how the intake piping will need to be modified. __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

09-26-2016, 07:33 AM	#66
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap Got the slave cylinder installed __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback



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09-26-2016, 09:33 AM	#67
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap Got the slave cylinder installed __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

09-26-2016, 09:40 AM	#68
j_cst_10 Registered User Join Date: Nov 2008 Location: Cleveland, OH Posts: 592	Re: '68 C30 Cummins swap Looking good. You will have to make a new rod. I could probably measure mine to save you the hassle so your clutch actuation works right the first time.

10-01-2016, 09:57 PM	#70
Theboatandcarman Registered User Join Date: Aug 2015 Location: Harleysville, PA Posts: 398	Re: '68 C30 Cummins swap awesome build! everything is coming together nicely

10-02-2016, 03:50 AM	#71
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap Thanks, I just wish work wasn't so busy or I'd be driving it by now! __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

10-09-2016, 07:53 PM	#72
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap Did some digging and found this on a dodge forum: The MINIMUM travel of the slave cylinder push rod needed to actuate the clutch properly is 23-24 MM. __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback Last edited by projectking; 10-09-2016 at 10:40 PM.

11-26-2016, 07:08 PM	#73
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: '68 C30 Cummins swap By the time I get home from work there's roughly an hour of daylight left to work on it so it's been slow going. During the past couple weeks I was able to get it wired, hook up the power steering hoses, and finish the piping. I used an old 6637 for mock up by cutting down the dodge intake tube and a piece of 4" exhaust pipe. The intercooler piping is in stock form on the passenger side and modified to clear the booster on the driver. __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback Last edited by projectking; 11-26-2016 at 11:05 PM.

11-29-2016, 07:25 PM	#74
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,142	Re: '68 C30 Cummins swap Nice work on it. It's looking great. __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

11-30-2016, 12:17 AM	#75
OutlawM92 Registered User Join Date: Aug 2013 Location: Clinton, IA Posts: 321	Re: '68 C30 Cummins swap Very nice! Can't wait to see her when she's finished! __________________ 1969 C10 "Problem Child" 1981 C20 CCLB "Nightrain" "A good plan violently executed right now is far better than a perfect plan executed next week. Accept the challenges, so that you may feel the exhilaration of victory."

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