The Cummins Bronco - Page 12 - Ford Bronco Forum
 4Likes
Reply
 
LinkBack Thread Tools Display Modes
post #221 of 235 (permalink) Old 04-05-2016, 07:25 PM Thread Starter
Registered User
 
American Thunder's Avatar
 
Join Date: Aug 2010
Location: Ulster County, New York
Posts: 360
Bronco Info: 1978 Cummins Bronco
iTrader: (0)
I upgraded the front calipers with pieces from a 1975 full size passenger car (aka "Thunderbird calipers") with the larger pistons, the calipers have a lot more clamping force than the stock units. Stock rotors and pads work with the bigger piston calipers, too. I did have to modify the hoses to work with the calipers, but not a big deal. I drilled out the stock banjo fitting slightly larger, and used larger banjo bolts that fit the calipers. (the thunderbird calipers normally use hoses that thread right into them, not banjo bolts and fittings, but there is clearance issues with that if used on the Bronco) Some very careful grinding was needed on each caliper to clear the banjo fittings as well.
I had already upgraded the master cylinder and brake booster, and rear wheel cylinders with larger F350 parts, so the addition of the larger piston calipers completed the brake upgrade. It can lock up the 37s on dry pavement now. Not surprising, since the vacuum pump on the diesel sends 27" of vac to the F350 brake booster. I'm very happy with how the brakes work now.
Attached Thumbnails
Click image for larger version

Name:	New-1.jpg
Views:	79
Size:	186.7 KB
ID:	78762   Click image for larger version

Name:	New-2.jpg
Views:	78
Size:	293.5 KB
ID:	78770  
Sloride75 and huck2080 like this.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
American Thunder is offline  
Sponsored Links
Advertisement
 
post #222 of 235 (permalink) Old 04-06-2016, 02:16 AM
Registered User
 
Join Date: Dec 2010
Location: Oregon
Posts: 35
Bronco Info: 1979 Bronco C6w/wide ratio & Twin Sticks
iTrader: (0)
how many miles do have on the conversion now? how has the C6 been holding up?
EB79Bronco is offline  
post #223 of 235 (permalink) Old 04-06-2016, 01:00 PM Thread Starter
Registered User
 
American Thunder's Avatar
 
Join Date: Aug 2010
Location: Ulster County, New York
Posts: 360
Bronco Info: 1978 Cummins Bronco
iTrader: (0)
Quote:
Originally Posted by EB79Bronco View Post
how many miles do have on the conversion now? how has the C6 been holding up?
About 40k miles. The C6 is great. The torque of the Cummins twisted off the first few driveshafts I had in it, too. lol Dynamic Racing builds some very solid transmissions.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
American Thunder is offline  
 
post #224 of 235 (permalink) Old 04-06-2016, 10:45 PM
Registered User
 
Join Date: Dec 2010
Location: Oregon
Posts: 35
Bronco Info: 1979 Bronco C6w/wide ratio & Twin Sticks
iTrader: (0)
That's awesome to hear that your C6 is doing well....gives me some hope for my build.

you mentioned snapping drive-shafts, what did you finally settle on that kept the cummins from
breaking them?
EB79Bronco is offline  
post #225 of 235 (permalink) Old 04-11-2016, 09:15 PM Thread Starter
Registered User
 
American Thunder's Avatar
 
Join Date: Aug 2010
Location: Ulster County, New York
Posts: 360
Bronco Info: 1978 Cummins Bronco
iTrader: (0)
Quote:
Originally Posted by EB79Bronco View Post
That's awesome to hear that your C6 is doing well....gives me some hope for my build.

you mentioned snapping drive-shafts, what did you finally settle on that kept the cummins from
breaking them?
Tom Woods built it. His creation is as solid as the Dynamic transmission. He uses premium materials and has outstanding workmanship, and he upgraded the u-joints, including the CV with 1350s. I wanted 1410s in it, because of the steep angle it runs, but he said they don't offer a CV that big. However skeptical I was, those 1350s have held up under grueling conditions for almost 40k miles.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
American Thunder is offline  
post #226 of 235 (permalink) Old 04-11-2016, 09:21 PM Thread Starter
Registered User
 
American Thunder's Avatar
 
Join Date: Aug 2010
Location: Ulster County, New York
Posts: 360
Bronco Info: 1978 Cummins Bronco
iTrader: (0)
This is my toy, but it's also a daily driven family vehicle.
Attached Thumbnails
Click image for larger version

Name:	Dan and P and Bronco 3.jpg
Views:	64
Size:	390.8 KB
ID:	79402  

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
American Thunder is offline  
post #227 of 235 (permalink) Old 04-11-2016, 09:28 PM Thread Starter
Registered User
 
American Thunder's Avatar
 
Join Date: Aug 2010
Location: Ulster County, New York
Posts: 360
Bronco Info: 1978 Cummins Bronco
iTrader: (0)
This is my favorite picture of my truck. My son took it. Bright Chevy orange tow hooks donated from an F800 clearly visible. The only things on my truck you will ever see that are that color.. for towing chevys. lol
Attached Thumbnails
Click image for larger version

Name:	Bronco mud.jpg
Views:	86
Size:	137.0 KB
ID:	79410  

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
American Thunder is offline  
post #228 of 235 (permalink) Old 04-11-2016, 09:36 PM Thread Starter
Registered User
 
American Thunder's Avatar
 
Join Date: Aug 2010
Location: Ulster County, New York
Posts: 360
Bronco Info: 1978 Cummins Bronco
iTrader: (0)
I just had the original windshield replaced last summer. WOW what a difference it made.. It's like going from an old blurry TV from the early 80s to a new 4K HD flat screen. lol
huck2080 likes this.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
American Thunder is offline  
post #229 of 235 (permalink) Old 04-13-2016, 03:00 AM
Registered User
 
Join Date: Dec 2010
Location: Oregon
Posts: 35
Bronco Info: 1979 Bronco C6w/wide ratio & Twin Sticks
iTrader: (0)
Ha ha.. I like chevy orange tow hooks too. Also like the pic of you and your son sitting on the hood!

I tell ya these swaps are time consuming, I'm just ready to get it done. But I still need exhaust, intercooler, radiator, and VRV valve installed. At the rate
I'm going its still probably a few months away.

I got to ask how the heck did you fit 4" exhaust.? I'm looking at my Turbo outlet and it is a bit tight by the firewall and bellhousing....and I'm using a small bell C6.
EB79Bronco is offline  
post #230 of 235 (permalink) Old 04-14-2016, 03:29 PM Thread Starter
Registered User
 
American Thunder's Avatar
 
Join Date: Aug 2010
Location: Ulster County, New York
Posts: 360
Bronco Info: 1978 Cummins Bronco
iTrader: (0)
Quote:
Originally Posted by EB79Bronco View Post
Ha ha.. I like chevy orange tow hooks too. Also like the pic of you and your son sitting on the hood!

I tell ya these swaps are time consuming, I'm just ready to get it done. But I still need exhaust, intercooler, radiator, and VRV valve installed. At the rate
I'm going its still probably a few months away.

I got to ask how the heck did you fit 4" exhaust.? I'm looking at my Turbo outlet and it is a bit tight by the firewall and bellhousing....and I'm using a small bell C6.
I also have my whole drivetrain moved back 4" in the chassis, to reduce the nose weight, so the downpipe is fairly close to the firewall, but mine is still stock 3" pipe from the turbo, then goes into 4" exhaust. I ran the downpipe outside the frame, and the exhaust is hung under the passenger rocker. One day I will fab up a 4" downpipe from stainless and polish the hell out of it, since it's visible from the outside.
Attached Thumbnails
Click image for larger version

Name:	New-1.jpg
Views:	58
Size:	132.6 KB
ID:	79714  

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
American Thunder is offline  
post #231 of 235 (permalink) Old 04-14-2016, 10:35 PM
Registered User
 
laserfish's Avatar
 
Join Date: Feb 2016
Location: Fort Worth, TX
Posts: 87
Bronco Info: 1973 Bronco Ranger, 1990 Eddie Bauer, bone stock with a 5.8 auto
iTrader: (0)
When I purchased my 90 a few months ago, it came with a 6bt 12v disassembled in the back. PO thought he was going to do a project like yours. Thought has crossed my mind. Had the kdp in it, but i cannot find the damage like yours had on the first page. Love the write up. What is an engine like that worth? Might make a difference to me whether or not to take on this project.
laserfish is offline  
post #232 of 235 (permalink) Old 04-15-2016, 12:13 AM
Registered User
 
Join Date: Dec 2010
Location: Oregon
Posts: 35
Bronco Info: 1979 Bronco C6w/wide ratio & Twin Sticks
iTrader: (0)
I see. yeah moving the drivetrain back 4" would make an already difficult situation even more challenging. I've been thinking about that option as well (running out side the frame). I'd prefer to keep it inside the frame but all options are on the table right now. btw.. Do you even have any room to dump the exhaust down inside the frame rail (on passenger side)?

I bet that exhaust is pretty loud for you, but especially loud as you pass by prius drivers. They must hate it when dump black smoke in their ear.
EB79Bronco is offline  
post #233 of 235 (permalink) Old 10-06-2016, 05:19 PM
Registered User
 
Join Date: Oct 2016
Location: Gales Ferry, CT
Posts: 1
iTrader: (0)
Sir, thank you for the information in this thread. I have a half torn down 77 Highboy F-250 that I am slowly working on putting a pieced together 5.9 into. You are the only one with actual numbers regarding the C6 as a transmission, so I also thank you for that. It turns out finding a 2wd trans for a straight Cummins swap is almost impossible up here in the northeast and especially one that doesn't cost an arm and a leg. So, it has kinda made me more than fully consider keeping the C6 that I have and just make it work. Apparently Cummins stuff is gold up here. Anyways, I also thank you for the motor mount dimensions.

I do have a few questions if you don't mind me asking. I don't think I saw it, but what made you want to keep the C6 and not go with something that was originally mated to the Cummins like a 727, 47RH, or 47RE? Regarding the C6, have you thought about putting a set of E4OD gears in it, it would probably help if you ever go with the higher gear ratio? Plus, E4ODs can be picked up for cheap as I got one for $50 that I plan on taking the gears out of to put in mine, should I finally decide to keep the C6. Also, have you looked for used Laycock/Gear Vendors overdrive units? I am sure I have loads more to ask, but I don't want to be a bother.
michael.kitko is offline  
post #234 of 235 (permalink) Old 02-09-2017, 02:40 PM
Registered User
 
wheelin'78's Avatar
 
Join Date: Jul 2015
Location: Palisade, Co
Posts: 543
Bronco Info: 78 Bronco Ranger XLT, rebuilt 400ci bored .04 over, 4" lift currently running 33's.
iTrader: (0)
Old thread I know...but damn, that's just bad! Nice work if your still on here man!

'78 Ranger XLT, Line-X Coated, 400ci bored .040 over, Weiand 4 Barrel Intake, Holley 4160 600 CFM Carb, forged flat top pistons, 262/268 Isky Cam, Roller Rockers, 3G Alt w/dual belts, HEI Ignition, independent dual battery set up, 4.56 Gears w/rear Detroit Locker, C6 with shift kit.
wheelin'78 is offline  
post #235 of 235 (permalink) Old 02-13-2017, 06:05 PM
Registered User
 
marshallnoise's Avatar
 
Join Date: Jun 2016
Location: Oceanside
Posts: 259
Bronco Info: '79 Custom
iTrader: (0)
Not a month goes by without me looking at this thread.

1995 BMW 540i
'79 SHTF Daily Build
1997 Toyota 4Runner (locked)
marshallnoise is online now  
Reply

  Ford Bronco Forum > Bronco Discussions > 1978-'79 Bronco Tech

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Bronco Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself. DO NOT USE Gmail.com accounts. If you only have a Gmail.com email please contact the administrator here

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome