Diesel Bombers
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Diesel Bombers (https://www.dieselbombers.com/)
-   Diesel Engine Conversions (https://www.dieselbombers.com/diesel-engine-conversions/)
-   -   1978 Bronco + 1991 Cummins 6BT (https://www.dieselbombers.com/diesel-engine-conversions/59429-1978-bronco-1991-cummins-6bt.html)

hagerty_justin 09-21-2011 04:47 PM
Dang, I'm doing the swap into my 75 f250 with 44 front 60 rear.. with 4.11s.... :humm: i wonder what my top speed will be?

cummins bronco 09-21-2011 06:08 PM
well mine hasn't faired too well!
first time out wheeling and i managed to break both axles!
oops, guess thats what you get for too much torque, a locker, ceramic clutch and 35s in a hole.
good thing i have a Dana 60 waiting to go in.

American Thunder 09-21-2011 06:33 PM
Originally Posted by hagerty_justin (Post 801368)
Dang, I'm doing the swap into my 75 f250 with 44 front 60 rear.. with 4.11s.... :humm: i wonder what my top speed will be?
With 35s on it, assuming a 1:1 trans ratio, you'll cruise at 60mph at 2400 rpm, and top out at 80mph at 3200 rpm. I think?

93_Fummins 09-22-2011 08:16 AM
Originally Posted by American Thunder (Post 801356)
So far so good, but I rarely beat it up. If I was doing serious pulling with it, I'm sure the 44 would have issues.. My biggest complaint with the reverse cut gears in the 44 is the non-availability of gears such as 3.00s.. The 3.50s that are in it are alright, but the motor surely doesn't need any help moving this truck, and I could get better fuel mileage with 3.00s. Oh well.
I have a 1979 Bronco "California Edition" that had 3.00's front and rear in it (D44 and 9-inch)...unless I counted wrong :humm:

hagerty_justin 09-22-2011 12:18 PM
Originally Posted by cummins bronco (Post 801406)
well mine hasn't faired too well!
first time out wheeling and i managed to break both axles!
oops, guess thats what you get for too much torque, a locker, ceramic clutch and 35s in a hole.
good thing i have a Dana 60 waiting to go in.
Cummins Bronco, what axles did you break? A 44 and a 9?

---AutoMerged DoublePost---

Originally Posted by American Thunder (Post 801417)
With 35s on it, assuming a 1:1 trans ratio, you'll cruise at 60mph at 2400 rpm, and top out at 80mph at 3200 rpm. I think?
I think a Geatrag 360 is .77:1 in 5th gear, so I should be fine. Hopefully I don't need to go with taller gears, like 4.88s or something

cummins bronco 09-22-2011 06:09 PM
i broke both the axles in the dana 44 front:argh:

i definately wouldn't go lower than 4.11s thats what i had in my bronco and switched to 3.55s with a ZF-5.

i have a sterling 10.25 in the back, i don't think i could break that thing if i tried, although the factory posi bit the dust.

BIGBILL105 45 10-02-2011 09:55 PM
Should of put a hood stack on that thing.

andrewmp6 11-17-2011 07:43 AM
What kinda mileage you getting with out a overdrive?

American Thunder 11-17-2011 11:02 AM
I average 18-20 mpg

andrewmp6 11-18-2011 05:19 AM
That's about what i was have have heard out of most cummins swaps even in a crew cab one ton.


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