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1978 Bronco + 1991 Cummins 6BT

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  #21  
Old 09-21-2011, 04:47 PM
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Dang, I'm doing the swap into my 75 f250 with 44 front 60 rear.. with 4.11s.... i wonder what my top speed will be?
 
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  #22  
Old 09-21-2011, 06:08 PM
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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.
 
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  #23  
Old 09-21-2011, 06:33 PM
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Originally Posted by hagerty_justin
Dang, I'm doing the swap into my 75 f250 with 44 front 60 rear.. with 4.11s.... 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?
 
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  #24  
Old 09-22-2011, 08:16 AM
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Originally Posted by American Thunder
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
 
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  #25  
Old 09-22-2011, 12:18 PM
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Originally Posted by cummins bronco
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
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
 
Last edited by hagerty_justin; 09-22-2011 at 12:18 PM. Reason: Automerged Doublepost
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  #26  
Old 09-22-2011, 06:09 PM
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i broke both the axles in the dana 44 front

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.
 
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  #27  
Old 10-02-2011, 09:55 PM
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Should of put a hood stack on that thing.
 
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  #28  
Old 11-17-2011, 07:43 AM
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What kinda mileage you getting with out a overdrive?
 
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  #29  
Old 11-17-2011, 11:02 AM
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I average 18-20 mpg
 
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  #30  
Old 11-18-2011, 05:19 AM
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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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