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View Poll Results: C6 vs 4 spd 78 bronco with a 400
C6 8 44.44%
4 spd 10 55.56%
Voters: 18. You may not vote on this poll

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Old 11-25-2012, 12:20 AM   #1
tylerb
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Bronco Info: 1978 BRONCO xlt 400cI 4" lift 33" tires
C6 to 4 spd swap

Currently have a 1978 bronco with a 400. have a c6 for the tranny and want to throw in a 4 spd i got from a 78 bronco parts truck. Wondering what i should look at or replace before i do the swap. replacement part brands would be nice
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Old 11-25-2012, 12:45 AM   #2
Ewgoetz
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Bronco Info: 1996 EB Bronco 5.8, E4OD, BW1356 Transfercase, 6 inch BDS Lift w/Procomp Leafs, 200,010Miles
This a dd or a weekend rig?
Dd than the c6.
Weekend than maybe the 4 spd
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Old 11-25-2012, 12:55 AM   #3
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Bronco Info: '89 Bronco XLT. Front clip swap. 351 w/ C6. 4" lift. 33x10.5x15 BFG Mud Terrains
I'd think it'd be the opposite. C6 gets pitiful mpg (yes yes we drive Broncos....but gas mileage is always a plus)
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Old 11-25-2012, 01:07 AM   #4
tylerb
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Bronco Info: 1978 BRONCO xlt 400cI 4" lift 33" tires
Its a daily driver but I dnt mind shifting gears. Plus tht low front gear wld be fun on the weekends. also hoping to raise my mpg up a little from 8. The truck seems to have a slow reaction to it. Thinking its the tranny I've spent hours messing with the distributor and carb with no luck
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Old 11-25-2012, 09:09 AM   #5
Ewgoetz
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Sounds like you already know your decision.
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Old 11-25-2012, 11:33 AM   #6
tylerb
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Bronco Info: 1978 BRONCO xlt 400cI 4" lift 33" tires
I want to do the swap I jst want to know what to look at or replace before I do it
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Old 11-25-2012, 12:07 PM   #7
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Bronco Info: 79 EFI460,T18,ORD Doubler,Lincoln locked Sterling rear, Coil sprung D60 front, 4" lift on 37s
Do you have a complete donor vehicle to rob the stuff off or do you just have a transmission.
You will need the pedals, linkage, belcrank, bellhousing, release fork etc.

As far as what to replace, I would replace the clutch friction disc, pressure plate, pilot bearing and throwout bearing.
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Old 11-25-2012, 12:13 PM   #8
tylerb
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Bronco Info: 1978 BRONCO xlt 400cI 4" lift 33" tires
I took out every thing I need out of a parts truck
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Old 11-25-2012, 07:05 PM   #9
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Bronco Info: 79 EFI460,T18,ORD Doubler,Lincoln locked Sterling rear, Coil sprung D60 front, 4" lift on 37s
The nylon bushings on the bellcrank are replaceable as are the felt washers, also the nylon bushings on the ends of the clutch linkage rod. I also drilled and installed a grease zerk fitting on the bellcrank. None of these things are critical but it will make the clutch action smoother.
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Old 11-25-2012, 07:05 PM   #10
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Bronco Info: 1979 bronco,351m C6 np 205,
I did the opposite on my '79.
I went from a 4 speed manual to a C6.

I miss the super low first gear from time to time.
I lost a bit on mileage as well, the C6 costs more in gas but I gained in ease of use...hit the gas and away you go.

If you have a parts trucks, you can do the conversion
You will have to take everything from the drive shaft on.

everything will bolt on, the holes are already there in the floor for the clutch rod.

marc
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Old 11-25-2012, 07:37 PM   #11
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4spd better mpg and more fun
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Old 11-25-2012, 10:49 PM   #12
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I am going c-6 with mine in the spring.
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Old 11-25-2012, 11:03 PM   #13
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My DD is a stick shift and I don't mind it till I get into traffic and I get tired of holding the clutch in or I have to stop on a hill and some ding dong is on my butt. My 79' has a C6 and I'm happy with the automatic, even nicer when I'm off road, just put it in 1st gear and away I go. Friends have manuals in their vehicles and hate all the shifting they have to do when we're out wheelin' around. I'll sacrifice the MPG for less dancing with 3 pedals.
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Old 11-26-2012, 12:39 AM   #14
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Originally Posted by Ziggy View Post
My DD is a stick shift and I don't mind it till I get into traffic and I get tired of holding the clutch in or I have to stop on a hill and some ding dong is on my butt. My 79' has a C6 and I'm happy with the automatic, even nicer when I'm off road, just put it in 1st gear and away I go. Friends have manuals in their vehicles and hate all the shifting they have to do when we're out wheelin' around. I'll sacrifice the MPG for less dancing with 3 pedals.
I'm with you. My 5-speed F250 is a pain to drive around hilly Seattle, especially in traffic.
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Old 12-02-2012, 03:50 PM   #15
tylerb
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Bronco Info: 1978 BRONCO xlt 400cI 4" lift 33" tires
Am I better off buying a performance clutch kit or are the ones from orielys or Autozone decent
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Old 12-02-2012, 04:21 PM   #16
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i drove stick for years and there are times im glad my bronco is auto. wish i had a 4spd auto but like many admit c6 is one hell of a tranny. If you are just driving it like a sane man then get the heavy duty from a reputable company. If you need more then spend more. Only you will know how you will drive it.
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Old 12-02-2012, 06:00 PM   #17
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Quote:
Originally Posted by f150inline View Post
4spd better mpg and more fun
X2.....it's not bad in traffic,if you had a bad knee or something...I can see the dislike of the clutch.

Sent from my XT603
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