Upgrading a 4X4 C4 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 6 (permalink) Old 02-20-2006, 02:20 PM Thread Starter
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Upgrading a 4X4 C4

I have an Early Bronco with a fresh 393W. I currently run a NP435 granny 4spd, but have a C4 that I'm wanting to build and swap in. The C4 is an early Bronco model out of my 77 parts rig. I want to build a stout tranny that can live at low speeds on the trail and take 400 ft/lbs of torque. What mods are recommended?
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post #2 of 6 (permalink) Old 02-20-2006, 02:21 PM Thread Starter
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Upgrading a 4X4 C4



'72 Bronco Explorer, 393W, C4, Dana 20, 4.56's, Locked, 36x13.50 Iroks, Hydroboost 4 wheel disks,...
'78 F250 4x4, 400, NP435, resto in progress...
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post #3 of 6 (permalink) Old 02-20-2006, 03:36 PM
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Upgrading a 4X4 C4

Usually Bronces are heavier than cars and use bigger tires. Along with being 4x4 that adds load to the trans. The Bronco C4 is a good trans. Usually they already have "H" or "R" servos. I would recommend you add a clutch to the direct drum and keep the clearence to a minimum. Use a GOOD valve body to keep the pressure up along with a good cooler.

Grabber Green \'70 Mach I 351C 4V 12.32 at 111mph 1.63 60ft. time
Robin Egg Blue \'79 Fairmont 408C 4V 10.50 at 127mph 1.38 60ft. time
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post #4 of 6 (permalink) Old 02-21-2006, 05:48 PM Thread Starter
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Upgrading a 4X4 C4

I finished pulling it apart this evening. I found a hardened 26/24 spline shaft, "H" servo, 5 foward clutches, and a wasted set of high/reverse clutches. Wasted to the point that there was no friction material on any of the clutches and the piston had overtraveled and wedged itself sideways. Talk about a pain in the butt to get the spring retainer off and piston out.

I'm thinking of using Alto clutches. I plan on adding one disk to the high/rev and may add an extra to the foward. Should I swap both bands to Kevlar or just the intermediate? I also plan on using the BURLY4X4.com valve body mods, drilling the high/rev drum, and removing the check balls from the stator. Any other suggestions?

I think I should have a pretty stout little tranny when I'm finished.

'72 Bronco Explorer, 393W, C4, Dana 20, 4.56's, Locked, 36x13.50 Iroks, Hydroboost 4 wheel disks,...
'78 F250 4x4, 400, NP435, resto in progress...
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post #5 of 6 (permalink) Old 02-22-2006, 04:03 PM
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Upgrading a 4X4 C4

That goes to show you that the direct drum needs help. It's always the first to go.

I really don't have a strong opinion on running Kevlar band on the rev drum. I have never had one fail. One good thing is kevlar bands are as cheap as conventional bands, so for the cost, why not.

Grabber Green \'70 Mach I 351C 4V 12.32 at 111mph 1.63 60ft. time
Robin Egg Blue \'79 Fairmont 408C 4V 10.50 at 127mph 1.38 60ft. time
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post #6 of 6 (permalink) Old 02-23-2006, 04:50 AM Thread Starter
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Upgrading a 4X4 C4

I ran a Kevlar on the rev in the last tranny I built with a brake. But as you said cheap insurance.

'72 Bronco Explorer, 393W, C4, Dana 20, 4.56's, Locked, 36x13.50 Iroks, Hydroboost 4 wheel disks,...
'78 F250 4x4, 400, NP435, resto in progress...
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