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Go Back   ClassicBroncos.com Forums > 66-77 Ford Bronco > Bronco FAQ > Transmission FAQ's

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Popular Transmissions To Swap into an Early Bronco Popular Transmissions To Swap into an Early Bronco
This is a brief overview of popular tranny swaps
DebosDave'72
07/19/06
This FAQ will help answer your question as to what transmissions are available to swap into my Early Bronco?

First we will look at Manual Transmissions:

NV3550
- This is a 5-speed overdrive transmission that provides a sporty feel. Needs to be adapted to the stock transfercase and the engine. Has a decently low but driveable first gear.

NV4500
- This is a 5-speed overdrive transmission that is very heavy duty. Needs to be adapted to the stock transfercase and the engine. Has granny low. Truck feel to the shifting, but bulletproof in Early Bronco applications.

Ford ZF
- This is a 5-speed, overdrive transmission that is very heavy duty. Needs to be adapted to the stock transfercase. Has granny low gear, and a truck like shiting feel. Bulletproof and a FORD product!

Borg Warner T-18
- This is a 4-speed heavy duty truck transmission. Needs to be adapted to the stock transfercase. Has a low first gear.

NP435
- This is a 4-speed heavy duty transmission. Needs to be adapted to the stock transfercase. Has a granny low first gear.

TopLoader
- This transmission was available with three different gear sets. It is 4-speed, but can have overdrive and granny low. Needs to be modified to bolt to the stock transfercase

T5
- This transmission is a 5-speed sports car transmission. Provides overdrive, but not heavy duty. Needs to be adapted to the transfercase.

For more information on Manual Transmission swaps into the Early Bronco follow this link:
Manual Transmission Swap Info

Next a look at popular Automatic Transmissions

AOD
- This transmission provides an overdrive. It is a 4-speed automatic. Needs to be adapted to the stock transfercase.

AODE/4R70W
- This transmission allows for overdrive. It is a 4-speed automatic. The difference between the two is the gear sets, with the 4R70W having a slightly lower gearing in the first two gears. Both need to be controlled by a computer. Needs to be adapted to the stock transfercase.

C6
- This transmission is a 3-speed. This is a very heavy duty transmission, considered bulletproof in Early Bronco applications. Needs to be adapted to the stock transfercase.

C4
- This transmission is a 3-speed automatic. It can be found in Early Broncos from the factory. They need to be adapted to the stock transfercase. If you can find one in an Early Bronco, make sure to get the adapter.

700R4
- This transmission is a 4-speed with overdrive. Needs to be adapted to the engine and the stock transfercase. Can be built very strong.

If you would like more information on Popular Automatic Transmission swaps please follow this link:
Automatic Transmission Swap Info

Gear Ratio Chart:


Thanks for looking, I hope this helps a little!

If you can add anything to this FAQ, please respond below:  

Last edited by admin; 08/14/06 at 01:50 PM.. Reason: added gear ratio chart
  #15  
landshark99 on 08/04/14, 06:07 AM
The zf behind a 460 is indeed an external hydraulic clutch setup. You would have to fab up a pivot point for a small block zf and a bracket for the external slave.
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  #16  
jimc351 on 08/26/15, 06:40 AM
Transmissions

Your information is very helpful, thank you. Do you know of or where there might be information of the performance reviews of each transmission. I just bought my first Bronco restore project, I now have three motors 302, 5.0, and a 351. The trans in it is a three on tree. I am not a rock climber, I want good roadability, towing, and offroad use for fishing. Nothing mountainous. Would prefer 4 or 5 speed, but AOD is ok too.


Thanks

Jimc351
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  #17  
DavidDolezilek on 11/25/15, 09:12 AM
Me too

Jimc

I am trying to do the same as you. I was curious if you received any information about auto transmissions to make a daily driver

Thanks

DavidDolezilek
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  #18  
Joe473 on 11/25/15, 03:51 PM
Quote:
Originally Posted by ahansen_1985 View Post
The Mazda unit is called the m5od-r2
Found in late 80? To 90's f150s

It has a lil taller 1st gear ratio than the zf.. But shifts super smooth and fast... Will hold up to a 350 hp 351 no prob... I run mine hard...
The difference as a bronco brother put it,
The zf is a truck feel trans, the m5od is a go cart on steroids

Clutch is internal hydraulic but very easy to install...


1966 bronco, almost nothing factory
Anybody out there knowledgable enough on the M5R2 to modify original tech? Things like overall length as compared to 3 spd? Ratio's? Zf d20 adapter and crosmember compatibilty?
Best years for shifter locations? Does 4.2 v6 bellhousing match 402? Compatible master cylinder and clutch pedal mod? NP 205 compatibility and benefits.

These transmissions seem easier to find than 3550 and similar torque ratings from what I have read.
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  #19  
egom on 04/23/16, 11:22 AM
zf swap info

yes but there was an article on how to install a ZF into a 302 using spud shaft form the zf and adapter from the D20 by welding them together wher can I find it appriciate any info. this article was had easy step by step instructions.
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