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Old 10-05-2005, 03:22 PM
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Ford C-6 Transmission swap Question

I currantly have a 1989 for bronco with a 351w and a c6 trans, the trans is going out and i wanted to know if the transmission from another bronco (same year) with a 302 will bolt up... 302 trans to 351 engine

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Old 10-05-2005, 03:46 PM
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yes it will bolt up, however if it is not also a c6 I would try to get all the add on's like linkages , possibly drive shafts etc if it is an aod or other trans, if it is a c6 should drop right in.
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Old 10-06-2005, 03:53 PM
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Another C-6 will fit. If you switch to the C4 or an AOD you will need a shorter driveshaft and have to reposition the trans cross bar.

Also the C-6's are pretty easy to rebuild, and the kits are cheap... you could do a rebuild on it for probably under 150$ as long as you dont need any hard parts.

My all time favorate trans is the FMX as they can be rebuilt with the transmission still in the car, they dont seem to last as long under race conditions, probably because they use the same clutches as an AOD.
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Old 10-07-2005, 02:26 AM
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Quote:
Originally Posted by brainsboy
Another C-6 will fit. If you switch to the C4 or an AOD you will need a shorter driveshaft and have to reposition the trans cross bar.

Also the C-6's are pretty easy to rebuild, and the kits are cheap... you could do a rebuild on it for probably under 150$ as long as you dont need any hard parts.

My all time favorate trans is the FMX as they can be rebuilt with the transmission still in the car, they dont seem to last as long under race conditions, probably because they use the same clutches as an AOD.
****************
302s and 351W are 28 oz balance..... 5.0s are 50 oz. balance.....

If it is an 89 model it is not a 302, it is a 5.0... and your balance is wrong.

You better be sure that trans has the same balance torque converter, or else.

AOD/ driveshaft......it depends on where the trans comes from...
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Old 10-07-2005, 07:25 AM
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Quote:
Originally Posted by xntrik
****************
302s and 351W are 28 oz balance..... 5.0s are 50 oz. balance.....

If it is an 89 model it is not a 302, it is a 5.0... and your balance is wrong.

You better be sure that trans has the same balance torque converter, or else.

AOD/ driveshaft......it depends on where the trans comes from...

100% WRONG! Fords are balanced on the Flexplate not the torque converter.


I did mis-type one thing, All AOD's are shorter then C-6's, so you end up needing a longer driveshaft not shorter

Last edited by brainsboy; 10-07-2005 at 07:31 AM.
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Old 10-08-2005, 11:49 AM
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Quote:
Originally Posted by brainsboy
100% WRONG! Fords are balanced on the Flexplate not the torque converter.

I did mis-type one thing, All AOD's are shorter then C-6's, so you end up needing a longer driveshaft not shorter

NO ITS NOT 100 % WRONG, the balance still comes from that assembly. AODs and C-6s take different flexplates.

But it is OK for YOU to type something in error.

Even though you say your iniformation that you gave was totally opposite.
I forgive you.
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Old 10-10-2005, 10:11 AM
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There are only 2 flexplates 157tooth and 164tooth, the C-4 has a removable bell housing so works with both, the AOD and C-6 both work with the 164 tooth.
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Old 10-10-2005, 10:25 AM
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Why swap?

I cannot see myself why one would want to get rid of the C-6. Just have that one rebuilt as they are good tough trannys..the one you have probably just wore out the clutches and such..

If I were to swap to anything it wuld be the AOD to get the overdrive if this is a street rig..

Dunno about this balance deal as I have a number of small block Ford trannies here and the balance weights are all welded to the flex plates and there is no evidence of any weights being added to the converters on any of them and I am holding the parts in my hand...

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Old 10-10-2005, 12:03 PM
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Your correct, Ford balances by the flexplate not the torque converter. All the C-6,FMX,AOD,C-4 will interchange with no problems what so ever. They all have the same bolt pattern for the converter.

The only difference is that some of the C-4's have a smaller bell housing and require a 157tooth flex plate or you can just change the bell housing to work with the 164 tooth.

Last edited by brainsboy; 10-10-2005 at 03:01 PM.
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Old 10-10-2005, 09:10 PM
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Old 10-10-2005, 10:49 PM
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Basically ANY C6 out of a 4wd pickup or big Bronco from 1987-1993 will work as long as the donor truck's engine is a 302/5.0, 351W/5.8, or 4.9/300 six cylinder. (Courtesy Hollander interchange manual) They all have the same bellhousing pattern and will bolt up to your transfer case just fine too.
Watch out for an AOD though, 5.0 trucks seemed to be evenly split between AOD's and C6's. Swapping in an AOD isn't a bad idea but you'll have to change enough stuff that the expense will likely equal the cost of rebuilding TWO C6's. Definitely shop around if you end up rebuilding your trans. You can indeed get one rebuilt quite reasonably, but you're not likely going to get a bottom dollar price from national chain shops. You can certainly save money by doing the trans change yourself. Rebuilding one is technical but the average guy can swap one in the driveway. Be sure to have a helper on hand when it comes time to drop/replace the transfer case and the transmission. Both are heavier than you think.
BTW, my daily driver is an '87 4.9 Bronco with a C6, and yes I have done all that myself. And rebuilt the engine too.
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