I was in the scrapyard the ither day and i found a 92 4.9l 4x4 with a 5 speed o/d. I have a 1982 bronco with a 300 6 (4.9) and a c6 in it that i want to put a standard in, the truck the five speed is in has all parts of the transmission in it.

The only problen ive found is that i can go through every gear perfectly except for the overdrive. It just wont go in. This is while the trucjs sitting in the scrapyard not running btw.

So my question is what could be wronh with overdrive? Could ut be blown? Or something else? I dont know much about transmissions so thats why im asking if theres any way of diagnosing what it could be before i pull it iut of the truck

 

If it wasn't turning I would expect one or more gears to be hard to engage. These commonly show wear in the shifters and shift forks. Those are serviceable through the top cover. They usually don't have fifth gear synchro issues but it's possible. Get eveything including the pedals. I don't think they will bolt in but you will need to adapt the bronco pedals to the hydraulic clutch setup.

 

Also that is a Mazda built tranny with an extremely high first gear. Wont be much good for off roading.

 

That's what low range is for

 

So what you are saying is that as long as the scrapyard doesnt want an arm and a leg for the tranny, then it would most likely be worth it for me to pick it up with the pedal assembly and all the parts and get it fixed? I know you dont want to tell me a forsure answer because it very well could be screwed. But if its just the synchros or the forks worn out. Then it could be worth picking up?


Thanks for the replies

 

Exactly.

Plus, he's coming from a C6.

The C6 has a 2.46 1st gear whereas the Mazda has a 3.90, which is actually pretty decent.
No, it's not the 6.69 crawling 1st gear of the NP-435, but with low range, you'll have plenty.
For someone who's going from having no granny 1st to having no granny 1st, they'll never know what they're missing.

I had an SROD in mine for a long time (about 8 years) and it has a 3.25 1st gear, which is even higher than the Mazda. I also have a 3.00 rear end, so it's geared high on top of that. There wasn't anywhere I couldn't go.

Generally, low range + the 6.69 of the NP435 I have now is so incredibly low that I only save it for special occasions. Otherwise, it's so low it's near useless.


Just be sure to replace the plugs on the Mazda tranny with brass ones. They're design flaw is the stock plugs shrunk and cracked, which caused the transmission to leak fluid and burn up. I've never really heard any bad things about them otherwise.

-

 

Dont want to rain on anyones parade but you are gonna have to find an adapter for your transfer case off the c-6 to fit the M5od. Or vice versa. Having a 2 speed transfer case with a standard tranny is almost like having 2 transfer cases. Most standard trannies came with a single speed transfer case. Not all but most.

 

I'm confused as to what you're referring to. What's a single speed transfer case?

Starting in or around 1980, the 4x4 trucks had the NP208 transfer case. Somewhere in the 90s they switched to the BW1356. The two are interchangeable.
It didn't matter if you had an auto or a manual.

 

Can i not just get the transfer case out of the truck that has the tranny in it? As i said the truck with the 5 spd tranny in it has everything needed to do the swap, its the same engine as mine just efi and is all complete

 

I would think you could either do that or use the one you have now. You'll probably need to move the crossmember since the transmissions are more than likely different lengths, as well as different driveshaft lengths. But the transfer case simply bolts on to the tailshaft of the transmission.

 

I have found a 94 f150 about 2 hours away from me that i am hoping to pick up, it has a brand new box on it that i will put on my 250 and i will use the five speed transmission and transfer case out of it for my bronco, it is also a 4.9 4x4.

I am thinking this is the better way for me to go so that i have the truck at my house to do the swap directly from one truck to the other and then there is no chance of me forgetting to get something from the scrapyard, my plan is to get the longer driveshaft from the 150 shortened to fit on the bronco after i switch transmissions since iver heard that the driveshaft i have now will be too short after i swap trannys, is this true?

 

That sounds like that's a good way to go.
One thing I forgot about is that the f-series trucks and Broncos have different tail shafts on the transfer cases.

Check out my transmission swap pics for more info:

1981 Ford Bronco NP435 Swap pictures, videos, and sounds | SuperMotors.net

This is from a manual to a manual, but the two were so different that there are almost no different steps from an auto to a manual.

 

So is it neccesary to swap the tailshafts on the transfer cases if i am swapping the transfer case and tranny as a whole from one truck to another? If so can you explain why?
Thanks again, Pat

 

It's simply a different connection.

The truck has a splined shaft that comes out whereas the Bronco has a u-joint connection like on the differential. This is due to the super short driveshaft on the Bronco necessitating a double cardan joint. (Also why you can't use the truck's driveshaft on your Bronco.)

 

I didn't take a direct picture of it (I should have) but you can see the long splined shaft coming out of the transfer case in the top picture. The truck driveshaft connects right to this. The Bronco output shaft is the bottom picture.