Does anyone know if a np435 will bolt up to a 351W? How strong are np435s? Does anyone know what they came in originally? From what I understand it is a granny low(ratio?) with a 1:1 fourth gear.(?)
Thanks for any info.

Alex

 

I was told that the granny low is 6.69:1? How strong are these trannys, how much power can they handle? Thanks again.

 

[updated:LAST EDITED ON 21-Feb-02 AT 10:14 PM (EST)]> I was told that the granny low is 6.69:1? How strong are
>these trannys, how much power can they handle? Thanks again.

There are several different ratios for the NP435. Most are the 6.69:1. They have unsynchronized (granny low) 1st gear and reverse. Were found in Jeeps, Dodge, and Ford pick-ups/ Broncos from the early 60's until mid 80's. IMHO they are really strong trannies, but are subject to failure under extreme heavy continuous load. Then again what isn't? I've seen quite a few guys use these trannies for rock crawling projects.

They have a seperate bell housing for small blocks (289/300-6/302/351W) so if you pull one and don't have a bell housing for it make sure you pull that too. Also check the input shaft length, I believe they can vary as well.

-Kerry

 

Kerry, thanks a lot for the information, really helpful!!! I am planning on putting the tranny in my 90 Bronco 351W to replace the tall geared, too-expensive E40D that just went out for the second time. Plus, can't beat that granny low. Do you or anyone for that matter know whether or not an NP 205 will bolt up to an np435? I know that I will also have to shorten my front driveshaft and lengthen my rear for the swap too. Does anyone know what an np435 should cost, used or rebuilt? Also the cost of an np205? Thanks for any info.

Alex

 

I remember seeing somewhere here that they were rated to the mid 400's for torque.

 

The NP435 and NP205 are one of the strongest setups you'll find! I saw a review on several trannies and this setup was refered to as the King!

I'd expect to find them for sale in the $200~300 ea range. But they were made for many years, so you can save a few $$ by pulling one yourself from a self-serve type yard.


The 73-77.5 F250 4x4 has a seperate drive line from the tranny to the TC but several other setups have them together.

 

I believe that there might be a np-435\np-205 combo from a 78 f250 for sale on e-bay in the trucks-parts-transmissions for sale---check it out , fd :-X11

 

Your drive train geometry should be roughly the same as the 78-86, measure twice cut once. Start looking around the web and doing research with other 4 wheel owners (such as we are here
). If you have a lift you'll definitely need to get new drive shafts made.

I'd say use the mid-late 70's Ford trucks and Broncos(78-79) They should have the parts you need (non-divorced combos) and the Bronco will have roughly the same geometry as yours does now. The only difference I see is the 8.8" rear you have and the 9" that these donor vehicles will have. I've heard the yoke position is different on the 8.8 (I don't know I 've never owned an 8.8" rear end).

The most I'd pay for the combo is $800 in very good working order. I'd still tear them both down just to ease my mind.

If you have the cash spring for a rebuild for both. This way you know that the parts are newer, design flaws may be upgraded, and you may have strengthed it. I'd say that that could run you in upwards of $2500 with the purchase and rebuild for both (if you already have them torn out and will be putting them back in yourself).

-Kerry

 

Kerry thanks again for the thorough information. About the nine inch I was looking to swap one in anyways for the increased strength and availability of traction devices. Any other info is always appreciated. Thanks again.

Alex

 

90Bronc, what do you want for the E40D tranny?

 

the np435 is pretty stout! i see them used in pulling trucks that have 600-800 hp in front of them!


-nathan

 

RRL' 78, I haven't pulled it yet, but it only has 70,000 miles on it and it has a new torque converter and front pump, if that matters. It's the 2nd gear clutch pack that is slipping. About selling it I can get back to you on that later this week. Email???

Alex

 

OK kspilkinton you seem to be the know on this tranny so here's my question. I'm pulling my NP205 transfer case off my married NP435 and putting a ProFab in it's place for Truck Pulling. Now can I change out just the end Casting of the tranny for the Reguler end with seal for the mini driveshaft, Or should I just yank it as a unit and get a 2 Wheel Drive NP435 Tranny and save myself the headackes ..

ShaZam

 

ShaZam-

Sorry I came across like a know-it-all, but I have been finding out some info myself and thought I'd share with Alex.

As for what you're doing...

You should still be able to use your tranny, but you'd have to find a divorced combo anyway to get the output shaft end, seal, and yoke. The ProFab 205 will need a yoke on the input as well (probably come with it, but I don't know).

I don't know for sure but it seems that keeping the combo married may be a better bet. Less joints between the two = more strength, but if you need a lower drive shaft angle then I guess you'd have to drop the xfer case to get what you want.

I think the output end casting on the divorced combo was the same length as the 2wd unit, but don't quote me on that. A trip to a junk yard or friend's house may be in order.

Hope I helped you out, I've never built a puller before.

-Kerry

 

Oh I wasn't picking on you for being a know it all, I just look for someone who seems to know more then me and that was you on this question.

But Yes I know keeping it married would be stronger but I'm going for more versatitly, with the current NP205 I have in there I have but one gear to pull in Low range 2nd gear and I have 4.88 gears in my rearends, That gives me 19 MPH wheel speed at 7500 RPM's. And that's good on some tracks the real sticky ones, but in my pulling season I have 3 sticky tracks, 3 really loose tracks and 7 good tracks. I need the 4.88 gears on the sticky ones ,4.11 on the loose ones ,4.56 on the good ones, Hense comes the ProFab,and 3 set of gears of which can be changed in about 5 minutes for the track I'm running, I'll give up a little strength with one more drive shaft, for the convenances of quicker gear changes. Beside my other choice is getting 4.11's & 4.56 gears for my rearends and changing for the tracks.Where there are some pulls that I have a real loose track one night and a real sticky one the next day.