745 to 435

[thehemikid]

1964 D 100 225 6cyl 745 trans.

Was thinking of changing to a NP435 trans. My spare 10 spine 435 has long cracks down both sides of the case. Are there any 23 spline NP435's that have the same long pilot length & diameter that would work with a disc change?

[BigBlockTrucks]

The 23 spline 435 I have is about 4 inches longer than the 10 spline 435s that I have. I’m not sure what year the 23 spline is. The longer tail shaft housing is for use with a trans crossmember in the rear where as the cross member is under the bell housing on the 10 splines.

[712edf]

23 spline 435's was used from 1969 until 88ish.

I'm not sure how the cases differ, if any, between 10 & 23 versions.

So your 10 spline is good other than the cracked case?

Bucky

[thehemikid]

Thanks BigBlockTrucks.

If the 23 spine trans are ~4" longer than the 10 spine, and my 10 spline is ~1" longer than my 745 that came in the truck, that adds up to ~5" shorter drive shaft. Not to big a deal. Sound like the drive shaft angle could be then dealt with with the 23 trans mount and redo of bell mounts. Start'n to snow ball. lol

712edf,...88ish.

I've heard of a 86ish locally still in a truck but haven't got to see it yet to check on it's outside details.
On the case being cracked. Yes, best I remember, (was 33 yrs ago) was still driving it when I spotted the cracks. But wasn't to much longer after that I had my foot down and spun a rod bearing and pulled everything out.

[Kaegi]

wow never seen one cracked like tat. I would just braze or weld it up

[thehemikid]

Found some good info reading the "NP-540 trans" thread. swptln said in the thread... "I don't think you have a 23 spline 435 on a hydraulic bell? The 23 spline input is too short for a hydraulic bell housing."

Appears the pre 69, 10 spline hydraulic bells are longer. Makes sense now with the 10 spline 745 and 435 pilot's being so long.

[Hobcobble]

Part of the issue is that the 23 spline disc will not work with the hydraulic
clutch pressure plate. You cannot use a mechanical clutch pressure plate
on a hydraulic clutch truck to my knowledge. The throw out bearings
for 10 & 23 spline trannys are different too. Unless others know a way
around it...... I know of no feasible way to co-mingle 10 & 23 spline
trannys & clutch components.

[thehemikid]

Hobcobble, is it the OD of the spring cage of the 23 disc that wont clear the ID of the pressure plate's ring.

712edf, If I can't find a fairly local 10 spine 435 (may go with a shipped deal but not yet) I may go the welded route.
Both sides of my 435 are cracked.

[PwrWgnDrvr]

Ive welded a lot of cast but something structural like that seems rather risky.

[58pwrwgn]

Has anyone tried a 23 spline in hydro bell. And why wouldn't a 23 disc work with a hydro pressure plate. I was thinking of trying to put a np445 in place of the granny 435. But I may just replace the 360 with a efi 5.7 and find an aluminum bell. If I had a 23 spline clutch, pp and trow out,I might have tried a test fit by now.
Dodge makes an input bearing that fits the automatic hub register. this moves it back and should accommodate the shorter 23 spline input.
The throw out bearing is bigger on the 10. And the PP might be deeper.
What I thinking was either using a 23 spline clutch, the 10 spline PP and then press a sleeve into the T.O. to account for the smaller 23 spline input bearing shaft. Or if the length of the 23 spline input bearing shaft is right and T.O.in the right location for the fork to work. I would use all the 23 spline stuff and modify the fork.

[thehemikid]

Does anyone know if the pre 69 D300's had the 1.375" diameter 10 spline input shaft or the 1" diameter 10 spline input, or were both optional depending on /6 or V8?
I'm thinking the 1&1/2 ton truck had the 1.375" 10 spline.

[712edf]

My guess is that the 100/200 series trucks used the smaller diameter 10 spline input & the 300 & up used the larger diameter. But that is only my guess. I am more certain that the 500 & up trucks used the large input. I really have only dealt with NP540 speeds when it comes to larger trucks.

Bucky

[dodgeboykim]

My guess is that the 100/200 series trucks used the smaller diameter 10 spline input & the 300 & up used the larger diameter. But that is only my guess. I am more certain that the 500 & up trucks used the large input. I really have only dealt with NP540 speeds when it comes to larger trucks.

Bucky

400 series did use larger input. Have one in my shed.

[PwrWgnDrvr]

All the D/W300's I have use a 1" input, that is both 10 spline and 23 spline trucks. 400 and up all use the 1.375"

[thehemikid]

Thanks good info!

Do the 1965 D300's have the Parking brake on the trans?

[712edf]

I think so. Even some of the passenger cars had the parking brake on the transmission until 66 or so. Medium dutys probably kept them the longest. My 75 W600 has the parking brake on the transfer case.

Bucky

[BigBlockTrucks]

I have both an early 65 tranny here and a late 65 in my truck. Both are 435’s and neither have the brake on them.

[PwrWgnDrvr]

I have both an early 65 tranny here and a late 65 in my truck. Both are 435’s and neither have the brake on them.

Your trucks are not 300's. I don't recall a 61-68 6 lug dana 70 rear axle with parking brakes.

[thehemikid]

Can the 1&3/8" 10 spline input shaft be swapped with a 1" 10 spline input?
If so,... I figure the front input ball bearing ID may be different and would have to be changed too,
as long as the OD seat in the case was the same?

I called Novak to ask them this, Tech was a bit busy Friday.

[Kaegi]

Can the 1&3/8" 10 spline input shaft be swapped with a 1" 10 spline input?
If so,... I figure the front input ball bearing ID may be different and would have to be changed too,
as long as the OD seat in the case was the same?

I called Novak to ask them this, Tech was a bit busy Friday.

it should fit. probably need to swap bearing retainer and throw out as well.

at least some if not all W300s had the 1.375" input