Outer Limits 4x4 Board

Some of u guys may remember me, i put a 302 clevo in2 my swb mk last year, my 5 speed needs some work doing to it so i bought an mk patrol traytop 2day with a P40 in it, It has a 5 speed too, reading a post on this forum it says sd33 and p40 share the same bellhousing, does it anyone know if it also shares the shorter input shaft? Wanna put the traytop box in my patrol. Oh and i will be wreckin the traytop if any1 is after any bits.
Paul

um yeah, need a 5 speed box

Regards,
g@z.

If u wanna sort out me old box ur welcome

I put an SD33 (or SD33T) gearbox in my P40 some years ago. The input shafts were different. From memory I had to shorten the SD33 one and make a new pilot bush as the shaft was a slightly smaller diameter. My main mistake was to make the new pilot bush too tight. As soon as it warmed up on the test run it started to squeal and then baulked at an intersection - embarrassing. They don't have to be a tight fit as they don't take any load when the clutch is engaged.

David

That must mean there are 3 differant input size shafts, if u had 2 shorten an sd33 shaft to fit a P40 then obviously a p40 box has the shortest input shaft of them.

Demo2

That must mean there are 3 differant input size shafts, if u had 2 shorten an sd33 shaft to fit a P40 then obviously a p40 box has the shortest input shaft of them.

That makes sense. There was not a lot of difference between the P40 and SD33 but the L28 must be a shorter engine. From memory the difference is in the spigot which fits the pilot bush. Clutch splines etc. were the same. On the P40 4 speed box which is still sitting in my garage the spigot dia is 3/4" (it appears to be imperial - hangover from the Austin origins of the P40?) and 1-1/4"long. The total shaft length from the face of the gearbox to the end of the spigot is approx 7". The input shaft from the 4-speed was not interchangeable with the 5-speed as the 4 speed main gear had 27 teeth and the 5 speed 24 teeth.

I don't think it would be a big job to lengthen the P40 shaft and reduce its dia to fit the SD33 engine. A local engineering works shortened mine. You dont have to dismantle the gearbox to remove the input shaft - it just unbolts but be careful not to drop various spacers etc into the works!

I have just checked the parts book and yes there are 3 different part nos for "Gear - Main Drive" of the 5-speed. 32201-C8000 for the P40, 32201-C8010 for SD33 and SD33T and 32201-C8200 for the L28. All have 24 teeth on the main gear.

And yes it is definitely worth making the change from 4 to 5 speed.

David

I allready have 5 speed, it just needs some work doin to it. My Mk had an L28 originally b4 i put the V8 in it, used same input shaft as original. Have just bought an unlicensed tray top patrol which has a 5 speed box in it to rob 2 put in mine. But the tray top has a p40 motor, thats why i wondered if it used a differant input shaft on that 5 speed apposed to my 5 speed. SO it looks like it does. According to my nissan manuel, traytops never had the L28 fitted to them, was either sd33 or p40.

Demo2. You might be able to swap the input shafts over though this would mate previously unmated gears which may not be a good idea.

On a previous post on this topic http://www.outerlimits4x4.com/PHP_Modul ... 201#787201 I wrote

From the Parts Book it appears that there were two 5 speed boxes. One with ratios 3.897, 2.370, 1.440, 1.000, 0.825 (4.267 Rev) and the other 4.222, 2.370, 1.440, 1.000, 0.825 (4.622 Rev). The former was used as far as I can ascertain with the P40 and SD33T engines and the latter with the SD33 and L28. If you have the L28 engine it would seem preferable to find a L28 or SD33 box. I also note from the Parts Book that from August 1983 the four speed ratios were only fitted to the P40 and the L28, the P40 with the ratios 3.897, 2.370, 1.440, 1.000 and the L28 with ratios 4.222, 2.370, 1.440, 1.000.

which will probably just confuse you as it does me!!

My early Nissan manual shows the Pick-up using the P40, SD33 and L28 engines though the L28 may not have been available in Oz. This manual was issued prior to the SD33T coming out. A 1984 sales brochure I picked up in Australia and still have confirms that the Pickup was available in P40 and SD33 as standard with the SD33T available as an option. The L28 was not shown as an option.

Incidentally I have not come across the nomenclature MK. Was this a later MQ? I have always known the "MQ" as the Model 160 my hardtop being a K160 and the pickup being the U160. Various other letters were added to designate the engine, LHD or RHD, and wheelbase.

David

PS What are you doing with the distributor and inlet manifold off the P40?

i got a 5sp forsale if you want it

Someone who has just bought a G60 might be interested in exploring whether a P40 engine plus five-speed is a good bolt-in option to replace the predecessor P engine and three-speed, you never know.

If you did that you could possibly put the $$ toward a five-speed that doesn't need any machining etc to fit your vehicle.

Just an option to consider.

David, i aint doin nufin wiv em, was gonna advertise the pickup as wrecking once i got my mk sorted. SO if any1 wants any bits pm me, not ideal i know to mix shafts but will only be temporary until i've repaired my existin box. Just taken p40 5 speed box out and it is defo shorter and has a much bigger dia shaft where it goes into spigot bush.

David_S wrote: Incidentally I have not come across the nomenclature MK. Was this a later MQ? I have always known the "MQ" as the Model 160 my hardtop being a K160 and the pickup being the U160. Various other letters were added to designate the engine, LHD or RHD, and wheelbase.

David

PS What are you doing with the distributor and inlet manifold off the P40?

The MK is the later model MQ but with square headlights and other small changes.

Thanks MKPatrolGuy - now I know.

The top cover is differant too, the gearstick comes out further forward on the p40 box, swapped it over and then couldn't get 2nd gear, u have to swap the sliding part of the selector in the cover over. Oh and the linkage 4 the 4wd selector needsd swapping over.

The saga continues, the gear on my input shaft is buggered, a piece of broken metal from somewhere in the box and mashed up between the 2 gears and has scored it quiet badly. Now i need another input shaft

Any1 out there got an input shaft from an l28 5 spd box, ive rang all over the country and no1 has one.Failing that, i know the deisel shaft is shorter but are the splines in the same place for the clutch? Can any1 give me some dimensions of a diesel shaft etc. Car has been off the road for a month now and its drivin me nuts

Any1 out there got an input shaft from an l28 5 spd box, ive rang all over the country and no1 has one.Failing that, i know the deisel shaft is shorter but are the splines in the same place for the clutch? Can any1 give me some dimensions of a diesel shaft etc. Car has been off the road for a month now and its drivin me nuts

All back on the road again, many thanks 2 kingy for gettin me out of the shit by givin me an input shaft, which incedently is the same as a 4 speed box input shaft! Only thing rong wiv new box is when oil has warmed up, when u let the clutch up in 2nd 2 pull away it sometimes makes a clackin sound like something is loose, dosn't do it when cold and dosn't always do it when it's hot but mostly does. Oh well i can rebuild me old 5 spd now ready 2 drop back in when i do the 351 conversion.